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in updated results of a trial.
This was based on data collected over a median follow-up of 54 months. Previously reported data from this phase III study, known as monarchE, showed the same outcomes but over a 2-year treatment period, the researchers said.
Risk of cancer recurrence may be as much as 30% at 5 years in these high-risk patients, who will likely need more intense treatment, wrote Priya Rastogi, MD, of the University of Pittsburgh Medical Center, and colleagues.
In the new study published in the Journal of Clinical Oncology (2023 Jan 9. doi: 10.1200/JCO.23.019), the researchers reported 5-year efficacy results from an interim analysis of overall survival in the monarchE trial.
The intent-to-treat population included 2808 individuals randomized to abemaciclib plus ET and 2814 to ET alone; the median age was 51 years, and approximately 70% of the participants were White.
The addition of abemaciclib significantly reduced the risk of IDFS and DRFS over a median follow-up period of 54 months with hazard ratios of 0.680 and 0.675, respectively. Adjuvant abemaciclib also significantly improved DRFS over ET alone (HR 0.675).
The findings were limited by the lack of statistical significance for overall survival with abemaciclib. However, the increased benefits for IDFS and DRFS with abemaciclib plus ET vs. ET alone were consistent across all subgroups, and the benefit of abemaciclib was consistent regardless of the number of nodes involved, the researchers wrote.
“Prior reports from this trial with shorter follow-up demonstrated benefit of abemaciclib. However, with longer follow-up of a median 54 months, we see that the benefit of the drug is not only sustained (32% reduction in the risk of a disease event), but that there is further separation of the curves with an absolute difference in IDFS and DRFS rates of 7.6% and 6.7, comparing the ET alone vs. ET plus abemaciclib arms,” study coauthor Matthew P. Goetz, MD, said in an interview.
Although statistical significance was not reached for overall survival, fewer deaths occurred in the abemaciclib-plus-ET group compared with the ET-only group, said Dr. Goetz, of the Mayo Clinic, Rochester, Minnesota. However, patients with the worst prognosis (Ki-67–high subgroup) tended to have higher overall survival.
A total of 208 deaths occurred in the combination group vs. 234 in the ET-only group, and no new safety signals were observed. The occurrence of serious adverse events of any cause was similar in the abemaciclib group and the ET-only group (6.5% vs. 7.3%).
“These data are a pleasant surprise, as there were concerns that the benefit of the drug seen with shorter follow-up would wane over time,” Dr. Goetz said. “However, the opposite has occurred; with increasing length of follow-up, the curves continue to separate.”
Based on the new results, “we have high confidence that for patients with ER+/HER2- breast cancer at high risk of recurrence, the addition of 2 years of adjuvant abemaciclib to ET results in clinically significant improvements in IDFS,” he said.
Looking ahead, “we need additional follow-up to determine whether the benefit we now see in terms of IDFS will eventually translate into improvements in overall survival,” Dr. Goetz said. “We need to identify biomarkers that can identify patients at risk for early recurrence despite administration of adjuvant abemaciclib and further, biomarkers that will allow us to select patients that can be safely treated with ET alone.”
Findings Confirm Value of Combined Treatment
“It was reassuring to see the continued benefit at 5 years with adjuvant abemaciclib in combination with endocrine therapy compared to endocrine therapy alone in this high-risk HR+, HER2– EBC [early breast cancer] population,” Manali Ajay Bhave, MD, a medical oncologist at Emory University, Atlanta, said in an interview.
“While the interim overall survival analysis was not significant, further follow-up is necessary to truly discern a survival benefit particularly in this patient population where a survival advantage may not be seen for several years,” she added.
The current study supports the continued use of adjuvant abemaciclib in high-risk HR+, HER2– EBC patients, Dr. Bhave said. “Investigation of novel endocrine agents in the adjuvant setting for patients with high risk, HR+ HER2– EBC is needed to further improve outcomes.”
Urgent Need to Improve Adjuvant Therapy
“The monarchE study is a timely study aimed at improving adjuvant treatments in ER+ breast cancer to reduce risk of late recurrences,” Malinda T. West, MD, of the University of Wisconsin, said in an interview. “Late recurrences occurring decades later is a risk associated with ER+ breast cancer, and the risk of breast cancer recurrence is highest in those with larger tumors and nodal involvement.
“Abemaciclib is one of the three FDA-approved cyclin-dependent kinase 4/6 inhibitors in metastatic ER+ breast cancer based on demonstrated efficacy and safety in the metastatic setting compared to endocrine therapy alone, which was the rationale for expanded use of abemaciclib into the adjuvant setting for those at high risk for recurrence and basis of the monarchE trial,” said Dr. West.
