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Study Overview
Objective. To evaluate whether the combination of encorafenib plus cetuximab with or without the MEK inhibitor binimetin
Design. Global, multicenter, randomized, open-label, phase 3 trial.
Intervention. Patients were randomized in a 1:1:1 fashion to 1 of 3 groups: triplet-therapy group (encorafenib 300 mg daily, binimetinib 45 mg twice daily, and cetuximab 400 mg/m2 of body surface area initially, then 250 mg/m2 weekly), doublet-therapy group (encorafenib and cetuximab in same doses and schedule as the triplet-therapy group), and control group (investigators choice of cetuximab and irinotecan or cetuximab and FOLFIRI). The randomization was stratified by performance status and prior irinotecan use. Treatment was given until progression or unacceptable toxicities on a 28-day cycle. No crossover was permitted.
Setting and participants. 665 patients underwent randomization: 224 patients to triplet-therapy, 220 to doublet-therapy, and 221 to the control group. Eligible patients had histologically confirmed metastatic colorectal cancer with a BRAF V600E mutation. Patients all had disease progression after 1 or 2 previous lines of therapy.
Main outcome measures. The primary end point of the study was OS and objective response rate (ORR) in the triplet-therapy group compared with the control group. Secondary endpoints included OS in the doublet-therapy group compared with the control group, as well as progression-free survival (PFS), duration of response (DOR), and safety. Assessments were performed every 6 weeks for the first 24 weeks and then every 12 weeks thereafter.
Results. The baseline characteristics were well balanced between the treatment arms. At the time of data cutoff, the median duration of follow-up was 7.8 months for each group. The median OS was 9 months in the triplet-therapy group and 5.4 months in the control group (hazard ratio [HR] for death, 0.52; 95% confidence interval [CI], 0.39-0.70; P < 0.001). The median OS was 8.4 months for the doublet-therapy group, resulting in a significant reduction in the risk of death compared with the control group (HR, 0.6; 95% CI, 0.45-0.79; P < 0.001). The estimated 6-month survival was 71% for the triplet-therapy group, 65% for the doublet-therapy group, and 47% for the control group. The triplet-therapy group had a higher ORR compared with the control group (26% versus 2%, P < 0.001). The ORR in the doublet-therapy group was also significantly higher than that in the control group (20% versus 2%, P < 0.001). Complete responses were seen in 4% of patients in the triplet-therapy group, 5% of the doublet-therapy group, and no patients in the control group. PFS was significantly longer in both the triplet-therapy and doublet-therapy groups compared with the control group (median PFS: 4.3 months, 4.2 months, 1.5 months, respectively). This translated into a 62% and 60% reduction in the risk for disease progression or death in the triplet-therapy and doublet-therapy groups, respectively, compared to the control group.
The most common adverse event reported in the triplet-therapy group was gastrointestinal (GI) related (diarrhea, nausea, and vomiting), with grade 3 or higher GI toxicity seen in 10% of patients. Skin toxicity in the form of acneiform dermatitis was seen in almost 50% of those in the triplet-therapy arm; however, grade 3 or higher skin toxicity was uncommon (2%). Overall, adverse events grade 3 or higher were observed in 58% of those in the triplet-therapy group, 50% in the doublet-therapy group, and 61% in the control group. Adverse events leading to drug discontinuation occurred in 7% in the triplet-therapy group, 8% in the doublet-therapy group, and 11% in the control group. Three deaths were considered treatment related: 1 in the triplet-therapy group (bowel perforation) and 2 in the control group (anaphylaxis and respiratory failure).
Conclusion. The triplet-combination of encorafenib, binimetinib, and cetuximab as well as the doublet-regimen of encorafenib and cetuximab improved both PFS and OS in patients with metastatic, BRAF V600E–mutated colorectal cancer that has progressed after 1 or 2 lines of therapy.
Commentary
The current interim analysis of the BEACON CRC trial demonstrates improved response rates, PFS, and, importantly, OS with the triplet regimen of encorafenib, binimetinib, and cetuximab in patients with metastatic BRAF V600E–mutated colorectal cancer compared to standard irinotecan-based therapy. Similarly, a doublet-regimen of encorafenib and cetuximab also improved outcomes compared with irinotecan-based chemotherapy, resulting in significantly higher response rates, PFS, and OS.
