Bariatric Surgery

Despite an increasing rate of obesity in the United States, sleeve gastrectomy and postoperative antiobesity pharmacotherapy remain significantly underutilized, according to investigators.

A retrospective study involving almost 3 million adults with obesity found that only 0.94% had undergone sleeve gastrectomy, with 5.6% of those receiving weight-loss drugs after discharge, reported lead author Raj Shah, MD, of University Hospitals Cleveland Medical Center, and colleagues.

“While obesity has increased exponentially in the past decade, the trends of bariatric procedures and postoperative pharmacotherapy in this timeline is not well established,” the investigators wrote in an abstract released as part of the annual Digestive Disease Week, which was canceled because of COVID-19.

According to coauthor Abbinaya Elangovan, MD, of MetroHealth Medical Center, Cleveland, existing data suggest a practice gap.

“We know from published studies that antiobesity measures – both surgical and pharmacotherapeutic – do not match the rates of obesity,” Dr. Elangovan said. “We wanted to see how many of the morbidly obese [patients] who get bariatric surgery get started on antiobesity pharmacotherapy. We selected sleeve gastrectomy, as that is the most common bariatric procedure performed in the United States in recent times.”

The investigators began by retrospectively screening 2,717,000 individuals with a body mass index (in kg/m₂) of at least 40 who entered the IBM Explorys database from 2010 to 2019. Out of this group, 25,540 individuals (0.94%) had undergone sleeve gastrectomy. Annual rates of the procedure increased from 0.06% in 2010 to 0.4% in 2019 (P < .0001).

Of the 25,540 patients who underwent sleeve gastrectomy, 1,440 (5.6%) were prescribed antiobesity medication after surgery, with about half (47%) of these prescriptions written within a year. The most common medication was phentermine (66%), followed by bupropion/naltrexone (16%) and phentermine/topiramate (14.4%).

Dr. Elangovan said that the rates of surgery and antiobesity pharmacotherapy found in the study were “sparse” compared with rates of obesity.

“[Future studies need] to find the barriers to antiobesity pharmacotherapy,” Dr. Elangovan said. “We know from some of the published studies that there are differences in provider perceptions, as well as patient populations who get the therapy.”

The present analysis showed that women, African Americans, and patients with commercial insurance were significantly more likely to receive postoperative weight-loss medications than other patient subgroups.

“I think insurance could be a potential concern,” Dr. Elangovan said. “This has been shown previously in the literature.” She also suggested that women may be accessing obesity-related health care more often than men.

Discussing steps to improve interventions for patients with obesity, Dr. Elangovan emphasized the amount of data supporting antiobesity pharmacotherapy.

“We know from studies published so far that combining pharmacotherapy with behavioral modifications has a greater percentage of success, compared to behavioral modifications by themselves,” Dr. Elangovan said.

According to Dr. Elangovan, primary care providers play a key role in connecting obese patients with the treatments they need, requiring familiarity with existing guidelines.

“It helps if practicing clinicians, especially primary care providers, are familiar with bariatric surgery criteria and institution policies,” Dr. Elangovan said. “It has been shown in some studies that limited experience in prescribing and concern for adverse reactions could affect the prescription of antiobesity pharmacotherapy. Targeted interventions such as educational programs may increase the appropriate usage of medications.”

Dr. Smith disclosed a relationship with US Endoscopy.

SOURCE: Shah R et al. DDW 2020, Abstract 791.

Despite an increasing rate of obesity in the United States, sleeve gastrectomy and postoperative antiobesity pharmacotherapy remain significantly underutilized, according to investigators.

A retrospective study involving almost 3 million adults with obesity found that only 0.94% had undergone sleeve gastrectomy, with 5.6% of those receiving weight-loss drugs after discharge, reported lead author Raj Shah, MD, of University Hospitals Cleveland Medical Center, and colleagues.

“While obesity has increased exponentially in the past decade, the trends of bariatric procedures and postoperative pharmacotherapy in this timeline is not well established,” the investigators wrote in an abstract released as part of the annual Digestive Disease Week, which was canceled because of COVID-19.

According to coauthor Abbinaya Elangovan, MD, of MetroHealth Medical Center, Cleveland, existing data suggest a practice gap.

“We know from published studies that antiobesity measures – both surgical and pharmacotherapeutic – do not match the rates of obesity,” Dr. Elangovan said. “We wanted to see how many of the morbidly obese [patients] who get bariatric surgery get started on antiobesity pharmacotherapy. We selected sleeve gastrectomy, as that is the most common bariatric procedure performed in the United States in recent times.”

The investigators began by retrospectively screening 2,717,000 individuals with a body mass index (in kg/m₂) of at least 40 who entered the IBM Explorys database from 2010 to 2019. Out of this group, 25,540 individuals (0.94%) had undergone sleeve gastrectomy. Annual rates of the procedure increased from 0.06% in 2010 to 0.4% in 2019 (P < .0001).

Of the 25,540 patients who underwent sleeve gastrectomy, 1,440 (5.6%) were prescribed antiobesity medication after surgery, with about half (47%) of these prescriptions written within a year. The most common medication was phentermine (66%), followed by bupropion/naltrexone (16%) and phentermine/topiramate (14.4%).

Dr. Elangovan said that the rates of surgery and antiobesity pharmacotherapy found in the study were “sparse” compared with rates of obesity.

“[Future studies need] to find the barriers to antiobesity pharmacotherapy,” Dr. Elangovan said. “We know from some of the published studies that there are differences in provider perceptions, as well as patient populations who get the therapy.”

The present analysis showed that women, African Americans, and patients with commercial insurance were significantly more likely to receive postoperative weight-loss medications than other patient subgroups.

“I think insurance could be a potential concern,” Dr. Elangovan said. “This has been shown previously in the literature.” She also suggested that women may be accessing obesity-related health care more often than men.

Discussing steps to improve interventions for patients with obesity, Dr. Elangovan emphasized the amount of data supporting antiobesity pharmacotherapy.

“We know from studies published so far that combining pharmacotherapy with behavioral modifications has a greater percentage of success, compared to behavioral modifications by themselves,” Dr. Elangovan said.

According to Dr. Elangovan, primary care providers play a key role in connecting obese patients with the treatments they need, requiring familiarity with existing guidelines.

“It helps if practicing clinicians, especially primary care providers, are familiar with bariatric surgery criteria and institution policies,” Dr. Elangovan said. “It has been shown in some studies that limited experience in prescribing and concern for adverse reactions could affect the prescription of antiobesity pharmacotherapy. Targeted interventions such as educational programs may increase the appropriate usage of medications.”

Dr. Smith disclosed a relationship with US Endoscopy.

SOURCE: Shah R et al. DDW 2020, Abstract 791.

Despite an increasing rate of obesity in the United States, sleeve gastrectomy and postoperative antiobesity pharmacotherapy remain significantly underutilized, according to investigators.

A retrospective study involving almost 3 million adults with obesity found that only 0.94% had undergone sleeve gastrectomy, with 5.6% of those receiving weight-loss drugs after discharge, reported lead author Raj Shah, MD, of University Hospitals Cleveland Medical Center, and colleagues.

“While obesity has increased exponentially in the past decade, the trends of bariatric procedures and postoperative pharmacotherapy in this timeline is not well established,” the investigators wrote in an abstract released as part of the annual Digestive Disease Week, which was canceled because of COVID-19.

According to coauthor Abbinaya Elangovan, MD, of MetroHealth Medical Center, Cleveland, existing data suggest a practice gap.

“We know from published studies that antiobesity measures – both surgical and pharmacotherapeutic – do not match the rates of obesity,” Dr. Elangovan said. “We wanted to see how many of the morbidly obese [patients] who get bariatric surgery get started on antiobesity pharmacotherapy. We selected sleeve gastrectomy, as that is the most common bariatric procedure performed in the United States in recent times.”

The investigators began by retrospectively screening 2,717,000 individuals with a body mass index (in kg/m₂) of at least 40 who entered the IBM Explorys database from 2010 to 2019. Out of this group, 25,540 individuals (0.94%) had undergone sleeve gastrectomy. Annual rates of the procedure increased from 0.06% in 2010 to 0.4% in 2019 (P < .0001).

Of the 25,540 patients who underwent sleeve gastrectomy, 1,440 (5.6%) were prescribed antiobesity medication after surgery, with about half (47%) of these prescriptions written within a year. The most common medication was phentermine (66%), followed by bupropion/naltrexone (16%) and phentermine/topiramate (14.4%).

Dr. Elangovan said that the rates of surgery and antiobesity pharmacotherapy found in the study were “sparse” compared with rates of obesity.

“[Future studies need] to find the barriers to antiobesity pharmacotherapy,” Dr. Elangovan said. “We know from some of the published studies that there are differences in provider perceptions, as well as patient populations who get the therapy.”

The present analysis showed that women, African Americans, and patients with commercial insurance were significantly more likely to receive postoperative weight-loss medications than other patient subgroups.

“I think insurance could be a potential concern,” Dr. Elangovan said. “This has been shown previously in the literature.” She also suggested that women may be accessing obesity-related health care more often than men.

Discussing steps to improve interventions for patients with obesity, Dr. Elangovan emphasized the amount of data supporting antiobesity pharmacotherapy.

“We know from studies published so far that combining pharmacotherapy with behavioral modifications has a greater percentage of success, compared to behavioral modifications by themselves,” Dr. Elangovan said.

According to Dr. Elangovan, primary care providers play a key role in connecting obese patients with the treatments they need, requiring familiarity with existing guidelines.

“It helps if practicing clinicians, especially primary care providers, are familiar with bariatric surgery criteria and institution policies,” Dr. Elangovan said. “It has been shown in some studies that limited experience in prescribing and concern for adverse reactions could affect the prescription of antiobesity pharmacotherapy. Targeted interventions such as educational programs may increase the appropriate usage of medications.”

Dr. Smith disclosed a relationship with US Endoscopy.

SOURCE: Shah R et al. DDW 2020, Abstract 791.

The results of two postapproval studies confirm the potential risk of hyperinflation and acute pancreatitis with the Orbera and ReShape liquid-filled intragastric balloon systems used to treat obesity.

The Orbera Intragastric Balloon System is manufactured by Apollo Endosurgery. The ReShape Integrated Dual Balloon System was previously manufactured by ReShape Medical but was acquired by Apollo Endosurgery in December 2018.

In the Orbera postapproval study, 6 of 258 patients (2.3%) experienced balloon hyperinflation, the Food and Drug Administration said today in a letter to health care providers. There were no hyperinflation events detected in the ReShape postapproval study.

Acute pancreatitis was reported in 2 of 159 patients (1.3%) in the ReShape study, with no cases of acute pancreatitis reported in the Orbera study.

No balloon hyperinflation or acute pancreatitis events were reported in the studies the companies submitted to the FDA to gain approval, the agency said.

No deaths were reported in the postapproval studies, though the agency notes that the studies were not powered to detect. However, since Orbera and ReShape were approved in 2015, the FDA has learned of 18 deaths worldwide, including 8 patients in the United States (5 with Orbera and 3 with ReShape).

The FDA issued previous letters to health care providers concerning issues with these devices in June 2018, August 2017, and February 2017.

As of Jan. 1, 2019, Apollo Endosurgery stopped selling the ReShape Balloon. The Orbera balloon remains available.

“The FDA wants to ensure healthcare professionals are aware of the rates of these potential complications observed in the post-approval studies so they can discuss the risks and benefits of weight loss treatments with patients and monitor patients during treatment,” Benjamin Fisher, PhD, director of the Reproductive, Gastro-Renal, Urological, General Hospital Device, and Human Factors Office at the FDA’s Center for Devices and Radiological Health, said in a statement.

“While these devices remain an appropriate treatment option for some patients with obesity, patients should always discuss with their doctors which treatment option is best for them,” said Dr. Fisher.

A version of this article originally appeared on Medscape.com.

The results of two postapproval studies confirm the potential risk of hyperinflation and acute pancreatitis with the Orbera and ReShape liquid-filled intragastric balloon systems used to treat obesity.

The Orbera Intragastric Balloon System is manufactured by Apollo Endosurgery. The ReShape Integrated Dual Balloon System was previously manufactured by ReShape Medical but was acquired by Apollo Endosurgery in December 2018.

In the Orbera postapproval study, 6 of 258 patients (2.3%) experienced balloon hyperinflation, the Food and Drug Administration said today in a letter to health care providers. There were no hyperinflation events detected in the ReShape postapproval study.

Acute pancreatitis was reported in 2 of 159 patients (1.3%) in the ReShape study, with no cases of acute pancreatitis reported in the Orbera study.

No balloon hyperinflation or acute pancreatitis events were reported in the studies the companies submitted to the FDA to gain approval, the agency said.

No deaths were reported in the postapproval studies, though the agency notes that the studies were not powered to detect. However, since Orbera and ReShape were approved in 2015, the FDA has learned of 18 deaths worldwide, including 8 patients in the United States (5 with Orbera and 3 with ReShape).

The FDA issued previous letters to health care providers concerning issues with these devices in June 2018, August 2017, and February 2017.

As of Jan. 1, 2019, Apollo Endosurgery stopped selling the ReShape Balloon. The Orbera balloon remains available.

“The FDA wants to ensure healthcare professionals are aware of the rates of these potential complications observed in the post-approval studies so they can discuss the risks and benefits of weight loss treatments with patients and monitor patients during treatment,” Benjamin Fisher, PhD, director of the Reproductive, Gastro-Renal, Urological, General Hospital Device, and Human Factors Office at the FDA’s Center for Devices and Radiological Health, said in a statement.

“While these devices remain an appropriate treatment option for some patients with obesity, patients should always discuss with their doctors which treatment option is best for them,” said Dr. Fisher.

A version of this article originally appeared on Medscape.com.

The results of two postapproval studies confirm the potential risk of hyperinflation and acute pancreatitis with the Orbera and ReShape liquid-filled intragastric balloon systems used to treat obesity.

The Orbera Intragastric Balloon System is manufactured by Apollo Endosurgery. The ReShape Integrated Dual Balloon System was previously manufactured by ReShape Medical but was acquired by Apollo Endosurgery in December 2018.

In the Orbera postapproval study, 6 of 258 patients (2.3%) experienced balloon hyperinflation, the Food and Drug Administration said today in a letter to health care providers. There were no hyperinflation events detected in the ReShape postapproval study.

Acute pancreatitis was reported in 2 of 159 patients (1.3%) in the ReShape study, with no cases of acute pancreatitis reported in the Orbera study.

No balloon hyperinflation or acute pancreatitis events were reported in the studies the companies submitted to the FDA to gain approval, the agency said.

No deaths were reported in the postapproval studies, though the agency notes that the studies were not powered to detect. However, since Orbera and ReShape were approved in 2015, the FDA has learned of 18 deaths worldwide, including 8 patients in the United States (5 with Orbera and 3 with ReShape).

The FDA issued previous letters to health care providers concerning issues with these devices in June 2018, August 2017, and February 2017.

As of Jan. 1, 2019, Apollo Endosurgery stopped selling the ReShape Balloon. The Orbera balloon remains available.

“The FDA wants to ensure healthcare professionals are aware of the rates of these potential complications observed in the post-approval studies so they can discuss the risks and benefits of weight loss treatments with patients and monitor patients during treatment,” Benjamin Fisher, PhD, director of the Reproductive, Gastro-Renal, Urological, General Hospital Device, and Human Factors Office at the FDA’s Center for Devices and Radiological Health, said in a statement.

“While these devices remain an appropriate treatment option for some patients with obesity, patients should always discuss with their doctors which treatment option is best for them,” said Dr. Fisher.

A version of this article originally appeared on Medscape.com.

People with diabetes may benefit less from bariatric surgery, compared with those without the disease, according to a retrospective review of patients receiving both sleeve gastrectomy and gastric bypass.

The difference was particularly pronounced and persistent for patients who had gastric bypass, Yingying Luo, MD, said during a virtual news conference held by the Endocrine Society. The study was slated for presentation during ENDO 2020, the society’s annual meeting, which was canceled because of the COVID-19 pandemic.

“Our findings demonstrated that having bariatric surgery before developing diabetes may result in greater weight loss from the surgery, especially within the first 3 years after surgery and in patients undergoing gastric bypass surgery,” said Dr. Luo.

More than a third of U.S. adults have obesity, and more than half the population is overweight or has obesity, said Dr. Luo, citing data from the Centers for Disease Control and Prevention.

Bariatric surgery not only reduces body weight, but also “can lead to remission of many metabolic disorders, including diabetes, hypertension, and dyslipidemia,” said Dr. Luo, a visiting scholar at the University of Michigan’s division of metabolism, endocrinology, and diabetes. However, until now, it has not been known how diabetes interacts with bariatric surgery to affect weight loss outcomes.

To address that question, Dr. Luo and her colleagues looked at patients in the Michigan Bariatric Surgery Cohort who were at least 18 years old and had a body mass index (BMI) of more than 40 kg/m², or of more than 35 kg/m² with comorbidities.

The researchers followed 380 patients who received gastric bypass and 334 who received sleeve gastrectomy for at least 5 years. Over time, sleeve gastrectomy became the predominant type of surgery conducted, noted Dr. Luo.

At baseline, and yearly for 5 years thereafter, the researchers recorded participants’ BMI as well as their lipid levels and other laboratory values. Medication use was also tracked. Patients with a diagnosis of diabetes also had their hemoglobin A_1c levels recorded at each visit.

Overall, patients in the sleeve gastrectomy group were more overweight, and those in the gastric bypass group had higher HbA_1c and total cholesterol levels. The mean baseline weight for the sleeve gastrectomy recipients was 141.5 kg, compared with 133.5 kg for those receiving gastric bypass (BMI, 49.9 vs. 47.3 kg/m², respectively; P < .01 for both measures). Mean HbA_1c was 6.5% for the gastric bypass group, compared with 6.3% for the sleeve gastrectomy group (P = .03).

At baseline, 149 (39.2%) of the gastric bypass patients had diabetes, compared with 108 (32.3%) of the sleeve gastrectomy patients, but the difference was not statistically significant.

About two-thirds of the full cohort were tracked for at least 5 years, which is still considered “a good follow-up rate in a real-world study,” said Dr. Luo.

Total weight loss was defined as the difference between initial weight and postoperative weight at a given point in time. Excess weight was the difference between initial weight and an individual’s ideal weight, that is, what their weight would have been if they had a BMI of 25 kg/m².

“The probability of achieving a BMI of less than 30 kg/m² or excess weight loss of 50% or more was higher in patients who did not have diabetes diagnosis at baseline. We found that the presence of diabetes at baseline substantially impacted the probability of achieving both indicators,” said Dr. Luo. “Individuals without diabetes had a 1.5 times higher chance of achieving a BMI of under 30 kg/m², and … [they also] had a 1.6 times higher chance of achieving excess body weight loss of 50%, or more.” Both of those differences were statistically significant on univariate analysis (P = .0249 and .0021, respectively).

The researchers conducted further statistical analysis – adjusted for age, gender, surgery type, and baseline weight – to examine whether diabetes still predicted future weight loss after bariatric surgery. After those adjustments, they still found that “the presence of diabetes before surgery is an indicator of future weight loss outcomes,” said Dr. Luo.

The differences in outcomes for those with and without diabetes tended to diminish over time in looking at the cohort as a whole. However, greater BMI reduction for those without diabetes persisted for the full 5 years of follow-up for the gastric bypass recipients. Those trends held when the researchers looked at the proportion of patients whose BMI dropped to below 30 kg/m², and those who achieved excess weight loss of more than 50%.

Dr. Luo acknowledged that an ideal study would track patients for longer than 5 years and that studies involving more patients would also be useful. Still, she said, “our study opens the door for further research to understand why diabetes diminishes the weight loss effect of bariatric surgery.”

The research will be published in a special supplemental issue of the Journal of the Endocrine Society. In addition to a series of news conferences on March 30-31, the society will host ENDO Online 2020 during June 8-22, which will present programming for clinicians and researchers.

Dr. Luo reported no outside sources of funding and no conflicts of interest.
 

SOURCE: Luo Y et al. ENDO 2020, Abstract 590.

People with diabetes may benefit less from bariatric surgery, compared with those without the disease, according to a retrospective review of patients receiving both sleeve gastrectomy and gastric bypass.

The difference was particularly pronounced and persistent for patients who had gastric bypass, Yingying Luo, MD, said during a virtual news conference held by the Endocrine Society. The study was slated for presentation during ENDO 2020, the society’s annual meeting, which was canceled because of the COVID-19 pandemic.

“Our findings demonstrated that having bariatric surgery before developing diabetes may result in greater weight loss from the surgery, especially within the first 3 years after surgery and in patients undergoing gastric bypass surgery,” said Dr. Luo.

More than a third of U.S. adults have obesity, and more than half the population is overweight or has obesity, said Dr. Luo, citing data from the Centers for Disease Control and Prevention.

Bariatric surgery not only reduces body weight, but also “can lead to remission of many metabolic disorders, including diabetes, hypertension, and dyslipidemia,” said Dr. Luo, a visiting scholar at the University of Michigan’s division of metabolism, endocrinology, and diabetes. However, until now, it has not been known how diabetes interacts with bariatric surgery to affect weight loss outcomes.

To address that question, Dr. Luo and her colleagues looked at patients in the Michigan Bariatric Surgery Cohort who were at least 18 years old and had a body mass index (BMI) of more than 40 kg/m², or of more than 35 kg/m² with comorbidities.

The researchers followed 380 patients who received gastric bypass and 334 who received sleeve gastrectomy for at least 5 years. Over time, sleeve gastrectomy became the predominant type of surgery conducted, noted Dr. Luo.

At baseline, and yearly for 5 years thereafter, the researchers recorded participants’ BMI as well as their lipid levels and other laboratory values. Medication use was also tracked. Patients with a diagnosis of diabetes also had their hemoglobin A_1c levels recorded at each visit.

Overall, patients in the sleeve gastrectomy group were more overweight, and those in the gastric bypass group had higher HbA_1c and total cholesterol levels. The mean baseline weight for the sleeve gastrectomy recipients was 141.5 kg, compared with 133.5 kg for those receiving gastric bypass (BMI, 49.9 vs. 47.3 kg/m², respectively; P < .01 for both measures). Mean HbA_1c was 6.5% for the gastric bypass group, compared with 6.3% for the sleeve gastrectomy group (P = .03).

At baseline, 149 (39.2%) of the gastric bypass patients had diabetes, compared with 108 (32.3%) of the sleeve gastrectomy patients, but the difference was not statistically significant.

About two-thirds of the full cohort were tracked for at least 5 years, which is still considered “a good follow-up rate in a real-world study,” said Dr. Luo.

Total weight loss was defined as the difference between initial weight and postoperative weight at a given point in time. Excess weight was the difference between initial weight and an individual’s ideal weight, that is, what their weight would have been if they had a BMI of 25 kg/m².

“The probability of achieving a BMI of less than 30 kg/m² or excess weight loss of 50% or more was higher in patients who did not have diabetes diagnosis at baseline. We found that the presence of diabetes at baseline substantially impacted the probability of achieving both indicators,” said Dr. Luo. “Individuals without diabetes had a 1.5 times higher chance of achieving a BMI of under 30 kg/m², and … [they also] had a 1.6 times higher chance of achieving excess body weight loss of 50%, or more.” Both of those differences were statistically significant on univariate analysis (P = .0249 and .0021, respectively).

The researchers conducted further statistical analysis – adjusted for age, gender, surgery type, and baseline weight – to examine whether diabetes still predicted future weight loss after bariatric surgery. After those adjustments, they still found that “the presence of diabetes before surgery is an indicator of future weight loss outcomes,” said Dr. Luo.

The differences in outcomes for those with and without diabetes tended to diminish over time in looking at the cohort as a whole. However, greater BMI reduction for those without diabetes persisted for the full 5 years of follow-up for the gastric bypass recipients. Those trends held when the researchers looked at the proportion of patients whose BMI dropped to below 30 kg/m², and those who achieved excess weight loss of more than 50%.

Dr. Luo acknowledged that an ideal study would track patients for longer than 5 years and that studies involving more patients would also be useful. Still, she said, “our study opens the door for further research to understand why diabetes diminishes the weight loss effect of bariatric surgery.”

The research will be published in a special supplemental issue of the Journal of the Endocrine Society. In addition to a series of news conferences on March 30-31, the society will host ENDO Online 2020 during June 8-22, which will present programming for clinicians and researchers.

Dr. Luo reported no outside sources of funding and no conflicts of interest.
 

SOURCE: Luo Y et al. ENDO 2020, Abstract 590.

People with diabetes may benefit less from bariatric surgery, compared with those without the disease, according to a retrospective review of patients receiving both sleeve gastrectomy and gastric bypass.

The difference was particularly pronounced and persistent for patients who had gastric bypass, Yingying Luo, MD, said during a virtual news conference held by the Endocrine Society. The study was slated for presentation during ENDO 2020, the society’s annual meeting, which was canceled because of the COVID-19 pandemic.

“Our findings demonstrated that having bariatric surgery before developing diabetes may result in greater weight loss from the surgery, especially within the first 3 years after surgery and in patients undergoing gastric bypass surgery,” said Dr. Luo.

More than a third of U.S. adults have obesity, and more than half the population is overweight or has obesity, said Dr. Luo, citing data from the Centers for Disease Control and Prevention.

Bariatric surgery not only reduces body weight, but also “can lead to remission of many metabolic disorders, including diabetes, hypertension, and dyslipidemia,” said Dr. Luo, a visiting scholar at the University of Michigan’s division of metabolism, endocrinology, and diabetes. However, until now, it has not been known how diabetes interacts with bariatric surgery to affect weight loss outcomes.

To address that question, Dr. Luo and her colleagues looked at patients in the Michigan Bariatric Surgery Cohort who were at least 18 years old and had a body mass index (BMI) of more than 40 kg/m², or of more than 35 kg/m² with comorbidities.

The researchers followed 380 patients who received gastric bypass and 334 who received sleeve gastrectomy for at least 5 years. Over time, sleeve gastrectomy became the predominant type of surgery conducted, noted Dr. Luo.

At baseline, and yearly for 5 years thereafter, the researchers recorded participants’ BMI as well as their lipid levels and other laboratory values. Medication use was also tracked. Patients with a diagnosis of diabetes also had their hemoglobin A_1c levels recorded at each visit.

Overall, patients in the sleeve gastrectomy group were more overweight, and those in the gastric bypass group had higher HbA_1c and total cholesterol levels. The mean baseline weight for the sleeve gastrectomy recipients was 141.5 kg, compared with 133.5 kg for those receiving gastric bypass (BMI, 49.9 vs. 47.3 kg/m², respectively; P < .01 for both measures). Mean HbA_1c was 6.5% for the gastric bypass group, compared with 6.3% for the sleeve gastrectomy group (P = .03).

At baseline, 149 (39.2%) of the gastric bypass patients had diabetes, compared with 108 (32.3%) of the sleeve gastrectomy patients, but the difference was not statistically significant.

About two-thirds of the full cohort were tracked for at least 5 years, which is still considered “a good follow-up rate in a real-world study,” said Dr. Luo.

Total weight loss was defined as the difference between initial weight and postoperative weight at a given point in time. Excess weight was the difference between initial weight and an individual’s ideal weight, that is, what their weight would have been if they had a BMI of 25 kg/m².

“The probability of achieving a BMI of less than 30 kg/m² or excess weight loss of 50% or more was higher in patients who did not have diabetes diagnosis at baseline. We found that the presence of diabetes at baseline substantially impacted the probability of achieving both indicators,” said Dr. Luo. “Individuals without diabetes had a 1.5 times higher chance of achieving a BMI of under 30 kg/m², and … [they also] had a 1.6 times higher chance of achieving excess body weight loss of 50%, or more.” Both of those differences were statistically significant on univariate analysis (P = .0249 and .0021, respectively).

The researchers conducted further statistical analysis – adjusted for age, gender, surgery type, and baseline weight – to examine whether diabetes still predicted future weight loss after bariatric surgery. After those adjustments, they still found that “the presence of diabetes before surgery is an indicator of future weight loss outcomes,” said Dr. Luo.

The differences in outcomes for those with and without diabetes tended to diminish over time in looking at the cohort as a whole. However, greater BMI reduction for those without diabetes persisted for the full 5 years of follow-up for the gastric bypass recipients. Those trends held when the researchers looked at the proportion of patients whose BMI dropped to below 30 kg/m², and those who achieved excess weight loss of more than 50%.

Dr. Luo acknowledged that an ideal study would track patients for longer than 5 years and that studies involving more patients would also be useful. Still, she said, “our study opens the door for further research to understand why diabetes diminishes the weight loss effect of bariatric surgery.”

The research will be published in a special supplemental issue of the Journal of the Endocrine Society. In addition to a series of news conferences on March 30-31, the society will host ENDO Online 2020 during June 8-22, which will present programming for clinicians and researchers.

Dr. Luo reported no outside sources of funding and no conflicts of interest.
 

SOURCE: Luo Y et al. ENDO 2020, Abstract 590.

Bariatric surgery was associated with a significant reduction in the risk of colorectal cancer among obese adults in a retrospective study of more than 1 million individuals.

Although some studies have suggested that bariatric surgery may reduce the risk of obesity-associated cancers, such as colorectal cancer, other studies have shown an increased colorectal cancer risk after surgery, according to Laurent Bailly, MD, of Université Côte d’Azur in Nice, France, and colleagues.

In a study published in JAMA Surgery, Dr. Bailly and colleagues compared the incidence of colorectal cancer in obese patients who underwent bariatric surgery with the incidence in obese patients who did not have surgery and the incidence in the general population.

Using the French National Health Insurance Information System database, the researchers identified 1,045,348 obese adults aged 50-75 years who had no colorectal cancer at baseline. Of these patients, 74,131 underwent bariatric surgery and 971,217 did not. The mean age was 57.3 years in the surgery group and 63.4 years in the nonsurgery group.

The mean follow-up period was 6.2 years for patients who underwent adjustable gastric banding, 5.5 years for those with sleeve gastrectomy, 5.7 years for those who underwent gastric bypass, and 5.3 years for the nonsurgery group.
 

Results

Overall, the colorectal cancer rate was 0.6% in the surgery group and 1.3% in the nonsurgery group (P < .001).

The researchers calculated standardized incidence ratios (SIRs) to compare the risk of colorectal cancer in the study population with the risk among the French general population; in other words, the number of observed colorectal cancer cases divided by the number of expected cases.

In the surgery group, 423 cases of colorectal cancer were observed and 428 cases were expected, which leads to an SIR of 1.0. In the nonsurgery group, 12,629 cases were observed and 9,417 cases were expected, leading to an SIR of 1.34.

These results suggest patients in the nonsurgery group had a 34% higher risk of colorectal cancer compared with the general population, whereas the risk in the surgery group was similar to that in the general population.

Patients who underwent either gastric bypass or sleeve gastrectomy had fewer new colorectal cancer diagnoses (0.5% for both) compared with patients who had adjustable gastric banding (0.7%).

The researchers noted that this study was limited by several factors, including the retrospective, observational design and potential selection bias among surgery patients. However, the results were strengthened by the large study population and long-term follow-up.
 

Putting results into context

The authors of an invited commentary noted that this study is supported by results from a retrospective, U.S.-based study, which indicated that bariatric surgery has a “protective effect” against colorectal cancer (Ann Surg. 2019 Jan;269[1]:95-101).

However, these results conflict with other retrospective studies. A study of Nordic patients suggested that bariatric surgery is associated with an increased risk of colon cancer but perhaps not rectal cancer (Int J Cancer. 2019. doi: 10.1002/ijc.32770).

And a study of English patients showed an increased risk of colorectal cancer in patients who underwent gastric bypass but not in those who underwent gastric banding or sleeve gastrectomy (Br J Surg. 2018;105(12):1650-7).

These conflicting results “imply that the jury is still out on whether bariatric surgery increases or decreases” the risk of colorectal cancer, the commentators wrote. They added that future studies “must account for differences in study population (i.e., race/ethnicity and national origin), mechanistic variation in bariatric surgical type, and length of follow-up, while also distinguishing between rectal and colon cancer before the case is settled.”

This study had no outside sponsorship, and the researchers and commentators had no financial conflicts to disclose.

SOURCE: Bailly L et al. JAMA Surg. 2020 Mar 11. doi:10.1001/jamasurg.2020.0089; Davidson LE et al. JAMA Surg. 2020 Mar. 11. doi:10.1001/jamasurg.2020.0090.

Bariatric surgery was associated with a significant reduction in the risk of colorectal cancer among obese adults in a retrospective study of more than 1 million individuals.

Although some studies have suggested that bariatric surgery may reduce the risk of obesity-associated cancers, such as colorectal cancer, other studies have shown an increased colorectal cancer risk after surgery, according to Laurent Bailly, MD, of Université Côte d’Azur in Nice, France, and colleagues.

In a study published in JAMA Surgery, Dr. Bailly and colleagues compared the incidence of colorectal cancer in obese patients who underwent bariatric surgery with the incidence in obese patients who did not have surgery and the incidence in the general population.

Using the French National Health Insurance Information System database, the researchers identified 1,045,348 obese adults aged 50-75 years who had no colorectal cancer at baseline. Of these patients, 74,131 underwent bariatric surgery and 971,217 did not. The mean age was 57.3 years in the surgery group and 63.4 years in the nonsurgery group.

The mean follow-up period was 6.2 years for patients who underwent adjustable gastric banding, 5.5 years for those with sleeve gastrectomy, 5.7 years for those who underwent gastric bypass, and 5.3 years for the nonsurgery group.
 

Results

Overall, the colorectal cancer rate was 0.6% in the surgery group and 1.3% in the nonsurgery group (P < .001).

The researchers calculated standardized incidence ratios (SIRs) to compare the risk of colorectal cancer in the study population with the risk among the French general population; in other words, the number of observed colorectal cancer cases divided by the number of expected cases.

In the surgery group, 423 cases of colorectal cancer were observed and 428 cases were expected, which leads to an SIR of 1.0. In the nonsurgery group, 12,629 cases were observed and 9,417 cases were expected, leading to an SIR of 1.34.

These results suggest patients in the nonsurgery group had a 34% higher risk of colorectal cancer compared with the general population, whereas the risk in the surgery group was similar to that in the general population.

Patients who underwent either gastric bypass or sleeve gastrectomy had fewer new colorectal cancer diagnoses (0.5% for both) compared with patients who had adjustable gastric banding (0.7%).

The researchers noted that this study was limited by several factors, including the retrospective, observational design and potential selection bias among surgery patients. However, the results were strengthened by the large study population and long-term follow-up.
 

Putting results into context

The authors of an invited commentary noted that this study is supported by results from a retrospective, U.S.-based study, which indicated that bariatric surgery has a “protective effect” against colorectal cancer (Ann Surg. 2019 Jan;269[1]:95-101).

However, these results conflict with other retrospective studies. A study of Nordic patients suggested that bariatric surgery is associated with an increased risk of colon cancer but perhaps not rectal cancer (Int J Cancer. 2019. doi: 10.1002/ijc.32770).

And a study of English patients showed an increased risk of colorectal cancer in patients who underwent gastric bypass but not in those who underwent gastric banding or sleeve gastrectomy (Br J Surg. 2018;105(12):1650-7).

These conflicting results “imply that the jury is still out on whether bariatric surgery increases or decreases” the risk of colorectal cancer, the commentators wrote. They added that future studies “must account for differences in study population (i.e., race/ethnicity and national origin), mechanistic variation in bariatric surgical type, and length of follow-up, while also distinguishing between rectal and colon cancer before the case is settled.”

This study had no outside sponsorship, and the researchers and commentators had no financial conflicts to disclose.

SOURCE: Bailly L et al. JAMA Surg. 2020 Mar 11. doi:10.1001/jamasurg.2020.0089; Davidson LE et al. JAMA Surg. 2020 Mar. 11. doi:10.1001/jamasurg.2020.0090.

Bariatric surgery was associated with a significant reduction in the risk of colorectal cancer among obese adults in a retrospective study of more than 1 million individuals.

Although some studies have suggested that bariatric surgery may reduce the risk of obesity-associated cancers, such as colorectal cancer, other studies have shown an increased colorectal cancer risk after surgery, according to Laurent Bailly, MD, of Université Côte d’Azur in Nice, France, and colleagues.

In a study published in JAMA Surgery, Dr. Bailly and colleagues compared the incidence of colorectal cancer in obese patients who underwent bariatric surgery with the incidence in obese patients who did not have surgery and the incidence in the general population.

Using the French National Health Insurance Information System database, the researchers identified 1,045,348 obese adults aged 50-75 years who had no colorectal cancer at baseline. Of these patients, 74,131 underwent bariatric surgery and 971,217 did not. The mean age was 57.3 years in the surgery group and 63.4 years in the nonsurgery group.

The mean follow-up period was 6.2 years for patients who underwent adjustable gastric banding, 5.5 years for those with sleeve gastrectomy, 5.7 years for those who underwent gastric bypass, and 5.3 years for the nonsurgery group.
 

Results

Overall, the colorectal cancer rate was 0.6% in the surgery group and 1.3% in the nonsurgery group (P < .001).

The researchers calculated standardized incidence ratios (SIRs) to compare the risk of colorectal cancer in the study population with the risk among the French general population; in other words, the number of observed colorectal cancer cases divided by the number of expected cases.

In the surgery group, 423 cases of colorectal cancer were observed and 428 cases were expected, which leads to an SIR of 1.0. In the nonsurgery group, 12,629 cases were observed and 9,417 cases were expected, leading to an SIR of 1.34.

These results suggest patients in the nonsurgery group had a 34% higher risk of colorectal cancer compared with the general population, whereas the risk in the surgery group was similar to that in the general population.

Patients who underwent either gastric bypass or sleeve gastrectomy had fewer new colorectal cancer diagnoses (0.5% for both) compared with patients who had adjustable gastric banding (0.7%).

The researchers noted that this study was limited by several factors, including the retrospective, observational design and potential selection bias among surgery patients. However, the results were strengthened by the large study population and long-term follow-up.
 

Putting results into context

The authors of an invited commentary noted that this study is supported by results from a retrospective, U.S.-based study, which indicated that bariatric surgery has a “protective effect” against colorectal cancer (Ann Surg. 2019 Jan;269[1]:95-101).

However, these results conflict with other retrospective studies. A study of Nordic patients suggested that bariatric surgery is associated with an increased risk of colon cancer but perhaps not rectal cancer (Int J Cancer. 2019. doi: 10.1002/ijc.32770).

And a study of English patients showed an increased risk of colorectal cancer in patients who underwent gastric bypass but not in those who underwent gastric banding or sleeve gastrectomy (Br J Surg. 2018;105(12):1650-7).

These conflicting results “imply that the jury is still out on whether bariatric surgery increases or decreases” the risk of colorectal cancer, the commentators wrote. They added that future studies “must account for differences in study population (i.e., race/ethnicity and national origin), mechanistic variation in bariatric surgical type, and length of follow-up, while also distinguishing between rectal and colon cancer before the case is settled.”

This study had no outside sponsorship, and the researchers and commentators had no financial conflicts to disclose.

SOURCE: Bailly L et al. JAMA Surg. 2020 Mar 11. doi:10.1001/jamasurg.2020.0089; Davidson LE et al. JAMA Surg. 2020 Mar. 11. doi:10.1001/jamasurg.2020.0090.

Patients with type 2 diabetes who underwent Roux-en-Y gastric bypass (RYGB) surgery experienced higher rates of diabetes remission, improved glycemic control, greater weight loss, and fewer diabetes relapse events, compared with those who had sleeve gastrectomy, according to findings from nearly 10,000 patients.

“Remission of type 2 diabetes is common after bariatric surgery and may reduce risk for subsequent microvascular and macrovascular disease,” but it is not clear which of the two most common procedures, RYGB or sleeve gastrectomy, has better long-term diabetes and weight outcomes, wrote Kathleen M. McTigue, MD, of the University of Pittsburgh, and colleagues in JAMA Surgery.

To examine the effectiveness of the two procedures, the researchers identified 9,710 adults with type 2 diabetes who were part of the National Patient-Centered Clinical Research Network Bariatric Study. They compared diabetes outcomes for up to 5 years after surgery for 6,233 patients who underwent RYGB and 3,477 who underwent sleeve gastrectomy. The average age of the patients was 50 years, and 73% were women. The average preoperative body mass index was 49 kg/m².

Overall, 6,141 patients experienced diabetes remission. The estimated adjusted cumulative remission rates for the RYGB and sleeve gastrectomy groups after 1 year were 59% and 56%, respectively, and after 5 years were 86% and 84%.

Weight loss was significantly greater in RYGB patients, compared with those who had the sleeve gastrectomy, with average differences in percentage points of 6.3 at 1 year and 8.1 at year 5. RYGB patients also showed significantly better long-term glycemic control, compared with sleeve gastrectomy patients. At 5 years, hemoglobin A_1c levels were 0.80 percentage points below baseline in the RYGB group, and 0.35 percentage points below baseline in the sleeve gastrectomy group.

In addition, after 1 year, diabetes relapse rates in the RYGB and sleeve gastrectomy groups were 8% and 11%, respectively, and 33% and 42% after 5 years.

The findings were limited by several factors, including the observational design of the study and the potential for confounding and coding inaccuracies, the researchers noted, adding that future studies should address the impact of weight loss on diabetes remission and relapse in bariatric surgery patients.

They also noted that their results were in contrast to findings in previous studies that established no significant differences in outcomes between the procedures, but emphasized that most previous studies were smaller and controlled and that outcome differences may be greater in clinical practice.

“For patients, clinicians, and policy makers to make informed decisions about which procedure is best suited to patients’ personal situations, additional data are needed to understand the adverse event profile of the procedures, as well as patient values regarding procedure choice and the role of surgery relative to other aspects of lifelong weight management,” they concluded.

In an accompanying commentary, Natalie Liu, MD, and Luke M. Funk, MD, of the department of surgery, University of Wisconsin–Madison, said the analysis made an important contribution to the existing literature, despite its limitations.

“It included long-term electronic health record data from a large cohort of U.S. patients who had bariatric surgery in a real-world setting,” they wrote, adding that, although the remission rates were high, the relapse rate in both treatment groups deserved further study.

Dr. Liu and Dr. Funk emphasized that the overall high remission rates for either surgery, compared with lifestyle interventions, suggest the need for continued advocacy for better insurance coverage of, and access to, bariatric surgery procedures for patients with type 2 diabetes, notably those with class 1 obesity.

The study was conducted using the National Patient-Centered Clinical Research Network, which was funded by the Patient-Centered Outcomes Research Institute. Dr. McTigue and Dr. Liu had reported no conflicts of interest. Dr. Funk disclosed a Veterans Affairs Health Services Research & Development Career Development Award, and grants from the VA, National Institutes of Health, and American College of Surgeons.

SOURCES: McTigue KM et al. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0087; Lui N, Funk LM. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0088.

Patients with type 2 diabetes who underwent Roux-en-Y gastric bypass (RYGB) surgery experienced higher rates of diabetes remission, improved glycemic control, greater weight loss, and fewer diabetes relapse events, compared with those who had sleeve gastrectomy, according to findings from nearly 10,000 patients.

“Remission of type 2 diabetes is common after bariatric surgery and may reduce risk for subsequent microvascular and macrovascular disease,” but it is not clear which of the two most common procedures, RYGB or sleeve gastrectomy, has better long-term diabetes and weight outcomes, wrote Kathleen M. McTigue, MD, of the University of Pittsburgh, and colleagues in JAMA Surgery.

To examine the effectiveness of the two procedures, the researchers identified 9,710 adults with type 2 diabetes who were part of the National Patient-Centered Clinical Research Network Bariatric Study. They compared diabetes outcomes for up to 5 years after surgery for 6,233 patients who underwent RYGB and 3,477 who underwent sleeve gastrectomy. The average age of the patients was 50 years, and 73% were women. The average preoperative body mass index was 49 kg/m².

Overall, 6,141 patients experienced diabetes remission. The estimated adjusted cumulative remission rates for the RYGB and sleeve gastrectomy groups after 1 year were 59% and 56%, respectively, and after 5 years were 86% and 84%.

Weight loss was significantly greater in RYGB patients, compared with those who had the sleeve gastrectomy, with average differences in percentage points of 6.3 at 1 year and 8.1 at year 5. RYGB patients also showed significantly better long-term glycemic control, compared with sleeve gastrectomy patients. At 5 years, hemoglobin A_1c levels were 0.80 percentage points below baseline in the RYGB group, and 0.35 percentage points below baseline in the sleeve gastrectomy group.

In addition, after 1 year, diabetes relapse rates in the RYGB and sleeve gastrectomy groups were 8% and 11%, respectively, and 33% and 42% after 5 years.

The findings were limited by several factors, including the observational design of the study and the potential for confounding and coding inaccuracies, the researchers noted, adding that future studies should address the impact of weight loss on diabetes remission and relapse in bariatric surgery patients.

They also noted that their results were in contrast to findings in previous studies that established no significant differences in outcomes between the procedures, but emphasized that most previous studies were smaller and controlled and that outcome differences may be greater in clinical practice.

“For patients, clinicians, and policy makers to make informed decisions about which procedure is best suited to patients’ personal situations, additional data are needed to understand the adverse event profile of the procedures, as well as patient values regarding procedure choice and the role of surgery relative to other aspects of lifelong weight management,” they concluded.

In an accompanying commentary, Natalie Liu, MD, and Luke M. Funk, MD, of the department of surgery, University of Wisconsin–Madison, said the analysis made an important contribution to the existing literature, despite its limitations.

“It included long-term electronic health record data from a large cohort of U.S. patients who had bariatric surgery in a real-world setting,” they wrote, adding that, although the remission rates were high, the relapse rate in both treatment groups deserved further study.

Dr. Liu and Dr. Funk emphasized that the overall high remission rates for either surgery, compared with lifestyle interventions, suggest the need for continued advocacy for better insurance coverage of, and access to, bariatric surgery procedures for patients with type 2 diabetes, notably those with class 1 obesity.

The study was conducted using the National Patient-Centered Clinical Research Network, which was funded by the Patient-Centered Outcomes Research Institute. Dr. McTigue and Dr. Liu had reported no conflicts of interest. Dr. Funk disclosed a Veterans Affairs Health Services Research & Development Career Development Award, and grants from the VA, National Institutes of Health, and American College of Surgeons.

SOURCES: McTigue KM et al. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0087; Lui N, Funk LM. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0088.

Patients with type 2 diabetes who underwent Roux-en-Y gastric bypass (RYGB) surgery experienced higher rates of diabetes remission, improved glycemic control, greater weight loss, and fewer diabetes relapse events, compared with those who had sleeve gastrectomy, according to findings from nearly 10,000 patients.

“Remission of type 2 diabetes is common after bariatric surgery and may reduce risk for subsequent microvascular and macrovascular disease,” but it is not clear which of the two most common procedures, RYGB or sleeve gastrectomy, has better long-term diabetes and weight outcomes, wrote Kathleen M. McTigue, MD, of the University of Pittsburgh, and colleagues in JAMA Surgery.

To examine the effectiveness of the two procedures, the researchers identified 9,710 adults with type 2 diabetes who were part of the National Patient-Centered Clinical Research Network Bariatric Study. They compared diabetes outcomes for up to 5 years after surgery for 6,233 patients who underwent RYGB and 3,477 who underwent sleeve gastrectomy. The average age of the patients was 50 years, and 73% were women. The average preoperative body mass index was 49 kg/m².

Overall, 6,141 patients experienced diabetes remission. The estimated adjusted cumulative remission rates for the RYGB and sleeve gastrectomy groups after 1 year were 59% and 56%, respectively, and after 5 years were 86% and 84%.

Weight loss was significantly greater in RYGB patients, compared with those who had the sleeve gastrectomy, with average differences in percentage points of 6.3 at 1 year and 8.1 at year 5. RYGB patients also showed significantly better long-term glycemic control, compared with sleeve gastrectomy patients. At 5 years, hemoglobin A_1c levels were 0.80 percentage points below baseline in the RYGB group, and 0.35 percentage points below baseline in the sleeve gastrectomy group.

In addition, after 1 year, diabetes relapse rates in the RYGB and sleeve gastrectomy groups were 8% and 11%, respectively, and 33% and 42% after 5 years.

The findings were limited by several factors, including the observational design of the study and the potential for confounding and coding inaccuracies, the researchers noted, adding that future studies should address the impact of weight loss on diabetes remission and relapse in bariatric surgery patients.

They also noted that their results were in contrast to findings in previous studies that established no significant differences in outcomes between the procedures, but emphasized that most previous studies were smaller and controlled and that outcome differences may be greater in clinical practice.

“For patients, clinicians, and policy makers to make informed decisions about which procedure is best suited to patients’ personal situations, additional data are needed to understand the adverse event profile of the procedures, as well as patient values regarding procedure choice and the role of surgery relative to other aspects of lifelong weight management,” they concluded.

In an accompanying commentary, Natalie Liu, MD, and Luke M. Funk, MD, of the department of surgery, University of Wisconsin–Madison, said the analysis made an important contribution to the existing literature, despite its limitations.

“It included long-term electronic health record data from a large cohort of U.S. patients who had bariatric surgery in a real-world setting,” they wrote, adding that, although the remission rates were high, the relapse rate in both treatment groups deserved further study.

Dr. Liu and Dr. Funk emphasized that the overall high remission rates for either surgery, compared with lifestyle interventions, suggest the need for continued advocacy for better insurance coverage of, and access to, bariatric surgery procedures for patients with type 2 diabetes, notably those with class 1 obesity.

The study was conducted using the National Patient-Centered Clinical Research Network, which was funded by the Patient-Centered Outcomes Research Institute. Dr. McTigue and Dr. Liu had reported no conflicts of interest. Dr. Funk disclosed a Veterans Affairs Health Services Research & Development Career Development Award, and grants from the VA, National Institutes of Health, and American College of Surgeons.

SOURCES: McTigue KM et al. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0087; Lui N, Funk LM. JAMA Surg. 2020 Mar 4. doi: 10.1001/jamasurg.2020.0088.

Young people treated with bariatric surgery for severe obesity did not experience better mental health in the 5 years following their procedures, Swedish researchers said, and indeed fared worse than their nontreated peers on certain measures.

The results of this study do not necessarily argue “that metabolic and bariatric surgery during adolescence causes mental health problems,” the investigators wrote in the Lancet Child and Adolescent Health, but “it is reasonable to conclude that metabolic and bariatric surgery does not result in a substantial alleviation of mental health problems in adolescents with severe obesity,” and that “long-term mental health support should be required in programs providing adolescent metabolic and bariatric surgery.”

Kajsa Järvholm, PhD, of Skåne University Hospital, in Malmö, Sweden, and colleagues reported results from a prospective nonrandomized study that recruited 81 adolescents in Sweden aged 13-18 years (mean age, 16.5) who had a body mass index of 40 or higher, or BMI of 35 with obesity-related comorbidities and who underwent Roux-en-Y gastric bypass for weight loss. Subjects were matched by age, sex, and BMI to 80 controls (mean age, 15.8 years) who were assigned to conventional nonsurgical treatment. All patients were assessed at 1, 2, and 5 years.

Although mental health treatment, including use of psychiatric drugs, did not differ between the groups at baseline, during the follow-up period the subjects who underwent surgery saw 15% more impatient and outpatient mental health treatment, compared with controls, a significant difference. About a quarter of patients in the surgically treated group required specialized mental health treatment for the first time after their surgeries.

Though the surgical group lost much more weight – mean BMI was 32.3 at 5 years, compared with 41.7 for controls – none of the mental health changes from baseline were significantly associated with percentage change of BMI at 5 years.

The findings from the study are consistent with results from studies in adults in which bariatric surgery improves many health outcomes but does not alter the need for mental health treatment. Although 5 years is a longer follow-up than in previous studies in young patients – a key strength of the study – Dr. Järvholm and colleagues acknowledged some weaknesses, including a nonrandomized design, lack of a comparison group of nonobese youths for mental health measures, a small sample size, and a surgical procedure that is now out of favor in adolescents.

The study was funded by Swedish government and health foundations. Dr. Järvholm disclosed pharmaceutical industry funding not related to the study, and three coauthors also disclosed industry relationships.

SOURCE: Järvholm K et al. Lancet Child Adolesc Health. 2020. doi: 10.1016/s2352-4642(20)30024-9.

Young people treated with bariatric surgery for severe obesity did not experience better mental health in the 5 years following their procedures, Swedish researchers said, and indeed fared worse than their nontreated peers on certain measures.

The results of this study do not necessarily argue “that metabolic and bariatric surgery during adolescence causes mental health problems,” the investigators wrote in the Lancet Child and Adolescent Health, but “it is reasonable to conclude that metabolic and bariatric surgery does not result in a substantial alleviation of mental health problems in adolescents with severe obesity,” and that “long-term mental health support should be required in programs providing adolescent metabolic and bariatric surgery.”

Kajsa Järvholm, PhD, of Skåne University Hospital, in Malmö, Sweden, and colleagues reported results from a prospective nonrandomized study that recruited 81 adolescents in Sweden aged 13-18 years (mean age, 16.5) who had a body mass index of 40 or higher, or BMI of 35 with obesity-related comorbidities and who underwent Roux-en-Y gastric bypass for weight loss. Subjects were matched by age, sex, and BMI to 80 controls (mean age, 15.8 years) who were assigned to conventional nonsurgical treatment. All patients were assessed at 1, 2, and 5 years.

Although mental health treatment, including use of psychiatric drugs, did not differ between the groups at baseline, during the follow-up period the subjects who underwent surgery saw 15% more impatient and outpatient mental health treatment, compared with controls, a significant difference. About a quarter of patients in the surgically treated group required specialized mental health treatment for the first time after their surgeries.

Though the surgical group lost much more weight – mean BMI was 32.3 at 5 years, compared with 41.7 for controls – none of the mental health changes from baseline were significantly associated with percentage change of BMI at 5 years.

The findings from the study are consistent with results from studies in adults in which bariatric surgery improves many health outcomes but does not alter the need for mental health treatment. Although 5 years is a longer follow-up than in previous studies in young patients – a key strength of the study – Dr. Järvholm and colleagues acknowledged some weaknesses, including a nonrandomized design, lack of a comparison group of nonobese youths for mental health measures, a small sample size, and a surgical procedure that is now out of favor in adolescents.

The study was funded by Swedish government and health foundations. Dr. Järvholm disclosed pharmaceutical industry funding not related to the study, and three coauthors also disclosed industry relationships.

SOURCE: Järvholm K et al. Lancet Child Adolesc Health. 2020. doi: 10.1016/s2352-4642(20)30024-9.

Young people treated with bariatric surgery for severe obesity did not experience better mental health in the 5 years following their procedures, Swedish researchers said, and indeed fared worse than their nontreated peers on certain measures.

The results of this study do not necessarily argue “that metabolic and bariatric surgery during adolescence causes mental health problems,” the investigators wrote in the Lancet Child and Adolescent Health, but “it is reasonable to conclude that metabolic and bariatric surgery does not result in a substantial alleviation of mental health problems in adolescents with severe obesity,” and that “long-term mental health support should be required in programs providing adolescent metabolic and bariatric surgery.”

Kajsa Järvholm, PhD, of Skåne University Hospital, in Malmö, Sweden, and colleagues reported results from a prospective nonrandomized study that recruited 81 adolescents in Sweden aged 13-18 years (mean age, 16.5) who had a body mass index of 40 or higher, or BMI of 35 with obesity-related comorbidities and who underwent Roux-en-Y gastric bypass for weight loss. Subjects were matched by age, sex, and BMI to 80 controls (mean age, 15.8 years) who were assigned to conventional nonsurgical treatment. All patients were assessed at 1, 2, and 5 years.

Although mental health treatment, including use of psychiatric drugs, did not differ between the groups at baseline, during the follow-up period the subjects who underwent surgery saw 15% more impatient and outpatient mental health treatment, compared with controls, a significant difference. About a quarter of patients in the surgically treated group required specialized mental health treatment for the first time after their surgeries.

Though the surgical group lost much more weight – mean BMI was 32.3 at 5 years, compared with 41.7 for controls – none of the mental health changes from baseline were significantly associated with percentage change of BMI at 5 years.

The findings from the study are consistent with results from studies in adults in which bariatric surgery improves many health outcomes but does not alter the need for mental health treatment. Although 5 years is a longer follow-up than in previous studies in young patients – a key strength of the study – Dr. Järvholm and colleagues acknowledged some weaknesses, including a nonrandomized design, lack of a comparison group of nonobese youths for mental health measures, a small sample size, and a surgical procedure that is now out of favor in adolescents.

The study was funded by Swedish government and health foundations. Dr. Järvholm disclosed pharmaceutical industry funding not related to the study, and three coauthors also disclosed industry relationships.

SOURCE: Järvholm K et al. Lancet Child Adolesc Health. 2020. doi: 10.1016/s2352-4642(20)30024-9.

Sleeve gastrectomy was associated with significantly fewer postsurgical interventions and operations than was Roux-en-Y gastric bypass over longer-term follow-up in a recent cohort study based on real-world clinical data, according to investigators.

Interventions, operations, and hospitalizations were “relatively common” for both procedures over the 5-year follow-up, though significantly less so with sleeve gastrectomy, which has become the most common bariatric operation, the investigators said in a recent report on the study.

The benefit of sleeve gastrectomy seemed to be most pronounced in patients with lower body mass index and those with fewer comorbidities, according to the authors of the report, led by bariatric and general surgeon Anita Courcoulas, MD, of the University of Pittsburgh Medical Center.

That finding is counterintuitive, since in clinical practice, sleeve gastrectomy is frequently thought of as the preferred procedure for individuals with higher BMI or more comorbidities, though Dr. Courcoulas and colleagues cautioned that the findings were “exploratory” and require further investigation. Historically, Roux-en-Y gastric bypass provided more weight loss.

Safety results from this study, balanced by weight loss and health outcomes data, will “help inform procedure-specific decision making for prospective patients and physicians,” said Dr. Courcoulas and coauthors of the report, which appears in JAMA Surgery.

The study included 33,560 adults who had undergone the Roux-en-Y procedure or sleeve gastrectomy, making it one of the largest bariatric cohort studies ever to be done, according to the investigators.

The majority of patients in the study (54%) underwent Roux-en-Y gastric bypass, though the number of sleeve gastrectomy procedures increased each year in the study, which included patients who underwent a primary bariatric surgery procedure between January 2005 and September 2015 at 1 of 10 sites in the National Patient-Centered Clinical Research Network.

Most of the patients were female (80%) and white (66%), and 26% were Hispanic, according to the researchers, who said their study was more racially diverse than other bariatric studies, and therefore potentially more generalizable to real-world clinical practice.

Over the 5-year follow-up period, patients who underwent sleeve gastrectomy were less likely to subsequently undergo operations involving the abdomen, or interventions for enteral access, such as placement of gastrostomy tubes, according to the investigators, who reported a hazard ratio (HR) of 0.72 (95% confidence interval [CI], 0.65-0.79; P less than .001).

The estimated cumulative rate of operations or interventions at 5 years was 8.94% (95% CI, 8.23%-9.65%) for the patients who underwent sleeve gastrectomy, compared with 12.27% (95% CI, 11.49%-13.05%) for those who underwent the Roux-en-Y procedure, according to the report.

Hospitalization was also less likely for sleeve gastrectomy versus Roux-en-Y gastric bypass, with a hazard ratio of 0.82 and estimated cumulative incidence rates of 32.79% and 38.33%, respectively. Likewise, endoscopy was less likely in the sleeve gastrectomy group.

All-cause mortality did not differ between the groups at this 5-year follow-up, the investigators said.

“The present data were gathered from clinical care in the real world, yet the results are comparable to controlled studies and therefore lend additional support to the findings of these other types of studies that operation and intervention occur less commonly after sleeve gastrectomy than after Roux-en-Y gastric bypass for up to 5 years,” Dr. Courcoulas and coauthors noted in a discussion of their results.

This work was funded by the Patient-Centered Outcomes Research Institute. Dr. Courcoulas reported receiving a grant from Allurion. Coauthors provided disclosures related to the National Institutes of Health, IFSO Latin America Chapter, and the Food and Drug Administration.

*This story was updated on January 16, 2020.

SOURCE: Courcoulas A et al. JAMA Surg. 2020 Jan 15. doi: 10.1001/jamasurg.2019.5470.

Sleeve gastrectomy was associated with significantly fewer postsurgical interventions and operations than was Roux-en-Y gastric bypass over longer-term follow-up in a recent cohort study based on real-world clinical data, according to investigators.

Interventions, operations, and hospitalizations were “relatively common” for both procedures over the 5-year follow-up, though significantly less so with sleeve gastrectomy, which has become the most common bariatric operation, the investigators said in a recent report on the study.

The benefit of sleeve gastrectomy seemed to be most pronounced in patients with lower body mass index and those with fewer comorbidities, according to the authors of the report, led by bariatric and general surgeon Anita Courcoulas, MD, of the University of Pittsburgh Medical Center.

That finding is counterintuitive, since in clinical practice, sleeve gastrectomy is frequently thought of as the preferred procedure for individuals with higher BMI or more comorbidities, though Dr. Courcoulas and colleagues cautioned that the findings were “exploratory” and require further investigation. Historically, Roux-en-Y gastric bypass provided more weight loss.

Safety results from this study, balanced by weight loss and health outcomes data, will “help inform procedure-specific decision making for prospective patients and physicians,” said Dr. Courcoulas and coauthors of the report, which appears in JAMA Surgery.

The study included 33,560 adults who had undergone the Roux-en-Y procedure or sleeve gastrectomy, making it one of the largest bariatric cohort studies ever to be done, according to the investigators.

The majority of patients in the study (54%) underwent Roux-en-Y gastric bypass, though the number of sleeve gastrectomy procedures increased each year in the study, which included patients who underwent a primary bariatric surgery procedure between January 2005 and September 2015 at 1 of 10 sites in the National Patient-Centered Clinical Research Network.

Most of the patients were female (80%) and white (66%), and 26% were Hispanic, according to the researchers, who said their study was more racially diverse than other bariatric studies, and therefore potentially more generalizable to real-world clinical practice.

Over the 5-year follow-up period, patients who underwent sleeve gastrectomy were less likely to subsequently undergo operations involving the abdomen, or interventions for enteral access, such as placement of gastrostomy tubes, according to the investigators, who reported a hazard ratio (HR) of 0.72 (95% confidence interval [CI], 0.65-0.79; P less than .001).

The estimated cumulative rate of operations or interventions at 5 years was 8.94% (95% CI, 8.23%-9.65%) for the patients who underwent sleeve gastrectomy, compared with 12.27% (95% CI, 11.49%-13.05%) for those who underwent the Roux-en-Y procedure, according to the report.

Hospitalization was also less likely for sleeve gastrectomy versus Roux-en-Y gastric bypass, with a hazard ratio of 0.82 and estimated cumulative incidence rates of 32.79% and 38.33%, respectively. Likewise, endoscopy was less likely in the sleeve gastrectomy group.

All-cause mortality did not differ between the groups at this 5-year follow-up, the investigators said.

“The present data were gathered from clinical care in the real world, yet the results are comparable to controlled studies and therefore lend additional support to the findings of these other types of studies that operation and intervention occur less commonly after sleeve gastrectomy than after Roux-en-Y gastric bypass for up to 5 years,” Dr. Courcoulas and coauthors noted in a discussion of their results.

This work was funded by the Patient-Centered Outcomes Research Institute. Dr. Courcoulas reported receiving a grant from Allurion. Coauthors provided disclosures related to the National Institutes of Health, IFSO Latin America Chapter, and the Food and Drug Administration.

*This story was updated on January 16, 2020.

SOURCE: Courcoulas A et al. JAMA Surg. 2020 Jan 15. doi: 10.1001/jamasurg.2019.5470.

Sleeve gastrectomy was associated with significantly fewer postsurgical interventions and operations than was Roux-en-Y gastric bypass over longer-term follow-up in a recent cohort study based on real-world clinical data, according to investigators.

Interventions, operations, and hospitalizations were “relatively common” for both procedures over the 5-year follow-up, though significantly less so with sleeve gastrectomy, which has become the most common bariatric operation, the investigators said in a recent report on the study.

The benefit of sleeve gastrectomy seemed to be most pronounced in patients with lower body mass index and those with fewer comorbidities, according to the authors of the report, led by bariatric and general surgeon Anita Courcoulas, MD, of the University of Pittsburgh Medical Center.

That finding is counterintuitive, since in clinical practice, sleeve gastrectomy is frequently thought of as the preferred procedure for individuals with higher BMI or more comorbidities, though Dr. Courcoulas and colleagues cautioned that the findings were “exploratory” and require further investigation. Historically, Roux-en-Y gastric bypass provided more weight loss.

Safety results from this study, balanced by weight loss and health outcomes data, will “help inform procedure-specific decision making for prospective patients and physicians,” said Dr. Courcoulas and coauthors of the report, which appears in JAMA Surgery.

The study included 33,560 adults who had undergone the Roux-en-Y procedure or sleeve gastrectomy, making it one of the largest bariatric cohort studies ever to be done, according to the investigators.

The majority of patients in the study (54%) underwent Roux-en-Y gastric bypass, though the number of sleeve gastrectomy procedures increased each year in the study, which included patients who underwent a primary bariatric surgery procedure between January 2005 and September 2015 at 1 of 10 sites in the National Patient-Centered Clinical Research Network.

Most of the patients were female (80%) and white (66%), and 26% were Hispanic, according to the researchers, who said their study was more racially diverse than other bariatric studies, and therefore potentially more generalizable to real-world clinical practice.

Over the 5-year follow-up period, patients who underwent sleeve gastrectomy were less likely to subsequently undergo operations involving the abdomen, or interventions for enteral access, such as placement of gastrostomy tubes, according to the investigators, who reported a hazard ratio (HR) of 0.72 (95% confidence interval [CI], 0.65-0.79; P less than .001).

The estimated cumulative rate of operations or interventions at 5 years was 8.94% (95% CI, 8.23%-9.65%) for the patients who underwent sleeve gastrectomy, compared with 12.27% (95% CI, 11.49%-13.05%) for those who underwent the Roux-en-Y procedure, according to the report.

Hospitalization was also less likely for sleeve gastrectomy versus Roux-en-Y gastric bypass, with a hazard ratio of 0.82 and estimated cumulative incidence rates of 32.79% and 38.33%, respectively. Likewise, endoscopy was less likely in the sleeve gastrectomy group.

All-cause mortality did not differ between the groups at this 5-year follow-up, the investigators said.

“The present data were gathered from clinical care in the real world, yet the results are comparable to controlled studies and therefore lend additional support to the findings of these other types of studies that operation and intervention occur less commonly after sleeve gastrectomy than after Roux-en-Y gastric bypass for up to 5 years,” Dr. Courcoulas and coauthors noted in a discussion of their results.

This work was funded by the Patient-Centered Outcomes Research Institute. Dr. Courcoulas reported receiving a grant from Allurion. Coauthors provided disclosures related to the National Institutes of Health, IFSO Latin America Chapter, and the Food and Drug Administration.

*This story was updated on January 16, 2020.

SOURCE: Courcoulas A et al. JAMA Surg. 2020 Jan 15. doi: 10.1001/jamasurg.2019.5470.

LOS ANGELES – In the clinical experience of Kurt GMM Alberti, DPhil, FRCP, FRCPath, bariatric surgery should be used earlier in the course of diabetes to yield the most benefit. The problem is, far fewer people with diabetes are being referred for the surgery than would benefit from it.

Doug Brunk/MDedge News

At the World Congress on Insulin Resistance, Diabetes, and Cardiovascular Disease, Dr. Alberti said that only about 1% of eligible patients in the United States undergo bariatric surgery, compared with just 0.22% of eligible patients in the United Kingdom.

“Obesity is an increasing problem,” said Dr. Alberti, a senior research investigator in the section of diabetes, endocrinology, and metabolism at Imperial College, London. “The United States is leading the field [in obesity], and it doesn’t seem to be going away. This is in parallel with diabetes. According to the 2019 International Diabetes Federation’s Diabetes Atlas, the diabetes prevalence worldwide is now 463 million. It’s projected to reach 578 million by 2030 and 700 million by 2045. We have a major problem.”

Lifestyle modification with diet and exercise have been the cornerstone of diabetes therapy for more than 100 years, with only modest success. “A range of oral agents have been added [and they] certainly improve glycemic control, but few achieve lasting success, and few achieve remission,” Dr. Alberti said. Findings from DiRECT (Lancet. 2018;391:541-51) and the Look AHEAD (Action for Health in Diabetes) study (N Engl J Med. 2013;369:145-54) have shown dramatic improvements in glycemia, but only in the minority of patients who achieved weight loss of 10 kg or more. “In this group, 80% achieved remission after 2 years in DiRECT,” he said. “It is uncertain whether this can be sustained long term in real life, and how many people will respond. Major community prevention programs are under way in the U.S. and [United Kingdom], but many target individuals with prediabetes. Currently, it is unknown how successful these programs will be.”

The 2018 American Diabetes Association/European Association for the Study of Diabetes clinical guidelines state that bariatric surgery is a recommended treatment option for adults with type 2 diabetes and a body mass index of either 40.0 kg/m² or higher (or 37.5 kg/m² or higher in people of Asian ancestry) or 35.0-39.9 kg/m² (32.5-37.4 kg/m² in people of Asian ancestry) and who do not achieve durable weight loss and improvement in comorbidities with reasonable nonsurgical methods. According to Dr. Alberti, surgery should be an accepted option in people who have type 2 diabetes and a body mass index of 30 kg/m² or higher, and priority should be given to adolescents, young adults, and those with a shorter duration of diabetes.

The main suggestive evidence in favor of bariatric surgery having an impact on diabetes comes from the Swedish Obese Subjects Study, which had a median follow-up of 10 years (J Intern Med. 2013;273[3]:219-34). In patients with diabetes at baseline, 30% were still in remission at 15 years after surgery. After 18 years, cumulative microvascular disease had fallen from 42 to 21 per 1,000 person-years, and macrovascular complications had fallen by 25%. “This was not a randomized, controlled trial, however,” Dr. Alberti said. Several of these studies have now been performed, including the STAMPEDE trial (N Engl J Med. 2017;376:641-51) and recent studies led by Geltrude Mingrone, MD, PhD, which show major glycemic benefit (Lancet. 2015;386[9997]:P964-73) with bariatric surgery.

According to Dr. Alberti, laparoscopic adjustable gastric lap band is the easiest bariatric surgery to perform but it has fallen out of favor because of lower diabetes remission rates, compared with the other procedures. Roux-en-Y gastric bypass, sleeve gastrectomy, and biliary pancreatic diversion are all in use. Slightly higher remission rates have been shown with biliary pancreatic diversion. “There have also been consistent improvements in quality of life and cardiovascular risk factors,” he said. “Long-term follow-up is still [needed], but, in general, it seems that diabetic complications are lower than in medically treated control groups, and mortality may also be lower. The real question is, what is the impact on complications? There we have a problem, because we do not have any good randomized, controlled trials covering a 10- to 20-year period, which would give us clear evidence. There is reasonable evidence from cohort studies, though.”

Added benefits of bariatric surgery include improved quality of life, decreased blood pressure, less sleep apnea, improved cardiovascular risk factors, and better musculoskeletal function. For now, though, an unmet need persists. “The problem is that far fewer people are referred for bariatric surgery than would benefit,” Dr. Alberti said. “There are several barriers to greater use of bariatric surgery in those with diabetes. These include physician attitudes, inadequate referrals, patient perceptions, lack of awareness among patients, inadequate insurance coverage, and particularly health system capacity. There is also a lack of sympathy for overweight people in some places.”

Dr. Alberti reported having no financial disclosures.

dbrunk@mdedge.com

LOS ANGELES – In the clinical experience of Kurt GMM Alberti, DPhil, FRCP, FRCPath, bariatric surgery should be used earlier in the course of diabetes to yield the most benefit. The problem is, far fewer people with diabetes are being referred for the surgery than would benefit from it.

Doug Brunk/MDedge News

At the World Congress on Insulin Resistance, Diabetes, and Cardiovascular Disease, Dr. Alberti said that only about 1% of eligible patients in the United States undergo bariatric surgery, compared with just 0.22% of eligible patients in the United Kingdom.

“Obesity is an increasing problem,” said Dr. Alberti, a senior research investigator in the section of diabetes, endocrinology, and metabolism at Imperial College, London. “The United States is leading the field [in obesity], and it doesn’t seem to be going away. This is in parallel with diabetes. According to the 2019 International Diabetes Federation’s Diabetes Atlas, the diabetes prevalence worldwide is now 463 million. It’s projected to reach 578 million by 2030 and 700 million by 2045. We have a major problem.”

Lifestyle modification with diet and exercise have been the cornerstone of diabetes therapy for more than 100 years, with only modest success. “A range of oral agents have been added [and they] certainly improve glycemic control, but few achieve lasting success, and few achieve remission,” Dr. Alberti said. Findings from DiRECT (Lancet. 2018;391:541-51) and the Look AHEAD (Action for Health in Diabetes) study (N Engl J Med. 2013;369:145-54) have shown dramatic improvements in glycemia, but only in the minority of patients who achieved weight loss of 10 kg or more. “In this group, 80% achieved remission after 2 years in DiRECT,” he said. “It is uncertain whether this can be sustained long term in real life, and how many people will respond. Major community prevention programs are under way in the U.S. and [United Kingdom], but many target individuals with prediabetes. Currently, it is unknown how successful these programs will be.”

The 2018 American Diabetes Association/European Association for the Study of Diabetes clinical guidelines state that bariatric surgery is a recommended treatment option for adults with type 2 diabetes and a body mass index of either 40.0 kg/m² or higher (or 37.5 kg/m² or higher in people of Asian ancestry) or 35.0-39.9 kg/m² (32.5-37.4 kg/m² in people of Asian ancestry) and who do not achieve durable weight loss and improvement in comorbidities with reasonable nonsurgical methods. According to Dr. Alberti, surgery should be an accepted option in people who have type 2 diabetes and a body mass index of 30 kg/m² or higher, and priority should be given to adolescents, young adults, and those with a shorter duration of diabetes.

The main suggestive evidence in favor of bariatric surgery having an impact on diabetes comes from the Swedish Obese Subjects Study, which had a median follow-up of 10 years (J Intern Med. 2013;273[3]:219-34). In patients with diabetes at baseline, 30% were still in remission at 15 years after surgery. After 18 years, cumulative microvascular disease had fallen from 42 to 21 per 1,000 person-years, and macrovascular complications had fallen by 25%. “This was not a randomized, controlled trial, however,” Dr. Alberti said. Several of these studies have now been performed, including the STAMPEDE trial (N Engl J Med. 2017;376:641-51) and recent studies led by Geltrude Mingrone, MD, PhD, which show major glycemic benefit (Lancet. 2015;386[9997]:P964-73) with bariatric surgery.

According to Dr. Alberti, laparoscopic adjustable gastric lap band is the easiest bariatric surgery to perform but it has fallen out of favor because of lower diabetes remission rates, compared with the other procedures. Roux-en-Y gastric bypass, sleeve gastrectomy, and biliary pancreatic diversion are all in use. Slightly higher remission rates have been shown with biliary pancreatic diversion. “There have also been consistent improvements in quality of life and cardiovascular risk factors,” he said. “Long-term follow-up is still [needed], but, in general, it seems that diabetic complications are lower than in medically treated control groups, and mortality may also be lower. The real question is, what is the impact on complications? There we have a problem, because we do not have any good randomized, controlled trials covering a 10- to 20-year period, which would give us clear evidence. There is reasonable evidence from cohort studies, though.”

Added benefits of bariatric surgery include improved quality of life, decreased blood pressure, less sleep apnea, improved cardiovascular risk factors, and better musculoskeletal function. For now, though, an unmet need persists. “The problem is that far fewer people are referred for bariatric surgery than would benefit,” Dr. Alberti said. “There are several barriers to greater use of bariatric surgery in those with diabetes. These include physician attitudes, inadequate referrals, patient perceptions, lack of awareness among patients, inadequate insurance coverage, and particularly health system capacity. There is also a lack of sympathy for overweight people in some places.”

Dr. Alberti reported having no financial disclosures.

dbrunk@mdedge.com

LOS ANGELES – In the clinical experience of Kurt GMM Alberti, DPhil, FRCP, FRCPath, bariatric surgery should be used earlier in the course of diabetes to yield the most benefit. The problem is, far fewer people with diabetes are being referred for the surgery than would benefit from it.

Doug Brunk/MDedge News

At the World Congress on Insulin Resistance, Diabetes, and Cardiovascular Disease, Dr. Alberti said that only about 1% of eligible patients in the United States undergo bariatric surgery, compared with just 0.22% of eligible patients in the United Kingdom.

“Obesity is an increasing problem,” said Dr. Alberti, a senior research investigator in the section of diabetes, endocrinology, and metabolism at Imperial College, London. “The United States is leading the field [in obesity], and it doesn’t seem to be going away. This is in parallel with diabetes. According to the 2019 International Diabetes Federation’s Diabetes Atlas, the diabetes prevalence worldwide is now 463 million. It’s projected to reach 578 million by 2030 and 700 million by 2045. We have a major problem.”

Lifestyle modification with diet and exercise have been the cornerstone of diabetes therapy for more than 100 years, with only modest success. “A range of oral agents have been added [and they] certainly improve glycemic control, but few achieve lasting success, and few achieve remission,” Dr. Alberti said. Findings from DiRECT (Lancet. 2018;391:541-51) and the Look AHEAD (Action for Health in Diabetes) study (N Engl J Med. 2013;369:145-54) have shown dramatic improvements in glycemia, but only in the minority of patients who achieved weight loss of 10 kg or more. “In this group, 80% achieved remission after 2 years in DiRECT,” he said. “It is uncertain whether this can be sustained long term in real life, and how many people will respond. Major community prevention programs are under way in the U.S. and [United Kingdom], but many target individuals with prediabetes. Currently, it is unknown how successful these programs will be.”

The 2018 American Diabetes Association/European Association for the Study of Diabetes clinical guidelines state that bariatric surgery is a recommended treatment option for adults with type 2 diabetes and a body mass index of either 40.0 kg/m² or higher (or 37.5 kg/m² or higher in people of Asian ancestry) or 35.0-39.9 kg/m² (32.5-37.4 kg/m² in people of Asian ancestry) and who do not achieve durable weight loss and improvement in comorbidities with reasonable nonsurgical methods. According to Dr. Alberti, surgery should be an accepted option in people who have type 2 diabetes and a body mass index of 30 kg/m² or higher, and priority should be given to adolescents, young adults, and those with a shorter duration of diabetes.

The main suggestive evidence in favor of bariatric surgery having an impact on diabetes comes from the Swedish Obese Subjects Study, which had a median follow-up of 10 years (J Intern Med. 2013;273[3]:219-34). In patients with diabetes at baseline, 30% were still in remission at 15 years after surgery. After 18 years, cumulative microvascular disease had fallen from 42 to 21 per 1,000 person-years, and macrovascular complications had fallen by 25%. “This was not a randomized, controlled trial, however,” Dr. Alberti said. Several of these studies have now been performed, including the STAMPEDE trial (N Engl J Med. 2017;376:641-51) and recent studies led by Geltrude Mingrone, MD, PhD, which show major glycemic benefit (Lancet. 2015;386[9997]:P964-73) with bariatric surgery.

According to Dr. Alberti, laparoscopic adjustable gastric lap band is the easiest bariatric surgery to perform but it has fallen out of favor because of lower diabetes remission rates, compared with the other procedures. Roux-en-Y gastric bypass, sleeve gastrectomy, and biliary pancreatic diversion are all in use. Slightly higher remission rates have been shown with biliary pancreatic diversion. “There have also been consistent improvements in quality of life and cardiovascular risk factors,” he said. “Long-term follow-up is still [needed], but, in general, it seems that diabetic complications are lower than in medically treated control groups, and mortality may also be lower. The real question is, what is the impact on complications? There we have a problem, because we do not have any good randomized, controlled trials covering a 10- to 20-year period, which would give us clear evidence. There is reasonable evidence from cohort studies, though.”

Added benefits of bariatric surgery include improved quality of life, decreased blood pressure, less sleep apnea, improved cardiovascular risk factors, and better musculoskeletal function. For now, though, an unmet need persists. “The problem is that far fewer people are referred for bariatric surgery than would benefit,” Dr. Alberti said. “There are several barriers to greater use of bariatric surgery in those with diabetes. These include physician attitudes, inadequate referrals, patient perceptions, lack of awareness among patients, inadequate insurance coverage, and particularly health system capacity. There is also a lack of sympathy for overweight people in some places.”

Dr. Alberti reported having no financial disclosures.

dbrunk@mdedge.com

LAS VEGAS – U.S. patients with diabetes who underwent bariatric surgery during 2015-2017 had a 49% higher rate of deep surgical-site infections and a 31% higher rate of 30-day ICU admissions, compared with patients without diabetes, in an analysis of more than 550,000 patients who underwent this surgery.

Mitchel L. Zoler/MDedge News

The analysis also showed that among patients with diabetes undergoing bariatric surgery, those with insulin-dependent diabetes had significantly higher rates of these and other complications, compared with patients with diabetes but no insulin dependence, Andrew A. Wheeler, MD, said at a meeting presented by The Obesity Society and the American Society for Metabolic and Bariatric Surgery.

The specific factors driving these observations remain unknown, but may relate at least in part to the efficacy of glycemic control in patients during the months and weeks before surgery, said Dr. Wheeler, chief of metabolic and bariatric surgery at the University of Missouri in Columbia.

“Perioperative blood glucose control reflected in hemoglobin A_1c may help us understand if certain patients with diabetes are at increased risk of surgical complications,” Dr. Wheeler said during his talk. “We need to see whether preoperative hemoglobin A_1c tracks with the rate of complications,” he added in an interview. “Some surgeons will defer surgery until the level goes down, but right now, everyone uses a different level.”

The study by Dr. Wheeler and associates used data collected from essentially all the bariatric surgeries done at the roughly 840 U.S. centers accredited to do the surgery during 2015-2017 – a total of 555,239 patients – in the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program run by the American College of Surgeons and the American Society for Metabolic and Bariatric Surgery. The cohort included 413,239 patients without diabetes and 136,010 with diabetes, with the remainder having an unknown status. Nearly all patients underwent either sleeve gastrectomy or gastric bypass, with significantly more patients, 74%, having sleeve gastrectomy in the group without diabetes, and 62% of those with diabetes undergoing sleeve gastrectomy.

Patients with diabetes uniformly had significantly higher rates of complications as measured by several parameters, and among those with diabetes, the complication rates were highest in those with insulin dependence. The researchers ran a multivariate analysis that controlled for many demographic and clinical variables, and found that despite these corrections, patients with diabetes, and especially those with insulin dependence, had higher relative rates of many complications that were statistically significant. In addition to the increased rates of deep surgical-site infections and 30-day ICU admissions, patients with diabetes had a 54% relatively increased rate of wound disruption, and a 29% increased relative rate of superficial surgical-site infections, compared with those without diabetes. And among patients with diabetes, those with insulin dependence had a 40% increased rate of surgical-site infections, a 74% increase in progressive renal failure, and a 39% increased rate of hospital readmission relative to patients with diabetes that was not insulin dependent, Dr. Wheeler reported.

The absolute complication rates were, in general, low. For example, the total rate of superficial plus deep surgical-site infections was less than 1% both in patients with diabetes and those without, although the rate rose above 1% in patients with insulin-dependent diabetes. The most common complication reported by Dr. Wheeler was 30-day hospital readmission, which was 4.0% in patients without diabetes, 4.8% in those with diabetes, and 6.4% in patients with insulin-dependent diabetes. The data also showed that gastric bypass led to more complications than did sleeve gastrectomy, but complications with both types of surgeries increased in patients with diabetes, compared with those without diabetes.

Dr. Wheeler had no disclosures.

mzoler@mdedge.com

SOURCE: Wheeler AA et al. Obesity Week 2019, Abstract A133.

LAS VEGAS – U.S. patients with diabetes who underwent bariatric surgery during 2015-2017 had a 49% higher rate of deep surgical-site infections and a 31% higher rate of 30-day ICU admissions, compared with patients without diabetes, in an analysis of more than 550,000 patients who underwent this surgery.

Mitchel L. Zoler/MDedge News

The analysis also showed that among patients with diabetes undergoing bariatric surgery, those with insulin-dependent diabetes had significantly higher rates of these and other complications, compared with patients with diabetes but no insulin dependence, Andrew A. Wheeler, MD, said at a meeting presented by The Obesity Society and the American Society for Metabolic and Bariatric Surgery.

The specific factors driving these observations remain unknown, but may relate at least in part to the efficacy of glycemic control in patients during the months and weeks before surgery, said Dr. Wheeler, chief of metabolic and bariatric surgery at the University of Missouri in Columbia.

“Perioperative blood glucose control reflected in hemoglobin A_1c may help us understand if certain patients with diabetes are at increased risk of surgical complications,” Dr. Wheeler said during his talk. “We need to see whether preoperative hemoglobin A_1c tracks with the rate of complications,” he added in an interview. “Some surgeons will defer surgery until the level goes down, but right now, everyone uses a different level.”

The study by Dr. Wheeler and associates used data collected from essentially all the bariatric surgeries done at the roughly 840 U.S. centers accredited to do the surgery during 2015-2017 – a total of 555,239 patients – in the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program run by the American College of Surgeons and the American Society for Metabolic and Bariatric Surgery. The cohort included 413,239 patients without diabetes and 136,010 with diabetes, with the remainder having an unknown status. Nearly all patients underwent either sleeve gastrectomy or gastric bypass, with significantly more patients, 74%, having sleeve gastrectomy in the group without diabetes, and 62% of those with diabetes undergoing sleeve gastrectomy.

Patients with diabetes uniformly had significantly higher rates of complications as measured by several parameters, and among those with diabetes, the complication rates were highest in those with insulin dependence. The researchers ran a multivariate analysis that controlled for many demographic and clinical variables, and found that despite these corrections, patients with diabetes, and especially those with insulin dependence, had higher relative rates of many complications that were statistically significant. In addition to the increased rates of deep surgical-site infections and 30-day ICU admissions, patients with diabetes had a 54% relatively increased rate of wound disruption, and a 29% increased relative rate of superficial surgical-site infections, compared with those without diabetes. And among patients with diabetes, those with insulin dependence had a 40% increased rate of surgical-site infections, a 74% increase in progressive renal failure, and a 39% increased rate of hospital readmission relative to patients with diabetes that was not insulin dependent, Dr. Wheeler reported.

The absolute complication rates were, in general, low. For example, the total rate of superficial plus deep surgical-site infections was less than 1% both in patients with diabetes and those without, although the rate rose above 1% in patients with insulin-dependent diabetes. The most common complication reported by Dr. Wheeler was 30-day hospital readmission, which was 4.0% in patients without diabetes, 4.8% in those with diabetes, and 6.4% in patients with insulin-dependent diabetes. The data also showed that gastric bypass led to more complications than did sleeve gastrectomy, but complications with both types of surgeries increased in patients with diabetes, compared with those without diabetes.

Dr. Wheeler had no disclosures.

mzoler@mdedge.com

SOURCE: Wheeler AA et al. Obesity Week 2019, Abstract A133.

LAS VEGAS – U.S. patients with diabetes who underwent bariatric surgery during 2015-2017 had a 49% higher rate of deep surgical-site infections and a 31% higher rate of 30-day ICU admissions, compared with patients without diabetes, in an analysis of more than 550,000 patients who underwent this surgery.

Mitchel L. Zoler/MDedge News

The analysis also showed that among patients with diabetes undergoing bariatric surgery, those with insulin-dependent diabetes had significantly higher rates of these and other complications, compared with patients with diabetes but no insulin dependence, Andrew A. Wheeler, MD, said at a meeting presented by The Obesity Society and the American Society for Metabolic and Bariatric Surgery.

The specific factors driving these observations remain unknown, but may relate at least in part to the efficacy of glycemic control in patients during the months and weeks before surgery, said Dr. Wheeler, chief of metabolic and bariatric surgery at the University of Missouri in Columbia.

“Perioperative blood glucose control reflected in hemoglobin A_1c may help us understand if certain patients with diabetes are at increased risk of surgical complications,” Dr. Wheeler said during his talk. “We need to see whether preoperative hemoglobin A_1c tracks with the rate of complications,” he added in an interview. “Some surgeons will defer surgery until the level goes down, but right now, everyone uses a different level.”

The study by Dr. Wheeler and associates used data collected from essentially all the bariatric surgeries done at the roughly 840 U.S. centers accredited to do the surgery during 2015-2017 – a total of 555,239 patients – in the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program run by the American College of Surgeons and the American Society for Metabolic and Bariatric Surgery. The cohort included 413,239 patients without diabetes and 136,010 with diabetes, with the remainder having an unknown status. Nearly all patients underwent either sleeve gastrectomy or gastric bypass, with significantly more patients, 74%, having sleeve gastrectomy in the group without diabetes, and 62% of those with diabetes undergoing sleeve gastrectomy.

Patients with diabetes uniformly had significantly higher rates of complications as measured by several parameters, and among those with diabetes, the complication rates were highest in those with insulin dependence. The researchers ran a multivariate analysis that controlled for many demographic and clinical variables, and found that despite these corrections, patients with diabetes, and especially those with insulin dependence, had higher relative rates of many complications that were statistically significant. In addition to the increased rates of deep surgical-site infections and 30-day ICU admissions, patients with diabetes had a 54% relatively increased rate of wound disruption, and a 29% increased relative rate of superficial surgical-site infections, compared with those without diabetes. And among patients with diabetes, those with insulin dependence had a 40% increased rate of surgical-site infections, a 74% increase in progressive renal failure, and a 39% increased rate of hospital readmission relative to patients with diabetes that was not insulin dependent, Dr. Wheeler reported.

The absolute complication rates were, in general, low. For example, the total rate of superficial plus deep surgical-site infections was less than 1% both in patients with diabetes and those without, although the rate rose above 1% in patients with insulin-dependent diabetes. The most common complication reported by Dr. Wheeler was 30-day hospital readmission, which was 4.0% in patients without diabetes, 4.8% in those with diabetes, and 6.4% in patients with insulin-dependent diabetes. The data also showed that gastric bypass led to more complications than did sleeve gastrectomy, but complications with both types of surgeries increased in patients with diabetes, compared with those without diabetes.

Dr. Wheeler had no disclosures.

mzoler@mdedge.com

SOURCE: Wheeler AA et al. Obesity Week 2019, Abstract A133.

LAS VEGAS – The ability of bariatric surgery and substantial subsequent weight loss to cut the incidence of a variety of obesity-related cancers and other malignancies received further confirmation in results from two studies reported at a meeting presented by the Obesity Society and the American Society for Metabolic and Bariatric Surgery.

Mitchel L. Zoler/MDedge News

In one study, 2,107 adults enrolled in the Longitudinal Assessment of Bariatric Surgery (LABS-2) study showed a statistically significant halving of the cancer incidence during 7 years of follow-up in patients who underwent bariatric surgery and had a reduction of at least 20% in their presurgical body mass index (BMI), compared with patients in the study who underwent bariatric surgery but lost less weight, reported Andrea M. Stroud, MD, a bariatric surgeon at the Oregon Health & Science University, Portland.

In the second study, analysis of about 1.7 million hospitalized U.S. patients in the National Inpatient Sample showed that the incidence of an obesity-related cancer was 21% higher in more than 1.4 million obese individuals (BMI, 35 kg/m² or greater) with no history of bariatric surgery, compared with nearly 247,000 people in the same database with a history of both obesity and bariatric surgery, said Juliana Henrique, MD, a bariatric surgeon at the Cleveland Clinic Florida in Weston.

The study reported by Dr. Henrique focused specifically on the 13 cancer types identified by the Centers for Disease Control and Prevention as having an incidence that links with overweight and obesity (Morb Mortal Wkly Rep. 2017;66[39]:1052-8), whereas the study presented by Dr. Stroud included all incident cancers during follow-up, but which were predominantly obesity related, with breast cancer – an obesity-related malignancy – having the highest incidence. Overall, 40% of all U.S. cancers in 2014 were obesity related, according to the CDC’s report.

Mitchel L. Zoler/MDedge News

“A number of studies have shown decreases in cancer rates after bariatric surgery, especially female cancers like breast and ovarian,” commented John Scott, MD, director of metabolic and bariatric surgery for Prism Health–Upstate in Greenville, S.C. “These two reports build on that.”

The evidence for weight loss after bariatric surgery as a means to cut the risk of a first or recurrent cancer has become strong enough for some patients to see cancer prophylaxis as a prime reason to undergo the procedure, said surgeons at the meeting.

Bariatric surgery and subsequent weight loss “is a substantial preventive factor for cancer, especially in patients who have obesity and diabetes,” commented Theresa LaMasters, MD, a bariatric surgeon in West Des Moines, Iowa. “It might not just be weight loss. It’s likely a multifactorial effect, including reduced inflammation after bariatric surgery, but weight loss is a component” of the effect, Dr. LaMasters said in an interview. It is now common for her to see patients seeking bariatric surgery because of a family or personal history of cancer. “Patients are trying to reduce their future risk” for cancer with bariatric surgery, she added.

The LABS-2 study enrolled 2,458 patients who were part of the first LABS cohort, LABS-1, but followed them longer term. The data Dr. Stroud reported came from 2,107 of the LABS-2 patients without a history of cancer, no cancer diagnosed in the first year after bariatric surgery, and longer-term follow-up of 7 years. About three-quarters of the patients underwent gastric bypass, with the rest undergoing laparoscopic gastric band placement. Nearly half of those included had diabetes. Their average BMI was 45-50 kg/m².

Dr. Stroud and associates ran an analysis that divided the populations into tertiles based on percentage of baseline body mass lost at 12 months after surgery and cancer-free survival during the 7 years after the 12-month follow-up. The incidence of cancer was 51% lower in patients who lost 20%-34% of their BMI, compared with those who lost less than 20%, a statistically significant difference, and patients who lost 35% or more of their BMI had a 31% reduced cancer rate, compared with those who lost less than 20%, a difference that was not statistically significant, Dr. Stroud reported. The patients who lost less weight after surgery mostly underwent gastric banding, whereas those who lost more mostly underwent gastric bypass.

Mitchel L. Zoler/MDedge News

The analysis reported by Dr. Henrique used data collected in the U.S. National Inpatient Sample during 2010-2014, which totaled more than 7 million patients hospitalized for cancer, including 1,423,367 with a history of obesity and 246,668 with obesity who had undergone bariatric surgery. Those without bariatric surgery had a 21% higher rate of developing obesity-related cancers after adjustment for many baseline demographic and clinical features, Dr. Henrique said. The cancer protection after bariatric surgery was especially notable in the subset of patients in the sample with a genetic predisposition to developing cancer.

LABS-1 and LABS-2 were funded by the National Institute of Diabetes and Digestive and Kidney Diseases. Dr. Stroud and Dr. Henrique had no disclosures.

mzoler@mdedge.com

SOURCES: Stroud AM et al. Obesity Week, Abstract A107; Henrique J et al. Obesity Week, Abstract A108.

LAS VEGAS – The ability of bariatric surgery and substantial subsequent weight loss to cut the incidence of a variety of obesity-related cancers and other malignancies received further confirmation in results from two studies reported at a meeting presented by the Obesity Society and the American Society for Metabolic and Bariatric Surgery.

Mitchel L. Zoler/MDedge News

In one study, 2,107 adults enrolled in the Longitudinal Assessment of Bariatric Surgery (LABS-2) study showed a statistically significant halving of the cancer incidence during 7 years of follow-up in patients who underwent bariatric surgery and had a reduction of at least 20% in their presurgical body mass index (BMI), compared with patients in the study who underwent bariatric surgery but lost less weight, reported Andrea M. Stroud, MD, a bariatric surgeon at the Oregon Health & Science University, Portland.

In the second study, analysis of about 1.7 million hospitalized U.S. patients in the National Inpatient Sample showed that the incidence of an obesity-related cancer was 21% higher in more than 1.4 million obese individuals (BMI, 35 kg/m² or greater) with no history of bariatric surgery, compared with nearly 247,000 people in the same database with a history of both obesity and bariatric surgery, said Juliana Henrique, MD, a bariatric surgeon at the Cleveland Clinic Florida in Weston.

The study reported by Dr. Henrique focused specifically on the 13 cancer types identified by the Centers for Disease Control and Prevention as having an incidence that links with overweight and obesity (Morb Mortal Wkly Rep. 2017;66[39]:1052-8), whereas the study presented by Dr. Stroud included all incident cancers during follow-up, but which were predominantly obesity related, with breast cancer – an obesity-related malignancy – having the highest incidence. Overall, 40% of all U.S. cancers in 2014 were obesity related, according to the CDC’s report.

Mitchel L. Zoler/MDedge News

“A number of studies have shown decreases in cancer rates after bariatric surgery, especially female cancers like breast and ovarian,” commented John Scott, MD, director of metabolic and bariatric surgery for Prism Health–Upstate in Greenville, S.C. “These two reports build on that.”

The evidence for weight loss after bariatric surgery as a means to cut the risk of a first or recurrent cancer has become strong enough for some patients to see cancer prophylaxis as a prime reason to undergo the procedure, said surgeons at the meeting.

Bariatric surgery and subsequent weight loss “is a substantial preventive factor for cancer, especially in patients who have obesity and diabetes,” commented Theresa LaMasters, MD, a bariatric surgeon in West Des Moines, Iowa. “It might not just be weight loss. It’s likely a multifactorial effect, including reduced inflammation after bariatric surgery, but weight loss is a component” of the effect, Dr. LaMasters said in an interview. It is now common for her to see patients seeking bariatric surgery because of a family or personal history of cancer. “Patients are trying to reduce their future risk” for cancer with bariatric surgery, she added.

The LABS-2 study enrolled 2,458 patients who were part of the first LABS cohort, LABS-1, but followed them longer term. The data Dr. Stroud reported came from 2,107 of the LABS-2 patients without a history of cancer, no cancer diagnosed in the first year after bariatric surgery, and longer-term follow-up of 7 years. About three-quarters of the patients underwent gastric bypass, with the rest undergoing laparoscopic gastric band placement. Nearly half of those included had diabetes. Their average BMI was 45-50 kg/m².

Dr. Stroud and associates ran an analysis that divided the populations into tertiles based on percentage of baseline body mass lost at 12 months after surgery and cancer-free survival during the 7 years after the 12-month follow-up. The incidence of cancer was 51% lower in patients who lost 20%-34% of their BMI, compared with those who lost less than 20%, a statistically significant difference, and patients who lost 35% or more of their BMI had a 31% reduced cancer rate, compared with those who lost less than 20%, a difference that was not statistically significant, Dr. Stroud reported. The patients who lost less weight after surgery mostly underwent gastric banding, whereas those who lost more mostly underwent gastric bypass.

Mitchel L. Zoler/MDedge News

The analysis reported by Dr. Henrique used data collected in the U.S. National Inpatient Sample during 2010-2014, which totaled more than 7 million patients hospitalized for cancer, including 1,423,367 with a history of obesity and 246,668 with obesity who had undergone bariatric surgery. Those without bariatric surgery had a 21% higher rate of developing obesity-related cancers after adjustment for many baseline demographic and clinical features, Dr. Henrique said. The cancer protection after bariatric surgery was especially notable in the subset of patients in the sample with a genetic predisposition to developing cancer.

LABS-1 and LABS-2 were funded by the National Institute of Diabetes and Digestive and Kidney Diseases. Dr. Stroud and Dr. Henrique had no disclosures.

mzoler@mdedge.com

SOURCES: Stroud AM et al. Obesity Week, Abstract A107; Henrique J et al. Obesity Week, Abstract A108.

LAS VEGAS – The ability of bariatric surgery and substantial subsequent weight loss to cut the incidence of a variety of obesity-related cancers and other malignancies received further confirmation in results from two studies reported at a meeting presented by the Obesity Society and the American Society for Metabolic and Bariatric Surgery.

Mitchel L. Zoler/MDedge News

In one study, 2,107 adults enrolled in the Longitudinal Assessment of Bariatric Surgery (LABS-2) study showed a statistically significant halving of the cancer incidence during 7 years of follow-up in patients who underwent bariatric surgery and had a reduction of at least 20% in their presurgical body mass index (BMI), compared with patients in the study who underwent bariatric surgery but lost less weight, reported Andrea M. Stroud, MD, a bariatric surgeon at the Oregon Health & Science University, Portland.

In the second study, analysis of about 1.7 million hospitalized U.S. patients in the National Inpatient Sample showed that the incidence of an obesity-related cancer was 21% higher in more than 1.4 million obese individuals (BMI, 35 kg/m² or greater) with no history of bariatric surgery, compared with nearly 247,000 people in the same database with a history of both obesity and bariatric surgery, said Juliana Henrique, MD, a bariatric surgeon at the Cleveland Clinic Florida in Weston.

The study reported by Dr. Henrique focused specifically on the 13 cancer types identified by the Centers for Disease Control and Prevention as having an incidence that links with overweight and obesity (Morb Mortal Wkly Rep. 2017;66[39]:1052-8), whereas the study presented by Dr. Stroud included all incident cancers during follow-up, but which were predominantly obesity related, with breast cancer – an obesity-related malignancy – having the highest incidence. Overall, 40% of all U.S. cancers in 2014 were obesity related, according to the CDC’s report.

Mitchel L. Zoler/MDedge News

“A number of studies have shown decreases in cancer rates after bariatric surgery, especially female cancers like breast and ovarian,” commented John Scott, MD, director of metabolic and bariatric surgery for Prism Health–Upstate in Greenville, S.C. “These two reports build on that.”

The evidence for weight loss after bariatric surgery as a means to cut the risk of a first or recurrent cancer has become strong enough for some patients to see cancer prophylaxis as a prime reason to undergo the procedure, said surgeons at the meeting.

Bariatric surgery and subsequent weight loss “is a substantial preventive factor for cancer, especially in patients who have obesity and diabetes,” commented Theresa LaMasters, MD, a bariatric surgeon in West Des Moines, Iowa. “It might not just be weight loss. It’s likely a multifactorial effect, including reduced inflammation after bariatric surgery, but weight loss is a component” of the effect, Dr. LaMasters said in an interview. It is now common for her to see patients seeking bariatric surgery because of a family or personal history of cancer. “Patients are trying to reduce their future risk” for cancer with bariatric surgery, she added.

The LABS-2 study enrolled 2,458 patients who were part of the first LABS cohort, LABS-1, but followed them longer term. The data Dr. Stroud reported came from 2,107 of the LABS-2 patients without a history of cancer, no cancer diagnosed in the first year after bariatric surgery, and longer-term follow-up of 7 years. About three-quarters of the patients underwent gastric bypass, with the rest undergoing laparoscopic gastric band placement. Nearly half of those included had diabetes. Their average BMI was 45-50 kg/m².

Dr. Stroud and associates ran an analysis that divided the populations into tertiles based on percentage of baseline body mass lost at 12 months after surgery and cancer-free survival during the 7 years after the 12-month follow-up. The incidence of cancer was 51% lower in patients who lost 20%-34% of their BMI, compared with those who lost less than 20%, a statistically significant difference, and patients who lost 35% or more of their BMI had a 31% reduced cancer rate, compared with those who lost less than 20%, a difference that was not statistically significant, Dr. Stroud reported. The patients who lost less weight after surgery mostly underwent gastric banding, whereas those who lost more mostly underwent gastric bypass.

Mitchel L. Zoler/MDedge News

The analysis reported by Dr. Henrique used data collected in the U.S. National Inpatient Sample during 2010-2014, which totaled more than 7 million patients hospitalized for cancer, including 1,423,367 with a history of obesity and 246,668 with obesity who had undergone bariatric surgery. Those without bariatric surgery had a 21% higher rate of developing obesity-related cancers after adjustment for many baseline demographic and clinical features, Dr. Henrique said. The cancer protection after bariatric surgery was especially notable in the subset of patients in the sample with a genetic predisposition to developing cancer.

LABS-1 and LABS-2 were funded by the National Institute of Diabetes and Digestive and Kidney Diseases. Dr. Stroud and Dr. Henrique had no disclosures.

mzoler@mdedge.com

SOURCES: Stroud AM et al. Obesity Week, Abstract A107; Henrique J et al. Obesity Week, Abstract A108.