An important criterion for inclusion was the randomization to abemaciclib required within 16 months of definitive breast cancer surgery, which reflected a window of time in which to start adjuvant abemaciclib, Dr. West said. “Exclusion criteria were those with a history of thromboembolic events, as abemaciclib carries a warning for venous thromboembolism,” she added.
In the monarchE follow-up, Dr. West said she was encouraged by the persistent and widening benefit with 2 years of added abemaciclib to endocrine therapy in reducing IDFS and DRFS compared to endocrine therapy alone.
Dr. West advised clinicians to consider initiating the therapy for up to 16 months after definitive breast surgery, because doing so may allow for recovery from surgery, chemotherapy, and radiation.
The findings tell physicians to “use caution with adding abemaciclib in those with a history of thromboembolic events or VTE risk factors as abemaciclib has a known VTE warning and this population was excluded in the monarchE trial,” she noted.
“Continued long-term follow up of those in this study will be important to determine survival benefits and how the predictive biomarker Ki-67 may impact survival outcomes,” she said.
The study was supported by Eli Lilly. Lead author Dr. Rastogi disclosed travel, accommodations, and expenses from Genentech/Roche, Lilly, and AstraZeneca. Several coauthors disclosed stock or ownership interests and/or other relationships with Lilly and other pharmaceutical companies. Dr. Goetz receives research funding from the National Institutes of Health. Dr. Bhave and Dr. West had no financial conflicts to disclose.
in updated results of a trial.
This was based on data collected over a median follow-up of 54 months. Previously reported data from this phase III study, known as monarchE, showed the same outcomes but over a 2-year treatment period, the researchers said.
Risk of cancer recurrence may be as much as 30% at 5 years in these high-risk patients, who will likely need more intense treatment, wrote Priya Rastogi, MD, of the University of Pittsburgh Medical Center, and colleagues.
In the new study published in the Journal of Clinical Oncology (2023 Jan 9. doi: 10.1200/JCO.23.019), the researchers reported 5-year efficacy results from an interim analysis of overall survival in the monarchE trial.
The intent-to-treat population included 2808 individuals randomized to abemaciclib plus ET and 2814 to ET alone; the median age was 51 years, and approximately 70% of the participants were White.
The addition of abemaciclib significantly reduced the risk of IDFS and DRFS over a median follow-up period of 54 months with hazard ratios of 0.680 and 0.675, respectively. Adjuvant abemaciclib also significantly improved DRFS over ET alone (HR 0.675).
The findings were limited by the lack of statistical significance for overall survival with abemaciclib. However, the increased benefits for IDFS and DRFS with abemaciclib plus ET vs. ET alone were consistent across all subgroups, and the benefit of abemaciclib was consistent regardless of the number of nodes involved, the researchers wrote.
“Prior reports from this trial with shorter follow-up demonstrated benefit of abemaciclib. However, with longer follow-up of a median 54 months, we see that the benefit of the drug is not only sustained (32% reduction in the risk of a disease event), but that there is further separation of the curves with an absolute difference in IDFS and DRFS rates of 7.6% and 6.7, comparing the ET alone vs. ET plus abemaciclib arms,” study coauthor Matthew P. Goetz, MD, said in an interview.
Although statistical significance was not reached for overall survival, fewer deaths occurred in the abemaciclib-plus-ET group compared with the ET-only group, said Dr. Goetz, of the Mayo Clinic, Rochester, Minnesota. However, patients with the worst prognosis (Ki-67–high subgroup) tended to have higher overall survival.
A total of 208 deaths occurred in the combination group vs. 234 in the ET-only group, and no new safety signals were observed. The occurrence of serious adverse events of any cause was similar in the abemaciclib group and the ET-only group (6.5% vs. 7.3%).
“These data are a pleasant surprise, as there were concerns that the benefit of the drug seen with shorter follow-up would wane over time,” Dr. Goetz said. “However, the opposite has occurred; with increasing length of follow-up, the curves continue to separate.”
Based on the new results, “we have high confidence that for patients with ER+/HER2- breast cancer at high risk of recurrence, the addition of 2 years of adjuvant abemaciclib to ET results in clinically significant improvements in IDFS,” he said.
Looking ahead, “we need additional follow-up to determine whether the benefit we now see in terms of IDFS will eventually translate into improvements in overall survival,” Dr. Goetz said. “We need to identify biomarkers that can identify patients at risk for early recurrence despite administration of adjuvant abemaciclib and further, biomarkers that will allow us to select patients that can be safely treated with ET alone.”
Findings Confirm Value of Combined Treatment
“It was reassuring to see the continued benefit at 5 years with adjuvant abemaciclib in combination with endocrine therapy compared to endocrine therapy alone in this high-risk HR+, HER2– EBC [early breast cancer] population,” Manali Ajay Bhave, MD, a medical oncologist at Emory University, Atlanta, said in an interview.
“While the interim overall survival analysis was not significant, further follow-up is necessary to truly discern a survival benefit particularly in this patient population where a survival advantage may not be seen for several years,” she added.
The current study supports the continued use of adjuvant abemaciclib in high-risk HR+, HER2– EBC patients, Dr. Bhave said. “Investigation of novel endocrine agents in the adjuvant setting for patients with high risk, HR+ HER2– EBC is needed to further improve outcomes.”
Urgent Need to Improve Adjuvant Therapy
“The monarchE study is a timely study aimed at improving adjuvant treatments in ER+ breast cancer to reduce risk of late recurrences,” Malinda T. West, MD, of the University of Wisconsin, said in an interview. “Late recurrences occurring decades later is a risk associated with ER+ breast cancer, and the risk of breast cancer recurrence is highest in those with larger tumors and nodal involvement.
“Abemaciclib is one of the three FDA-approved cyclin-dependent kinase 4/6 inhibitors in metastatic ER+ breast cancer based on demonstrated efficacy and safety in the metastatic setting compared to endocrine therapy alone, which was the rationale for expanded use of abemaciclib into the adjuvant setting for those at high risk for recurrence and basis of the monarchE trial,” said Dr. West.
An important criterion for inclusion was the randomization to abemaciclib required within 16 months of definitive breast cancer surgery, which reflected a window of time in which to start adjuvant abemaciclib, Dr. West said. “Exclusion criteria were those with a history of thromboembolic events, as abemaciclib carries a warning for venous thromboembolism,” she added.
In the monarchE follow-up, Dr. West said she was encouraged by the persistent and widening benefit with 2 years of added abemaciclib to endocrine therapy in reducing IDFS and DRFS compared to endocrine therapy alone.
Dr. West advised clinicians to consider initiating the therapy for up to 16 months after definitive breast surgery, because doing so may allow for recovery from surgery, chemotherapy, and radiation.
The findings tell physicians to “use caution with adding abemaciclib in those with a history of thromboembolic events or VTE risk factors as abemaciclib has a known VTE warning and this population was excluded in the monarchE trial,” she noted.
“Continued long-term follow up of those in this study will be important to determine survival benefits and how the predictive biomarker Ki-67 may impact survival outcomes,” she said.
The study was supported by Eli Lilly. Lead author Dr. Rastogi disclosed travel, accommodations, and expenses from Genentech/Roche, Lilly, and AstraZeneca. Several coauthors disclosed stock or ownership interests and/or other relationships with Lilly and other pharmaceutical companies. Dr. Goetz receives research funding from the National Institutes of Health. Dr. Bhave and Dr. West had no financial conflicts to disclose.
in updated results of a trial.
This was based on data collected over a median follow-up of 54 months. Previously reported data from this phase III study, known as monarchE, showed the same outcomes but over a 2-year treatment period, the researchers said.
Risk of cancer recurrence may be as much as 30% at 5 years in these high-risk patients, who will likely need more intense treatment, wrote Priya Rastogi, MD, of the University of Pittsburgh Medical Center, and colleagues.
In the new study published in the Journal of Clinical Oncology (2023 Jan 9. doi: 10.1200/JCO.23.019), the researchers reported 5-year efficacy results from an interim analysis of overall survival in the monarchE trial.
The intent-to-treat population included 2808 individuals randomized to abemaciclib plus ET and 2814 to ET alone; the median age was 51 years, and approximately 70% of the participants were White.
The addition of abemaciclib significantly reduced the risk of IDFS and DRFS over a median follow-up period of 54 months with hazard ratios of 0.680 and 0.675, respectively. Adjuvant abemaciclib also significantly improved DRFS over ET alone (HR 0.675).
The findings were limited by the lack of statistical significance for overall survival with abemaciclib. However, the increased benefits for IDFS and DRFS with abemaciclib plus ET vs. ET alone were consistent across all subgroups, and the benefit of abemaciclib was consistent regardless of the number of nodes involved, the researchers wrote.
“Prior reports from this trial with shorter follow-up demonstrated benefit of abemaciclib. However, with longer follow-up of a median 54 months, we see that the benefit of the drug is not only sustained (32% reduction in the risk of a disease event), but that there is further separation of the curves with an absolute difference in IDFS and DRFS rates of 7.6% and 6.7, comparing the ET alone vs. ET plus abemaciclib arms,” study coauthor Matthew P. Goetz, MD, said in an interview.
Although statistical significance was not reached for overall survival, fewer deaths occurred in the abemaciclib-plus-ET group compared with the ET-only group, said Dr. Goetz, of the Mayo Clinic, Rochester, Minnesota. However, patients with the worst prognosis (Ki-67–high subgroup) tended to have higher overall survival.
A total of 208 deaths occurred in the combination group vs. 234 in the ET-only group, and no new safety signals were observed. The occurrence of serious adverse events of any cause was similar in the abemaciclib group and the ET-only group (6.5% vs. 7.3%).
“These data are a pleasant surprise, as there were concerns that the benefit of the drug seen with shorter follow-up would wane over time,” Dr. Goetz said. “However, the opposite has occurred; with increasing length of follow-up, the curves continue to separate.”
Based on the new results, “we have high confidence that for patients with ER+/HER2- breast cancer at high risk of recurrence, the addition of 2 years of adjuvant abemaciclib to ET results in clinically significant improvements in IDFS,” he said.
Looking ahead, “we need additional follow-up to determine whether the benefit we now see in terms of IDFS will eventually translate into improvements in overall survival,” Dr. Goetz said. “We need to identify biomarkers that can identify patients at risk for early recurrence despite administration of adjuvant abemaciclib and further, biomarkers that will allow us to select patients that can be safely treated with ET alone.”
Findings Confirm Value of Combined Treatment
“It was reassuring to see the continued benefit at 5 years with adjuvant abemaciclib in combination with endocrine therapy compared to endocrine therapy alone in this high-risk HR+, HER2– EBC [early breast cancer] population,” Manali Ajay Bhave, MD, a medical oncologist at Emory University, Atlanta, said in an interview.
“While the interim overall survival analysis was not significant, further follow-up is necessary to truly discern a survival benefit particularly in this patient population where a survival advantage may not be seen for several years,” she added.
The current study supports the continued use of adjuvant abemaciclib in high-risk HR+, HER2– EBC patients, Dr. Bhave said. “Investigation of novel endocrine agents in the adjuvant setting for patients with high risk, HR+ HER2– EBC is needed to further improve outcomes.”
Urgent Need to Improve Adjuvant Therapy
“The monarchE study is a timely study aimed at improving adjuvant treatments in ER+ breast cancer to reduce risk of late recurrences,” Malinda T. West, MD, of the University of Wisconsin, said in an interview. “Late recurrences occurring decades later is a risk associated with ER+ breast cancer, and the risk of breast cancer recurrence is highest in those with larger tumors and nodal involvement.
“Abemaciclib is one of the three FDA-approved cyclin-dependent kinase 4/6 inhibitors in metastatic ER+ breast cancer based on demonstrated efficacy and safety in the metastatic setting compared to endocrine therapy alone, which was the rationale for expanded use of abemaciclib into the adjuvant setting for those at high risk for recurrence and basis of the monarchE trial,” said Dr. West.
An important criterion for inclusion was the randomization to abemaciclib required within 16 months of definitive breast cancer surgery, which reflected a window of time in which to start adjuvant abemaciclib, Dr. West said. “Exclusion criteria were those with a history of thromboembolic events, as abemaciclib carries a warning for venous thromboembolism,” she added.
In the monarchE follow-up, Dr. West said she was encouraged by the persistent and widening benefit with 2 years of added abemaciclib to endocrine therapy in reducing IDFS and DRFS compared to endocrine therapy alone.
Dr. West advised clinicians to consider initiating the therapy for up to 16 months after definitive breast surgery, because doing so may allow for recovery from surgery, chemotherapy, and radiation.
The findings tell physicians to “use caution with adding abemaciclib in those with a history of thromboembolic events or VTE risk factors as abemaciclib has a known VTE warning and this population was excluded in the monarchE trial,” she noted.
“Continued long-term follow up of those in this study will be important to determine survival benefits and how the predictive biomarker Ki-67 may impact survival outcomes,” she said.
The study was supported by Eli Lilly. Lead author Dr. Rastogi disclosed travel, accommodations, and expenses from Genentech/Roche, Lilly, and AstraZeneca. Several coauthors disclosed stock or ownership interests and/or other relationships with Lilly and other pharmaceutical companies. Dr. Goetz receives research funding from the National Institutes of Health. Dr. Bhave and Dr. West had no financial conflicts to disclose.
FROM THE JOURNAL OF CLINICAL ONCOLOGY