BRAF mutations are seen in approximately 5% to 15% of colorectal cancers and are more commonly seen in right-sided disease. BRAF-mutated colorectal cancer has a poor prognosis, and the presence of a BRAF mutation is an independent prognostic factor for decreased survival.1 Previous work to improve outcomes in this subset of patients has been largely disappointing. For example, Kopetz and colleagues have previously shown that single-agent BRAF inhibition with vemurafenib in metastatic BRAF-mutated colorectal cancer did not show meaningful clinical activity.2 Preclinical studies have suggested that single-agent BRAF or MEK inhibition alone do not lead to sustained MAPK pathway inhibition. Mechanistically, inhibition of BRAF has been shown to lead to feedback activation of EGFR; thus, inhibition of BRAF alone does not lead to cessation of proliferation.3 In light of this, the combination of EGFR and BRAF inhibition has been an attractive therapeutic strategy. Yaeger and colleagues enrolled 15 patients in a pilot study looking at the efficacy and safety of the BRAF inhibitor vemurafenib and the EGFR antibody panitumumab in patients with BRAF-mutated metastatic colorectal cancer. In this cohort, combined BRAF and EGFR inhibition showed tumor regression in 10 of 12 patients.4 This finding was validated in other subsequent studies.5
The current study is the first phase 3 trial to validate the efficacy of BRAF, MEK, and EGFR inhibition in patients with BRAF-mutant metastatic colorectal cancer. The results of this study represent a very important step forward in treating this patient cohort that has historically had very poor clinical outcomes. The combination of encorafenib, binimetinib, and cetuximab improved OS by 48% compared with standard irinotecan-based chemotherapy. In light of this, we now have a chemotherapy-free targeted combination that improves survival and likely represents the new standard of care in patients with BRAF-mutated colorectal cancer after progression on 1 or 2 prior lines of therapy. Ongoing trials are being pursued to investigate the efficacy of these combinations in the upfront setting, and the results of these trials are eagerly awaited.
Applications for Clinical Practice
The combination of encorafenib, binimetinib, and cetuximab improved OS in patients with BRAF-mutated metastatic colorectal cancer after progression on 1 or 2 prior lines of therapy. This combination represents a potential new standard of care in this patient population.
–Daniel Isaac, DO, MS
1. Souglakos J, Philips J, Wang, R, et al. Prognostic and predictive value of common mutations for treatment response and survival in patients with metastatic colorectal cancer. Br J Cancer. 2009;101:465-472.
2. Kopetz S, Desai J, Chan E, et al. Phase II pilot study of vemurafenib in patients with metastatic BRAF-mutated colorectal cancer. J Clin Oncol. 2015;33:4032-4038.
3. Prahallad A, Sun C, Huang S, et al. Unresponsiveness of colon cancer to BRAF (V600e) inhibition through feedback activation of EGFR. Nature. 2012;483:100-103.
4. Yaeger R, Cercek A, O’Reilly EM, et al. Pilot trial of combined BRAF and EGFR inhibition in BRAF-mutant metastatic colorectal cancer patients. Clin Cancer Res. 2015;21:1313-1320.
5. Van Geel EMJM, Tabernero J, Elez E, et al. A phase Ib dose-escalation study of encorafenib and cetuximab with or without alpelisib in metastatic BRAF-mutant colorectal cancer. Cancer Discov. 2017;7:610-619.
Study Overview
Objective. To evaluate whether the combination of encorafenib plus cetuximab with or without the MEK inhibitor binimetin
Design. Global, multicenter, randomized, open-label, phase 3 trial.
Intervention. Patients were randomized in a 1:1:1 fashion to 1 of 3 groups: triplet-therapy group (encorafenib 300 mg daily, binimetinib 45 mg twice daily, and cetuximab 400 mg/m2 of body surface area initially, then 250 mg/m2 weekly), doublet-therapy group (encorafenib and cetuximab in same doses and schedule as the triplet-therapy group), and control group (investigators choice of cetuximab and irinotecan or cetuximab and FOLFIRI). The randomization was stratified by performance status and prior irinotecan use. Treatment was given until progression or unacceptable toxicities on a 28-day cycle. No crossover was permitted.
Setting and participants. 665 patients underwent randomization: 224 patients to triplet-therapy, 220 to doublet-therapy, and 221 to the control group. Eligible patients had histologically confirmed metastatic colorectal cancer with a BRAF V600E mutation. Patients all had disease progression after 1 or 2 previous lines of therapy.
Main outcome measures. The primary end point of the study was OS and objective response rate (ORR) in the triplet-therapy group compared with the control group. Secondary endpoints included OS in the doublet-therapy group compared with the control group, as well as progression-free survival (PFS), duration of response (DOR), and safety. Assessments were performed every 6 weeks for the first 24 weeks and then every 12 weeks thereafter.
Results. The baseline characteristics were well balanced between the treatment arms. At the time of data cutoff, the median duration of follow-up was 7.8 months for each group. The median OS was 9 months in the triplet-therapy group and 5.4 months in the control group (hazard ratio [HR] for death, 0.52; 95% confidence interval [CI], 0.39-0.70; P < 0.001). The median OS was 8.4 months for the doublet-therapy group, resulting in a significant reduction in the risk of death compared with the control group (HR, 0.6; 95% CI, 0.45-0.79; P < 0.001). The estimated 6-month survival was 71% for the triplet-therapy group, 65% for the doublet-therapy group, and 47% for the control group. The triplet-therapy group had a higher ORR compared with the control group (26% versus 2%, P < 0.001). The ORR in the doublet-therapy group was also significantly higher than that in the control group (20% versus 2%, P < 0.001). Complete responses were seen in 4% of patients in the triplet-therapy group, 5% of the doublet-therapy group, and no patients in the control group. PFS was significantly longer in both the triplet-therapy and doublet-therapy groups compared with the control group (median PFS: 4.3 months, 4.2 months, 1.5 months, respectively). This translated into a 62% and 60% reduction in the risk for disease progression or death in the triplet-therapy and doublet-therapy groups, respectively, compared to the control group.
The most common adverse event reported in the triplet-therapy group was gastrointestinal (GI) related (diarrhea, nausea, and vomiting), with grade 3 or higher GI toxicity seen in 10% of patients. Skin toxicity in the form of acneiform dermatitis was seen in almost 50% of those in the triplet-therapy arm; however, grade 3 or higher skin toxicity was uncommon (2%). Overall, adverse events grade 3 or higher were observed in 58% of those in the triplet-therapy group, 50% in the doublet-therapy group, and 61% in the control group. Adverse events leading to drug discontinuation occurred in 7% in the triplet-therapy group, 8% in the doublet-therapy group, and 11% in the control group. Three deaths were considered treatment related: 1 in the triplet-therapy group (bowel perforation) and 2 in the control group (anaphylaxis and respiratory failure).
Conclusion. The triplet-combination of encorafenib, binimetinib, and cetuximab as well as the doublet-regimen of encorafenib and cetuximab improved both PFS and OS in patients with metastatic, BRAF V600E–mutated colorectal cancer that has progressed after 1 or 2 lines of therapy.
Commentary
The current interim analysis of the BEACON CRC trial demonstrates improved response rates, PFS, and, importantly, OS with the triplet regimen of encorafenib, binimetinib, and cetuximab in patients with metastatic BRAF V600E–mutated colorectal cancer compared to standard irinotecan-based therapy. Similarly, a doublet-regimen of encorafenib and cetuximab also improved outcomes compared with irinotecan-based chemotherapy, resulting in significantly higher response rates, PFS, and OS.
BRAF mutations are seen in approximately 5% to 15% of colorectal cancers and are more commonly seen in right-sided disease. BRAF-mutated colorectal cancer has a poor prognosis, and the presence of a BRAF mutation is an independent prognostic factor for decreased survival.1 Previous work to improve outcomes in this subset of patients has been largely disappointing. For example, Kopetz and colleagues have previously shown that single-agent BRAF inhibition with vemurafenib in metastatic BRAF-mutated colorectal cancer did not show meaningful clinical activity.2 Preclinical studies have suggested that single-agent BRAF or MEK inhibition alone do not lead to sustained MAPK pathway inhibition. