IASLC 2020

A new study links the COVID-19 pandemic to decreased lung cancer diagnoses, changes in disease severity, and worsened outcomes for patients with lung cancer.

The two-center study showed a 38% decrease in new lung cancer diagnoses during the pandemic. Patients diagnosed with non–small cell lung cancer (NSCLC) during the pandemic had more severe disease than patients diagnosed prepandemic, but cases of SCLC were not more severe during the pandemic. Still, the 30-day mortality rate nearly doubled for both NSCLC and SCLC patients during the pandemic.

“The prioritization of the health care system towards COVID-19 patients has led to drastic changes in cancer management that could interfere with the initial diagnosis of lung cancer, resulting in delayed treatment and worse outcomes,” said Roxana Reyes, MD, of Hospital Clínic de Barcelona. “Delay of cancer treatment is associated with increased mortality.”

Dr. Reyes and colleagues conducted a retrospective study of the impact of COVID-19 on the incidence of new lung cancer cases, disease severity, and clinical outcomes. Dr. Reyes reported the group’s findings at the 2020 World Conference on Lung Cancer (Abstract 3700), which was rescheduled for January 2021.
 

Study details

Dr. Reyes and colleagues compared data from two tertiary hospitals in Spain in the first 6 months of 2020 with data from the same period in 2019. Spain was one of the countries most affected by COVID-19 during the first wave of the pandemic.

The study’s primary endpoint was differences by period in the number of new lung cancer cases and disease severity. A secondary endpoint was 30-day mortality rate by period and histology.

The study included 162 patients newly diagnosed with lung cancer – 100 diagnosed before the pandemic began and 62 diagnosed during the pandemic. Overall, 68% of patients had NSCLC, and 32% had SCLC.

Baseline characteristics were similar between the prepandemic and pandemic groups, except for the proportion of nonsmokers. Twice as many patients diagnosed during the pandemic were nonsmokers (16% vs. 8%).
 

Differences by time period and subtype

During the pandemic, there was a 38% reduction in all lung cancer diagnoses, a 36% reduction in NSCLC diagnoses, and a 42% reduction in SCLC diagnoses.

Respiratory symptoms were more common during the pandemic for both NSCLC (30% vs. 23%) and SCLC (32% vs. 24%).

Cases of NSCLC diagnosed during the pandemic were more severe, but SCLC cases were not.

In the NSCLC cohort, symptomatic disease was more common during the pandemic (74% vs. 63%), as were advanced disease (58% vs. 46%), more than two metastatic sites (16% vs. 12%), oncologic emergencies (7% vs. 3%), hospitalization (21% vs. 18%), and death during hospitalization (44% vs. 17%).

For SCLC, symptomatic disease was less common during the pandemic (74% vs. 79%), as were advanced disease (52% vs. 67%), more than two metastatic sites (26% vs. 36%), oncologic emergencies (5% vs. 12%), hospitalization (21% vs. 33%), and death during hospitalization (0% vs. 18%).

Nevertheless, the 30-day mortality rate almost doubled during the pandemic for both NSCLC (49% vs. 25%) and SCLC (32% vs. 18%).

For both subtypes together, the median overall survival was 6.7 months during the pandemic and 7.9 months before the pandemic.
 

Implications and next steps

“In our descriptive study, lung cancer diagnosis is being affected during the COVID-19 pandemic,” Dr. Reyes said. “Fewer new lung cancer cases were diagnosed during COVID-19.”

Some patients with acute respiratory infections who tested negative for COVID-19 during the first 6 months of the pandemic may have had undiagnosed lung cancer, noted Matthew Peters, MD, of Concord Repatriation General Hospital and Macquarie University Hospital, both in Sydney, who was not involved in this study.

“They receive a negative result and think their problem is reduced but wonder why they still have a cough,” Dr. Peters said. “The various lockdowns and social distancing reduced the diagnosis of respiratory viral illnesses that often result in an accidental diagnosis of lung cancer. As time goes by, we will recapture harvesting of accidental diagnosis of lung cancer and provide curative treatments.”

Dr. Reyes emphasized that strategies for maintaining cancer diagnoses need to be implemented during the pandemic. She also noted that this study is ongoing, with the goal of assessing the long-term impact of COVID-19.

Dr. Reyes disclosed relationships with Roche, Bristol-Myers Squibb, and Merck Sharp & Dohme. She did not disclose funding for this study. Dr. Peters disclosed relationships with Amgen, AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Eli Lilly, Merck, Novartis, Pfizer, Roche, and Takeda.

A new study links the COVID-19 pandemic to decreased lung cancer diagnoses, changes in disease severity, and worsened outcomes for patients with lung cancer.

The two-center study showed a 38% decrease in new lung cancer diagnoses during the pandemic. Patients diagnosed with non–small cell lung cancer (NSCLC) during the pandemic had more severe disease than patients diagnosed prepandemic, but cases of SCLC were not more severe during the pandemic. Still, the 30-day mortality rate nearly doubled for both NSCLC and SCLC patients during the pandemic.

“The prioritization of the health care system towards COVID-19 patients has led to drastic changes in cancer management that could interfere with the initial diagnosis of lung cancer, resulting in delayed treatment and worse outcomes,” said Roxana Reyes, MD, of Hospital Clínic de Barcelona. “Delay of cancer treatment is associated with increased mortality.”

Dr. Reyes and colleagues conducted a retrospective study of the impact of COVID-19 on the incidence of new lung cancer cases, disease severity, and clinical outcomes. Dr. Reyes reported the group’s findings at the 2020 World Conference on Lung Cancer (Abstract 3700), which was rescheduled for January 2021.
 

Study details

Dr. Reyes and colleagues compared data from two tertiary hospitals in Spain in the first 6 months of 2020 with data from the same period in 2019. Spain was one of the countries most affected by COVID-19 during the first wave of the pandemic.

The study’s primary endpoint was differences by period in the number of new lung cancer cases and disease severity. A secondary endpoint was 30-day mortality rate by period and histology.

The study included 162 patients newly diagnosed with lung cancer – 100 diagnosed before the pandemic began and 62 diagnosed during the pandemic. Overall, 68% of patients had NSCLC, and 32% had SCLC.

Baseline characteristics were similar between the prepandemic and pandemic groups, except for the proportion of nonsmokers. Twice as many patients diagnosed during the pandemic were nonsmokers (16% vs. 8%).
 

Differences by time period and subtype

During the pandemic, there was a 38% reduction in all lung cancer diagnoses, a 36% reduction in NSCLC diagnoses, and a 42% reduction in SCLC diagnoses.

Respiratory symptoms were more common during the pandemic for both NSCLC (30% vs. 23%) and SCLC (32% vs. 24%).

Cases of NSCLC diagnosed during the pandemic were more severe, but SCLC cases were not.

In the NSCLC cohort, symptomatic disease was more common during the pandemic (74% vs. 63%), as were advanced disease (58% vs. 46%), more than two metastatic sites (16% vs. 12%), oncologic emergencies (7% vs. 3%), hospitalization (21% vs. 18%), and death during hospitalization (44% vs. 17%).

For SCLC, symptomatic disease was less common during the pandemic (74% vs. 79%), as were advanced disease (52% vs. 67%), more than two metastatic sites (26% vs. 36%), oncologic emergencies (5% vs. 12%), hospitalization (21% vs. 33%), and death during hospitalization (0% vs. 18%).

Nevertheless, the 30-day mortality rate almost doubled during the pandemic for both NSCLC (49% vs. 25%) and SCLC (32% vs. 18%).

For both subtypes together, the median overall survival was 6.7 months during the pandemic and 7.9 months before the pandemic.
 

Implications and next steps

“In our descriptive study, lung cancer diagnosis is being affected during the COVID-19 pandemic,” Dr. Reyes said. “Fewer new lung cancer cases were diagnosed during COVID-19.”

Some patients with acute respiratory infections who tested negative for COVID-19 during the first 6 months of the pandemic may have had undiagnosed lung cancer, noted Matthew Peters, MD, of Concord Repatriation General Hospital and Macquarie University Hospital, both in Sydney, who was not involved in this study.

“They receive a negative result and think their problem is reduced but wonder why they still have a cough,” Dr. Peters said. “The various lockdowns and social distancing reduced the diagnosis of respiratory viral illnesses that often result in an accidental diagnosis of lung cancer. As time goes by, we will recapture harvesting of accidental diagnosis of lung cancer and provide curative treatments.”

Dr. Reyes emphasized that strategies for maintaining cancer diagnoses need to be implemented during the pandemic. She also noted that this study is ongoing, with the goal of assessing the long-term impact of COVID-19.

Dr. Reyes disclosed relationships with Roche, Bristol-Myers Squibb, and Merck Sharp & Dohme. She did not disclose funding for this study. Dr. Peters disclosed relationships with Amgen, AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Eli Lilly, Merck, Novartis, Pfizer, Roche, and Takeda.

A new study links the COVID-19 pandemic to decreased lung cancer diagnoses, changes in disease severity, and worsened outcomes for patients with lung cancer.

The two-center study showed a 38% decrease in new lung cancer diagnoses during the pandemic. Patients diagnosed with non–small cell lung cancer (NSCLC) during the pandemic had more severe disease than patients diagnosed prepandemic, but cases of SCLC were not more severe during the pandemic. Still, the 30-day mortality rate nearly doubled for both NSCLC and SCLC patients during the pandemic.

“The prioritization of the health care system towards COVID-19 patients has led to drastic changes in cancer management that could interfere with the initial diagnosis of lung cancer, resulting in delayed treatment and worse outcomes,” said Roxana Reyes, MD, of Hospital Clínic de Barcelona. “Delay of cancer treatment is associated with increased mortality.”

Dr. Reyes and colleagues conducted a retrospective study of the impact of COVID-19 on the incidence of new lung cancer cases, disease severity, and clinical outcomes. Dr. Reyes reported the group’s findings at the 2020 World Conference on Lung Cancer (Abstract 3700), which was rescheduled for January 2021.
 

Study details

Dr. Reyes and colleagues compared data from two tertiary hospitals in Spain in the first 6 months of 2020 with data from the same period in 2019. Spain was one of the countries most affected by COVID-19 during the first wave of the pandemic.

The study’s primary endpoint was differences by period in the number of new lung cancer cases and disease severity. A secondary endpoint was 30-day mortality rate by period and histology.

The study included 162 patients newly diagnosed with lung cancer – 100 diagnosed before the pandemic began and 62 diagnosed during the pandemic. Overall, 68% of patients had NSCLC, and 32% had SCLC.

Baseline characteristics were similar between the prepandemic and pandemic groups, except for the proportion of nonsmokers. Twice as many patients diagnosed during the pandemic were nonsmokers (16% vs. 8%).
 

Differences by time period and subtype

During the pandemic, there was a 38% reduction in all lung cancer diagnoses, a 36% reduction in NSCLC diagnoses, and a 42% reduction in SCLC diagnoses.

Respiratory symptoms were more common during the pandemic for both NSCLC (30% vs. 23%) and SCLC (32% vs. 24%).

Cases of NSCLC diagnosed during the pandemic were more severe, but SCLC cases were not.

In the NSCLC cohort, symptomatic disease was more common during the pandemic (74% vs. 63%), as were advanced disease (58% vs. 46%), more than two metastatic sites (16% vs. 12%), oncologic emergencies (7% vs. 3%), hospitalization (21% vs. 18%), and death during hospitalization (44% vs. 17%).

For SCLC, symptomatic disease was less common during the pandemic (74% vs. 79%), as were advanced disease (52% vs. 67%), more than two metastatic sites (26% vs. 36%), oncologic emergencies (5% vs. 12%), hospitalization (21% vs. 33%), and death during hospitalization (0% vs. 18%).

Nevertheless, the 30-day mortality rate almost doubled during the pandemic for both NSCLC (49% vs. 25%) and SCLC (32% vs. 18%).

For both subtypes together, the median overall survival was 6.7 months during the pandemic and 7.9 months before the pandemic.
 

Implications and next steps

“In our descriptive study, lung cancer diagnosis is being affected during the COVID-19 pandemic,” Dr. Reyes said. “Fewer new lung cancer cases were diagnosed during COVID-19.”

Some patients with acute respiratory infections who tested negative for COVID-19 during the first 6 months of the pandemic may have had undiagnosed lung cancer, noted Matthew Peters, MD, of Concord Repatriation General Hospital and Macquarie University Hospital, both in Sydney, who was not involved in this study.

“They receive a negative result and think their problem is reduced but wonder why they still have a cough,” Dr. Peters said. “The various lockdowns and social distancing reduced the diagnosis of respiratory viral illnesses that often result in an accidental diagnosis of lung cancer. As time goes by, we will recapture harvesting of accidental diagnosis of lung cancer and provide curative treatments.”

Dr. Reyes emphasized that strategies for maintaining cancer diagnoses need to be implemented during the pandemic. She also noted that this study is ongoing, with the goal of assessing the long-term impact of COVID-19.

Dr. Reyes disclosed relationships with Roche, Bristol-Myers Squibb, and Merck Sharp & Dohme. She did not disclose funding for this study. Dr. Peters disclosed relationships with Amgen, AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Eli Lilly, Merck, Novartis, Pfizer, Roche, and Takeda.

The investigational anti-PD-1 antibody sintilimab (Tyvyt, Innovent Biologics and Eli Lilly) has shown that it improves the efficacy of platinum-based chemotherapy in the first-line treatment of patients with advanced nonsquamous non–small cell lung cancer (NSCLC) in a phase 3 trial dubbed ORIENT-11.

The study was presented at the World Congress on Lung Cancer 2020 Virtual Presidential Symposium, held virtually due to the COVID-19 pandemic, on August 8. It was also published simultaneously in the Journal of Thoracic Oncology.

Sintilimab is a fully human IgG4 monoclonal antibody that blocks the binding of programmed death (PD)-1 to PD-ligand 1 (PD-L1) or PD-L2 with high affinity, and has received market authorization in China for the treatment of Hodgkin lymphoma.

For ORIENT-11, almost 400 patients with advanced nonsquamous NSCLC were randomly assigned to sintilimab or placebo plus pemetrexed and platinum-based chemotherapy in a 2:1 ratio.

“The addition of sintilimab to pemetrexed and platinum significantly improved PFS [progression-free survival], compared to placebo,” reducing progression rates by 52%, noted lead investigator Li Zhang, MD, professor of medical oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China.

Crucially, this benefit “was seen across key clinical subgroups,” he added.

He noted that the overall response rate “was also improved, with a durable response,” while the results, which are not yet mature, suggest the experimental arm was associated with an overall survival (OS) benefit.

Study discussant Misako Nagasaka, MD, a thoracic oncologist and clinical investigator at Karmanos Cancer Institute, Detroit, said that the PFS benefit seen in the study is “certainly encouraging.”

Adding a note of caution, she continued: “But we have seen studies with PFS improvement which did not translate into OS improvement.

“Longer follow-up would allow events to mature and we will ultimately see if there would be a significant OS benefit,” she said.

Dr. Nagasaka also pointed out that the greater benefit with sintilimab seen in patients with high PD-L1 begs the question as to what would be the preferred regimen in those with higher or lower expression.

And, she said, this is not just about what regimen to choose but “more importantly, why?”

“Perhaps you’d like to use something with the best response rate, perhaps you’re sticking to a single agent immunotherapy because the toxicity profile is more favorable, or perhaps you [are] convinced with a certain regimen because of the robust PFS and OS data,” she said.

“Whatever you chose, there was a reason for your choice,” she said, adding that the sintilimab combination would have to “fulfill those reasons for you to consider choosing this regimen.”

Study details

Dr. Zhang began his presentation by noting that previous phase 1b studies have shown that sintilimab plus pemetrexed and platinum-based chemotherapy has a “tolerable safety profile and promising efficacy” in previously untreated non-squamous NSCLC.

They therefore conducted ORIENT-11, a randomized, double-blind, phase 3 study involving 397 patients with untreated stage IIIB/C or IV nonsquamous NSCLC who had neither EGFR nor ALK gene alterations.

The patients were randomly assigned in a 2:1 fashion to sintilimab plus pemetrexed and platinum-based chemotherapy (n = 266) or placebo plus pemetrexed and chemo (n = 131) for four cycles, followed by sintilimab or placebo plus pemetrexed for up to 24 months.

Thirty-five patients in the placebo arm crossed over to sintilimab monotherapy, representing 31.3% of the intention-to-treat population.

At the data cutoff of Nov. 15, 2019, 198 events had occurred, at a median follow-up of 8.9 months.

The team found that median PFS was significantly higher with sintilimab than placebo combination therapy, at 8.9 months vs. 5.0 months, or a hazard ratio of 0.482 (P < .00001).

Dr. Zhang noted that the benefit with sintilimab plus pemetrexed and platinum-based chemotherapy was seen across all subgroups.

However, it was notable that the impact of adding sintilimab on PFS was greater in patients with a tumor proportion score (TPS) ≥50%.

The HR for progression vs. the placebo treatment arm was 0.310, with median PFS not reached, which decreased to 0.503 in patients with a TPS of 1%-49% and 0.664 among those with a TPS <1%.

The results also showed that there was a “nominally significant improvement” in overall survival with sintilimab versus placebo, at a HR of 0.609 (P = 0.01921).

The ORR was markedly different between the sintilimab and placebo groups, at 51.9% vs. 29.8%, with the duration of response not reached in the sintilimab arm compared with 5.5 months in the placebo arm.

The sintilimab arm included three (1.1%) complete responses, which was not observed with pemetrexed and platinum-based chemotherapy alone.

Finally, Dr. Zhang observed that the safety profiles of the sintilimab and placebo arms were similar, with comparable rates of any, grade 3-5, and serious adverse events largely driven by high rates of chemotherapy-related events.

While there were fewer adverse events that led to death with sintilimab, at 2.3% vs. 6.9% with placebo, there were, as expected, more immune-related adverse events, at 43.2% vs. 36.6%, respectively.

Comparison with pembrolizumab

In her discussion, Dr. Nagasaka said that the first question that came to mind when she saw the results was: “How does the ORIENT-11 data compare with KEYNOTE-189?”

For that study, pembrolizumab (Keytruda, Merck) was added to pemetrexed plus carboplatin chemotherapy and compared with standard of care alone in patients with untreated metastatic nonsquamous NSCLC.

As reported by Medscape Medical News, pembrolizumab was associated with a 48% reduced risk of disease progression, as well as improved overall survival.

Dr. Nagasaka said that ORIENT-11 “had patients that tended to be younger, there were more males, more with performance status 1, and those who had never smoked” than those in KEYNOTE-189.

“But most importantly, KEYNOTE-189 had a very small number of patients from East Asia, only 1% in the pembro arm and 2.9% in the placebo arm.”

In contrast, all the patients included in ORIENT-11 were from East Asia, making the study of “high importance.”

She added that, “while across-trial comparisons must be taken with caution, the medium PFS of ORIENT-11 ... appears comparable to those of KEYNOTE-189,” while the HR “appears identical.”

This is despite median follow-up time in ORIENT-11 of “only” 8.9 months vs. a median of 23.1 months in the updated KEYNOTE-189 data.

There are plans to register the sintilimab combination therapy in China for the treatment of nonsquamous NSCLC, where it will go up against pembrolizumab as well as, potentially, tislelizumab (BeiGene).

The study was sponsored by Innovent Biologics and Eli Lilly. Dr. Zhang disclosed research grants from Eli Lilly and Pfizer. Dr. Nagasaka disclosed serving on the advisory boards of AstraZeneca, Daiichi Sankyo, Takeda, Novartis, and EMD Serono; as a consultant for Caris Life Sciences; and receiving travel support from An Hearts Therapeutics.

This article first appeared on Medscape.com.

The investigational anti-PD-1 antibody sintilimab (Tyvyt, Innovent Biologics and Eli Lilly) has shown that it improves the efficacy of platinum-based chemotherapy in the first-line treatment of patients with advanced nonsquamous non–small cell lung cancer (NSCLC) in a phase 3 trial dubbed ORIENT-11.

The study was presented at the World Congress on Lung Cancer 2020 Virtual Presidential Symposium, held virtually due to the COVID-19 pandemic, on August 8. It was also published simultaneously in the Journal of Thoracic Oncology.

Sintilimab is a fully human IgG4 monoclonal antibody that blocks the binding of programmed death (PD)-1 to PD-ligand 1 (PD-L1) or PD-L2 with high affinity, and has received market authorization in China for the treatment of Hodgkin lymphoma.

For ORIENT-11, almost 400 patients with advanced nonsquamous NSCLC were randomly assigned to sintilimab or placebo plus pemetrexed and platinum-based chemotherapy in a 2:1 ratio.

“The addition of sintilimab to pemetrexed and platinum significantly improved PFS [progression-free survival], compared to placebo,” reducing progression rates by 52%, noted lead investigator Li Zhang, MD, professor of medical oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China.

Crucially, this benefit “was seen across key clinical subgroups,” he added.

He noted that the overall response rate “was also improved, with a durable response,” while the results, which are not yet mature, suggest the experimental arm was associated with an overall survival (OS) benefit.

Study discussant Misako Nagasaka, MD, a thoracic oncologist and clinical investigator at Karmanos Cancer Institute, Detroit, said that the PFS benefit seen in the study is “certainly encouraging.”

Adding a note of caution, she continued: “But we have seen studies with PFS improvement which did not translate into OS improvement.

“Longer follow-up would allow events to mature and we will ultimately see if there would be a significant OS benefit,” she said.

Dr. Nagasaka also pointed out that the greater benefit with sintilimab seen in patients with high PD-L1 begs the question as to what would be the preferred regimen in those with higher or lower expression.

And, she said, this is not just about what regimen to choose but “more importantly, why?”

“Perhaps you’d like to use something with the best response rate, perhaps you’re sticking to a single agent immunotherapy because the toxicity profile is more favorable, or perhaps you [are] convinced with a certain regimen because of the robust PFS and OS data,” she said.

“Whatever you chose, there was a reason for your choice,” she said, adding that the sintilimab combination would have to “fulfill those reasons for you to consider choosing this regimen.”

Study details

Dr. Zhang began his presentation by noting that previous phase 1b studies have shown that sintilimab plus pemetrexed and platinum-based chemotherapy has a “tolerable safety profile and promising efficacy” in previously untreated non-squamous NSCLC.

They therefore conducted ORIENT-11, a randomized, double-blind, phase 3 study involving 397 patients with untreated stage IIIB/C or IV nonsquamous NSCLC who had neither EGFR nor ALK gene alterations.

The patients were randomly assigned in a 2:1 fashion to sintilimab plus pemetrexed and platinum-based chemotherapy (n = 266) or placebo plus pemetrexed and chemo (n = 131) for four cycles, followed by sintilimab or placebo plus pemetrexed for up to 24 months.

Thirty-five patients in the placebo arm crossed over to sintilimab monotherapy, representing 31.3% of the intention-to-treat population.

At the data cutoff of Nov. 15, 2019, 198 events had occurred, at a median follow-up of 8.9 months.

The team found that median PFS was significantly higher with sintilimab than placebo combination therapy, at 8.9 months vs. 5.0 months, or a hazard ratio of 0.482 (P < .00001).

Dr. Zhang noted that the benefit with sintilimab plus pemetrexed and platinum-based chemotherapy was seen across all subgroups.

However, it was notable that the impact of adding sintilimab on PFS was greater in patients with a tumor proportion score (TPS) ≥50%.

The HR for progression vs. the placebo treatment arm was 0.310, with median PFS not reached, which decreased to 0.503 in patients with a TPS of 1%-49% and 0.664 among those with a TPS <1%.

The results also showed that there was a “nominally significant improvement” in overall survival with sintilimab versus placebo, at a HR of 0.609 (P = 0.01921).

The ORR was markedly different between the sintilimab and placebo groups, at 51.9% vs. 29.8%, with the duration of response not reached in the sintilimab arm compared with 5.5 months in the placebo arm.

The sintilimab arm included three (1.1%) complete responses, which was not observed with pemetrexed and platinum-based chemotherapy alone.

Finally, Dr. Zhang observed that the safety profiles of the sintilimab and placebo arms were similar, with comparable rates of any, grade 3-5, and serious adverse events largely driven by high rates of chemotherapy-related events.

While there were fewer adverse events that led to death with sintilimab, at 2.3% vs. 6.9% with placebo, there were, as expected, more immune-related adverse events, at 43.2% vs. 36.6%, respectively.

Comparison with pembrolizumab

In her discussion, Dr. Nagasaka said that the first question that came to mind when she saw the results was: “How does the ORIENT-11 data compare with KEYNOTE-189?”

For that study, pembrolizumab (Keytruda, Merck) was added to pemetrexed plus carboplatin chemotherapy and compared with standard of care alone in patients with untreated metastatic nonsquamous NSCLC.

As reported by Medscape Medical News, pembrolizumab was associated with a 48% reduced risk of disease progression, as well as improved overall survival.

Dr. Nagasaka said that ORIENT-11 “had patients that tended to be younger, there were more males, more with performance status 1, and those who had never smoked” than those in KEYNOTE-189.

“But most importantly, KEYNOTE-189 had a very small number of patients from East Asia, only 1% in the pembro arm and 2.9% in the placebo arm.”

In contrast, all the patients included in ORIENT-11 were from East Asia, making the study of “high importance.”

She added that, “while across-trial comparisons must be taken with caution, the medium PFS of ORIENT-11 ... appears comparable to those of KEYNOTE-189,” while the HR “appears identical.”

This is despite median follow-up time in ORIENT-11 of “only” 8.9 months vs. a median of 23.1 months in the updated KEYNOTE-189 data.

There are plans to register the sintilimab combination therapy in China for the treatment of nonsquamous NSCLC, where it will go up against pembrolizumab as well as, potentially, tislelizumab (BeiGene).

The study was sponsored by Innovent Biologics and Eli Lilly. Dr. Zhang disclosed research grants from Eli Lilly and Pfizer. Dr. Nagasaka disclosed serving on the advisory boards of AstraZeneca, Daiichi Sankyo, Takeda, Novartis, and EMD Serono; as a consultant for Caris Life Sciences; and receiving travel support from An Hearts Therapeutics.

This article first appeared on Medscape.com.

The investigational anti-PD-1 antibody sintilimab (Tyvyt, Innovent Biologics and Eli Lilly) has shown that it improves the efficacy of platinum-based chemotherapy in the first-line treatment of patients with advanced nonsquamous non–small cell lung cancer (NSCLC) in a phase 3 trial dubbed ORIENT-11.

The study was presented at the World Congress on Lung Cancer 2020 Virtual Presidential Symposium, held virtually due to the COVID-19 pandemic, on August 8. It was also published simultaneously in the Journal of Thoracic Oncology.

Sintilimab is a fully human IgG4 monoclonal antibody that blocks the binding of programmed death (PD)-1 to PD-ligand 1 (PD-L1) or PD-L2 with high affinity, and has received market authorization in China for the treatment of Hodgkin lymphoma.

For ORIENT-11, almost 400 patients with advanced nonsquamous NSCLC were randomly assigned to sintilimab or placebo plus pemetrexed and platinum-based chemotherapy in a 2:1 ratio.

“The addition of sintilimab to pemetrexed and platinum significantly improved PFS [progression-free survival], compared to placebo,” reducing progression rates by 52%, noted lead investigator Li Zhang, MD, professor of medical oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China.

Crucially, this benefit “was seen across key clinical subgroups,” he added.

He noted that the overall response rate “was also improved, with a durable response,” while the results, which are not yet mature, suggest the experimental arm was associated with an overall survival (OS) benefit.

Study discussant Misako Nagasaka, MD, a thoracic oncologist and clinical investigator at Karmanos Cancer Institute, Detroit, said that the PFS benefit seen in the study is “certainly encouraging.”

Adding a note of caution, she continued: “But we have seen studies with PFS improvement which did not translate into OS improvement.

“Longer follow-up would allow events to mature and we will ultimately see if there would be a significant OS benefit,” she said.

Dr. Nagasaka also pointed out that the greater benefit with sintilimab seen in patients with high PD-L1 begs the question as to what would be the preferred regimen in those with higher or lower expression.

And, she said, this is not just about what regimen to choose but “more importantly, why?”

“Perhaps you’d like to use something with the best response rate, perhaps you’re sticking to a single agent immunotherapy because the toxicity profile is more favorable, or perhaps you [are] convinced with a certain regimen because of the robust PFS and OS data,” she said.

“Whatever you chose, there was a reason for your choice,” she said, adding that the sintilimab combination would have to “fulfill those reasons for you to consider choosing this regimen.”

Study details

Dr. Zhang began his presentation by noting that previous phase 1b studies have shown that sintilimab plus pemetrexed and platinum-based chemotherapy has a “tolerable safety profile and promising efficacy” in previously untreated non-squamous NSCLC.

They therefore conducted ORIENT-11, a randomized, double-blind, phase 3 study involving 397 patients with untreated stage IIIB/C or IV nonsquamous NSCLC who had neither EGFR nor ALK gene alterations.

The patients were randomly assigned in a 2:1 fashion to sintilimab plus pemetrexed and platinum-based chemotherapy (n = 266) or placebo plus pemetrexed and chemo (n = 131) for four cycles, followed by sintilimab or placebo plus pemetrexed for up to 24 months.

Thirty-five patients in the placebo arm crossed over to sintilimab monotherapy, representing 31.3% of the intention-to-treat population.

At the data cutoff of Nov. 15, 2019, 198 events had occurred, at a median follow-up of 8.9 months.

The team found that median PFS was significantly higher with sintilimab than placebo combination therapy, at 8.9 months vs. 5.0 months, or a hazard ratio of 0.482 (P < .00001).

Dr. Zhang noted that the benefit with sintilimab plus pemetrexed and platinum-based chemotherapy was seen across all subgroups.

However, it was notable that the impact of adding sintilimab on PFS was greater in patients with a tumor proportion score (TPS) ≥50%.

The HR for progression vs. the placebo treatment arm was 0.310, with median PFS not reached, which decreased to 0.503 in patients with a TPS of 1%-49% and 0.664 among those with a TPS <1%.

The results also showed that there was a “nominally significant improvement” in overall survival with sintilimab versus placebo, at a HR of 0.609 (P = 0.01921).

The ORR was markedly different between the sintilimab and placebo groups, at 51.9% vs. 29.8%, with the duration of response not reached in the sintilimab arm compared with 5.5 months in the placebo arm.

The sintilimab arm included three (1.1%) complete responses, which was not observed with pemetrexed and platinum-based chemotherapy alone.

Finally, Dr. Zhang observed that the safety profiles of the sintilimab and placebo arms were similar, with comparable rates of any, grade 3-5, and serious adverse events largely driven by high rates of chemotherapy-related events.

While there were fewer adverse events that led to death with sintilimab, at 2.3% vs. 6.9% with placebo, there were, as expected, more immune-related adverse events, at 43.2% vs. 36.6%, respectively.

Comparison with pembrolizumab

In her discussion, Dr. Nagasaka said that the first question that came to mind when she saw the results was: “How does the ORIENT-11 data compare with KEYNOTE-189?”

For that study, pembrolizumab (Keytruda, Merck) was added to pemetrexed plus carboplatin chemotherapy and compared with standard of care alone in patients with untreated metastatic nonsquamous NSCLC.

As reported by Medscape Medical News, pembrolizumab was associated with a 48% reduced risk of disease progression, as well as improved overall survival.

Dr. Nagasaka said that ORIENT-11 “had patients that tended to be younger, there were more males, more with performance status 1, and those who had never smoked” than those in KEYNOTE-189.

“But most importantly, KEYNOTE-189 had a very small number of patients from East Asia, only 1% in the pembro arm and 2.9% in the placebo arm.”

In contrast, all the patients included in ORIENT-11 were from East Asia, making the study of “high importance.”

She added that, “while across-trial comparisons must be taken with caution, the medium PFS of ORIENT-11 ... appears comparable to those of KEYNOTE-189,” while the HR “appears identical.”

This is despite median follow-up time in ORIENT-11 of “only” 8.9 months vs. a median of 23.1 months in the updated KEYNOTE-189 data.

There are plans to register the sintilimab combination therapy in China for the treatment of nonsquamous NSCLC, where it will go up against pembrolizumab as well as, potentially, tislelizumab (BeiGene).

The study was sponsored by Innovent Biologics and Eli Lilly. Dr. Zhang disclosed research grants from Eli Lilly and Pfizer. Dr. Nagasaka disclosed serving on the advisory boards of AstraZeneca, Daiichi Sankyo, Takeda, Novartis, and EMD Serono; as a consultant for Caris Life Sciences; and receiving travel support from An Hearts Therapeutics.

This article first appeared on Medscape.com.

Patients with untreated mesothelioma may be able to avoid chemotherapy, say researchers reporting new survival data with the immunotherapy combination of nivolumab (Opdivo) and ipilimumab (Yervoy).

The two approaches were compared in more than 600 patients with treatment-naive mesothelioma in the phase 3 CheckMate 743 trial, which was supported by the manufacturer of both immunotherapies, Bristol-Myers Squibb.

The trial “met its primary endpoint of statistically improving overall survival for the experimental arm vs chemotherapy in a prespecified interim analysis,” reported Paul Baas, MD, PhD, Netherlands Cancer Institute, Amsterdam, The Netherlands,

The combined nivo+ipi immunotherapy regimen was associated with a 26% improvement in overall survival. At 2 years, 41% of patients in the immunotherapy arm were still alive, vs 27% in the chemotherapy group.

“This is the first positive randomized trial of dual immunotherapy in the first-line treatment of patients with mesothelioma,” he said. He suggested that it should therefore “be considered as a new standard of care.”

The data were presented on August 8 in the presidential symposium of the World Congress on Lung Cancer 2020, which was held online because of the COVID-19 pandemic.

A key analysis for the study was by histologic subgroup. It is known that standard-of-care chemotherapy performs better in patients with epithelioid as opposed to nonepithelioid tumor subtypes.

Bass highlighted that the performance of nivo+ipi was “almost the same” in patients with epithelioid and nonepithelioid tumors, at a median overall survival of 18.7 months and 18.1 months, respectively.

In contrast, overall survival in the chemotherapy arm was markedly lower in patients with nonepithelioid tumors, at 8.8 months vs 16.5 months among those with epithelioid tumors.

This was reflected in the hazard ratios for overall survival vs nivo+ipi, at 0.46 and 0.86, respectively, the latter nonsignificantly different from combination immunotherapy.

For study discussant Dean A. Fennell, MD, PhD, professor and consultant in thoracic medical oncology, University of Leicester, United Kingdom, the epithet of a “new standard of care” for nivo+ipi should be reserved for nonepithelioid disease.

In this setting, he described the overall survival improvement as “transformative,” considering the “marked chemo resistance” of nonepithelioid tumors, which is “almost certainly” associated with epithelial-to-mesenchymal transition (EMT).

In the future, he suggested, combinations of chemotherapy and immunotherapy involving all histologies or selective targeting of nonepithelioid mesothelioma “could further extend the benefit for patients.”
 

Improving survival in mesothelioma

“We have been trying to improve the overall survival of patients with mesothelioma now for many decades,” Bass commented. Platinum-based chemotherapy plus pemetrexed is a standard of care, although the 5-year survival rate «is still below 10%,” he noted.

Randomized trials of single-agent immune checkpoint inhibitor therapy in the second-line treatment of patients with mesothelioma have not shown any significant benefits.

However, nivolumab and ipilimumab have a “complementary mechanism of action,” and two previous reports have indicated that together, they have clinical activity in the second-line setting.

The team conducted CheckMate 743 to determine the efficacy of the combination in the first-line setting.

The study involved 605 patients with pleural mesothelioma who had received no prior systemic therapy and had good performance status.

They were randomly assigned in a 1:1 ratio to receive nivo+ipi for up to 2 years or six cycles of pemetrexed plus cisplatin or carboplatin until disease progression or unacceptable toxicity occurred.

“Patients could have a subsequent therapy,” Bass noted; 44.0% of patients in the experimental arm received subsequent therapy, vs 44.1% of those in the chemotherapy arm.

Of the latter, 20% received an immune checkpoint inhibitor as subsequent therapy.

The minimum follow-up for overall survival was 22.1 months; the median follow-up was 29.7 months.

Nivo+ipi was associated with a significant improvement in overall survival vs standard-of-care chemotherapy, at a median overall survival of 18.1 months vs 14.1 months, with a hazard ratio of 0.74 (P = .0020).

The results indicated that overall survival was similar across key subgroups, which suggests that “no subgroup was harmed” by nivo+ipi, Bass said.
 

Stratification by PD-LI expression

Stratifying the patients by the absence or presence of programmed cell death–ligand-1 (PD-L1) expression, the team found that the performance of nivo+ipi was “the same” as that of chemotherapy, Bass said.

“But in cases where there is any expression of PD-L1, the experimental arm performs better,” at an overall survival 18.0 months vs 13.3 months for chemotherapy and a hazard ratio of 0.69, he said.

There was no difference between the two treatment arms in progression-free survival. Chemotherapy performed better in the first 6 months of treatment, after which the nivo+ipi arm had lower event rates.

Nivo+ipi was also associated with a greater duration of response, at a median of 11.0 months vs 6.7 months for standard-of-care chemotherapy.

Moreover, at 24 months, 32% of nivo+ipi patients were still experiencing a response, whereas 8% of those in the chemotherapy arm were.

Treatment-related adverse events rates were almost identical between the two treatment groups, although treatment with nivo+ipi was associated with more grade 3/4 serious treatment-related adverse events, at 15 vs six for chemotherapy.
 

Choosing immunotherapy vs. chemotherapy

In his discussion of the new study, Fennell compared the current results with those from two studies, INITIATE and MAPS2. “What’s very clear is the response rate is slightly higher,” as is the disease control rate, he said.

This, he explained, “is perhaps not surprising, given that these two previous trials were in the relapse setting.”

He pointed out, however, that the progression-free survival data from those previous trials were “not a million miles away” from results seen in CheckMate 743, “suggesting that this immunotherapy does have significant activity in the relapse setting.”

For Fennell, the “pivotal data” are in patients with nonepithelioid tumors, particularly inasmuch as chemotherapy performed “poorly” in this setting, whereas it performs “as expected” in epithelioid mesothelioma.

He believes that the driver for this is the poor prognosis associated with sarcomatoid biphasic disease, a subtype characterized by increased expression of vimentin and ZEB1, proteins both associated with EMT.

“What does this mean?” Fennell asked.

“If you have have enrichment of EMT, what you see is increased drug resistance, increased invasiveness, something we know well with sarcomatoid mesotheliomas in particular, and this drug-resistance phenotype may account for the drug resistance that we see in CheckMate 743 with chemotherapy.

“This does not appear, however, to impact in any way the efficacy of the immunotherapy,” he noted.

Fennell believes that, with regard to both efficacy and safety, the balance is “very much in favor” of nivo+ipi in epithelioid mesothelioma, although there is less to choose between immunotherapy and chemotherapy in the nonepithelioid setting.

Indeed, the choice is “possible tilting slightly towards chemotherapy” in patients with the nonepithelioid tumors, owing to the lower rates of grade 3/4 serious treatment-related adverse events in comparison with combination immunotherapy.

The study was supported by Bristol-Myers Squibb. Bass has served on the advisory boards of MSD, AstraZeneca, and Takeda. Fennell has received research support from AstraZeneca, Bristol-Myers Squibb, Clovis Oncology, Eli Lilly, MSD, and Roche; research funding from Astex Therapeutics, Bayer, and Boehringer Ingelheim; has served on the speaker bureau of AstraZeneca, Boehringer Ingelheim, and Roche; has acted as a consultant for Bayer and Lab 21; and has served on the advisory board of Atara Biotherapeutics, Boehringer Ingelheim, and Inventiva.

This article first appeared on Medscape.com.

Patients with untreated mesothelioma may be able to avoid chemotherapy, say researchers reporting new survival data with the immunotherapy combination of nivolumab (Opdivo) and ipilimumab (Yervoy).

The two approaches were compared in more than 600 patients with treatment-naive mesothelioma in the phase 3 CheckMate 743 trial, which was supported by the manufacturer of both immunotherapies, Bristol-Myers Squibb.

The trial “met its primary endpoint of statistically improving overall survival for the experimental arm vs chemotherapy in a prespecified interim analysis,” reported Paul Baas, MD, PhD, Netherlands Cancer Institute, Amsterdam, The Netherlands,

The combined nivo+ipi immunotherapy regimen was associated with a 26% improvement in overall survival. At 2 years, 41% of patients in the immunotherapy arm were still alive, vs 27% in the chemotherapy group.

“This is the first positive randomized trial of dual immunotherapy in the first-line treatment of patients with mesothelioma,” he said. He suggested that it should therefore “be considered as a new standard of care.”

The data were presented on August 8 in the presidential symposium of the World Congress on Lung Cancer 2020, which was held online because of the COVID-19 pandemic.

A key analysis for the study was by histologic subgroup. It is known that standard-of-care chemotherapy performs better in patients with epithelioid as opposed to nonepithelioid tumor subtypes.

Bass highlighted that the performance of nivo+ipi was “almost the same” in patients with epithelioid and nonepithelioid tumors, at a median overall survival of 18.7 months and 18.1 months, respectively.

In contrast, overall survival in the chemotherapy arm was markedly lower in patients with nonepithelioid tumors, at 8.8 months vs 16.5 months among those with epithelioid tumors.

This was reflected in the hazard ratios for overall survival vs nivo+ipi, at 0.46 and 0.86, respectively, the latter nonsignificantly different from combination immunotherapy.

For study discussant Dean A. Fennell, MD, PhD, professor and consultant in thoracic medical oncology, University of Leicester, United Kingdom, the epithet of a “new standard of care” for nivo+ipi should be reserved for nonepithelioid disease.

In this setting, he described the overall survival improvement as “transformative,” considering the “marked chemo resistance” of nonepithelioid tumors, which is “almost certainly” associated with epithelial-to-mesenchymal transition (EMT).

In the future, he suggested, combinations of chemotherapy and immunotherapy involving all histologies or selective targeting of nonepithelioid mesothelioma “could further extend the benefit for patients.”
 

Improving survival in mesothelioma

“We have been trying to improve the overall survival of patients with mesothelioma now for many decades,” Bass commented. Platinum-based chemotherapy plus pemetrexed is a standard of care, although the 5-year survival rate «is still below 10%,” he noted.

Randomized trials of single-agent immune checkpoint inhibitor therapy in the second-line treatment of patients with mesothelioma have not shown any significant benefits.

However, nivolumab and ipilimumab have a “complementary mechanism of action,” and two previous reports have indicated that together, they have clinical activity in the second-line setting.

The team conducted CheckMate 743 to determine the efficacy of the combination in the first-line setting.

The study involved 605 patients with pleural mesothelioma who had received no prior systemic therapy and had good performance status.

They were randomly assigned in a 1:1 ratio to receive nivo+ipi for up to 2 years or six cycles of pemetrexed plus cisplatin or carboplatin until disease progression or unacceptable toxicity occurred.

“Patients could have a subsequent therapy,” Bass noted; 44.0% of patients in the experimental arm received subsequent therapy, vs 44.1% of those in the chemotherapy arm.

Of the latter, 20% received an immune checkpoint inhibitor as subsequent therapy.

The minimum follow-up for overall survival was 22.1 months; the median follow-up was 29.7 months.

Nivo+ipi was associated with a significant improvement in overall survival vs standard-of-care chemotherapy, at a median overall survival of 18.1 months vs 14.1 months, with a hazard ratio of 0.74 (P = .0020).

The results indicated that overall survival was similar across key subgroups, which suggests that “no subgroup was harmed” by nivo+ipi, Bass said.
 

Stratification by PD-LI expression

Stratifying the patients by the absence or presence of programmed cell death–ligand-1 (PD-L1) expression, the team found that the performance of nivo+ipi was “the same” as that of chemotherapy, Bass said.

“But in cases where there is any expression of PD-L1, the experimental arm performs better,” at an overall survival 18.0 months vs 13.3 months for chemotherapy and a hazard ratio of 0.69, he said.

There was no difference between the two treatment arms in progression-free survival. Chemotherapy performed better in the first 6 months of treatment, after which the nivo+ipi arm had lower event rates.

Nivo+ipi was also associated with a greater duration of response, at a median of 11.0 months vs 6.7 months for standard-of-care chemotherapy.

Moreover, at 24 months, 32% of nivo+ipi patients were still experiencing a response, whereas 8% of those in the chemotherapy arm were.

Treatment-related adverse events rates were almost identical between the two treatment groups, although treatment with nivo+ipi was associated with more grade 3/4 serious treatment-related adverse events, at 15 vs six for chemotherapy.
 

Choosing immunotherapy vs. chemotherapy

In his discussion of the new study, Fennell compared the current results with those from two studies, INITIATE and MAPS2. “What’s very clear is the response rate is slightly higher,” as is the disease control rate, he said.

This, he explained, “is perhaps not surprising, given that these two previous trials were in the relapse setting.”

He pointed out, however, that the progression-free survival data from those previous trials were “not a million miles away” from results seen in CheckMate 743, “suggesting that this immunotherapy does have significant activity in the relapse setting.”

For Fennell, the “pivotal data” are in patients with nonepithelioid tumors, particularly inasmuch as chemotherapy performed “poorly” in this setting, whereas it performs “as expected” in epithelioid mesothelioma.

He believes that the driver for this is the poor prognosis associated with sarcomatoid biphasic disease, a subtype characterized by increased expression of vimentin and ZEB1, proteins both associated with EMT.

“What does this mean?” Fennell asked.

“If you have have enrichment of EMT, what you see is increased drug resistance, increased invasiveness, something we know well with sarcomatoid mesotheliomas in particular, and this drug-resistance phenotype may account for the drug resistance that we see in CheckMate 743 with chemotherapy.

“This does not appear, however, to impact in any way the efficacy of the immunotherapy,” he noted.

Fennell believes that, with regard to both efficacy and safety, the balance is “very much in favor” of nivo+ipi in epithelioid mesothelioma, although there is less to choose between immunotherapy and chemotherapy in the nonepithelioid setting.

Indeed, the choice is “possible tilting slightly towards chemotherapy” in patients with the nonepithelioid tumors, owing to the lower rates of grade 3/4 serious treatment-related adverse events in comparison with combination immunotherapy.

The study was supported by Bristol-Myers Squibb. Bass has served on the advisory boards of MSD, AstraZeneca, and Takeda. Fennell has received research support from AstraZeneca, Bristol-Myers Squibb, Clovis Oncology, Eli Lilly, MSD, and Roche; research funding from Astex Therapeutics, Bayer, and Boehringer Ingelheim; has served on the speaker bureau of AstraZeneca, Boehringer Ingelheim, and Roche; has acted as a consultant for Bayer and Lab 21; and has served on the advisory board of Atara Biotherapeutics, Boehringer Ingelheim, and Inventiva.

This article first appeared on Medscape.com.

Patients with untreated mesothelioma may be able to avoid chemotherapy, say researchers reporting new survival data with the immunotherapy combination of nivolumab (Opdivo) and ipilimumab (Yervoy).

The two approaches were compared in more than 600 patients with treatment-naive mesothelioma in the phase 3 CheckMate 743 trial, which was supported by the manufacturer of both immunotherapies, Bristol-Myers Squibb.

The trial “met its primary endpoint of statistically improving overall survival for the experimental arm vs chemotherapy in a prespecified interim analysis,” reported Paul Baas, MD, PhD, Netherlands Cancer Institute, Amsterdam, The Netherlands,

The combined nivo+ipi immunotherapy regimen was associated with a 26% improvement in overall survival. At 2 years, 41% of patients in the immunotherapy arm were still alive, vs 27% in the chemotherapy group.

“This is the first positive randomized trial of dual immunotherapy in the first-line treatment of patients with mesothelioma,” he said. He suggested that it should therefore “be considered as a new standard of care.”

The data were presented on August 8 in the presidential symposium of the World Congress on Lung Cancer 2020, which was held online because of the COVID-19 pandemic.

A key analysis for the study was by histologic subgroup. It is known that standard-of-care chemotherapy performs better in patients with epithelioid as opposed to nonepithelioid tumor subtypes.

Bass highlighted that the performance of nivo+ipi was “almost the same” in patients with epithelioid and nonepithelioid tumors, at a median overall survival of 18.7 months and 18.1 months, respectively.

In contrast, overall survival in the chemotherapy arm was markedly lower in patients with nonepithelioid tumors, at 8.8 months vs 16.5 months among those with epithelioid tumors.

This was reflected in the hazard ratios for overall survival vs nivo+ipi, at 0.46 and 0.86, respectively, the latter nonsignificantly different from combination immunotherapy.

For study discussant Dean A. Fennell, MD, PhD, professor and consultant in thoracic medical oncology, University of Leicester, United Kingdom, the epithet of a “new standard of care” for nivo+ipi should be reserved for nonepithelioid disease.

In this setting, he described the overall survival improvement as “transformative,” considering the “marked chemo resistance” of nonepithelioid tumors, which is “almost certainly” associated with epithelial-to-mesenchymal transition (EMT).

In the future, he suggested, combinations of chemotherapy and immunotherapy involving all histologies or selective targeting of nonepithelioid mesothelioma “could further extend the benefit for patients.”
 

Improving survival in mesothelioma

“We have been trying to improve the overall survival of patients with mesothelioma now for many decades,” Bass commented. Platinum-based chemotherapy plus pemetrexed is a standard of care, although the 5-year survival rate «is still below 10%,” he noted.

Randomized trials of single-agent immune checkpoint inhibitor therapy in the second-line treatment of patients with mesothelioma have not shown any significant benefits.

However, nivolumab and ipilimumab have a “complementary mechanism of action,” and two previous reports have indicated that together, they have clinical activity in the second-line setting.

The team conducted CheckMate 743 to determine the efficacy of the combination in the first-line setting.

The study involved 605 patients with pleural mesothelioma who had received no prior systemic therapy and had good performance status.

They were randomly assigned in a 1:1 ratio to receive nivo+ipi for up to 2 years or six cycles of pemetrexed plus cisplatin or carboplatin until disease progression or unacceptable toxicity occurred.

“Patients could have a subsequent therapy,” Bass noted; 44.0% of patients in the experimental arm received subsequent therapy, vs 44.1% of those in the chemotherapy arm.

Of the latter, 20% received an immune checkpoint inhibitor as subsequent therapy.

The minimum follow-up for overall survival was 22.1 months; the median follow-up was 29.7 months.

Nivo+ipi was associated with a significant improvement in overall survival vs standard-of-care chemotherapy, at a median overall survival of 18.1 months vs 14.1 months, with a hazard ratio of 0.74 (P = .0020).

The results indicated that overall survival was similar across key subgroups, which suggests that “no subgroup was harmed” by nivo+ipi, Bass said.
 

Stratification by PD-LI expression

Stratifying the patients by the absence or presence of programmed cell death–ligand-1 (PD-L1) expression, the team found that the performance of nivo+ipi was “the same” as that of chemotherapy, Bass said.

“But in cases where there is any expression of PD-L1, the experimental arm performs better,” at an overall survival 18.0 months vs 13.3 months for chemotherapy and a hazard ratio of 0.69, he said.

There was no difference between the two treatment arms in progression-free survival. Chemotherapy performed better in the first 6 months of treatment, after which the nivo+ipi arm had lower event rates.

Nivo+ipi was also associated with a greater duration of response, at a median of 11.0 months vs 6.7 months for standard-of-care chemotherapy.

Moreover, at 24 months, 32% of nivo+ipi patients were still experiencing a response, whereas 8% of those in the chemotherapy arm were.

Treatment-related adverse events rates were almost identical between the two treatment groups, although treatment with nivo+ipi was associated with more grade 3/4 serious treatment-related adverse events, at 15 vs six for chemotherapy.
 

Choosing immunotherapy vs. chemotherapy

In his discussion of the new study, Fennell compared the current results with those from two studies, INITIATE and MAPS2. “What’s very clear is the response rate is slightly higher,” as is the disease control rate, he said.

This, he explained, “is perhaps not surprising, given that these two previous trials were in the relapse setting.”

He pointed out, however, that the progression-free survival data from those previous trials were “not a million miles away” from results seen in CheckMate 743, “suggesting that this immunotherapy does have significant activity in the relapse setting.”

For Fennell, the “pivotal data” are in patients with nonepithelioid tumors, particularly inasmuch as chemotherapy performed “poorly” in this setting, whereas it performs “as expected” in epithelioid mesothelioma.

He believes that the driver for this is the poor prognosis associated with sarcomatoid biphasic disease, a subtype characterized by increased expression of vimentin and ZEB1, proteins both associated with EMT.

“What does this mean?” Fennell asked.

“If you have have enrichment of EMT, what you see is increased drug resistance, increased invasiveness, something we know well with sarcomatoid mesotheliomas in particular, and this drug-resistance phenotype may account for the drug resistance that we see in CheckMate 743 with chemotherapy.

“This does not appear, however, to impact in any way the efficacy of the immunotherapy,” he noted.

Fennell believes that, with regard to both efficacy and safety, the balance is “very much in favor” of nivo+ipi in epithelioid mesothelioma, although there is less to choose between immunotherapy and chemotherapy in the nonepithelioid setting.

Indeed, the choice is “possible tilting slightly towards chemotherapy” in patients with the nonepithelioid tumors, owing to the lower rates of grade 3/4 serious treatment-related adverse events in comparison with combination immunotherapy.

The study was supported by Bristol-Myers Squibb. Bass has served on the advisory boards of MSD, AstraZeneca, and Takeda. Fennell has received research support from AstraZeneca, Bristol-Myers Squibb, Clovis Oncology, Eli Lilly, MSD, and Roche; research funding from Astex Therapeutics, Bayer, and Boehringer Ingelheim; has served on the speaker bureau of AstraZeneca, Boehringer Ingelheim, and Roche; has acted as a consultant for Bayer and Lab 21; and has served on the advisory board of Atara Biotherapeutics, Boehringer Ingelheim, and Inventiva.

This article first appeared on Medscape.com.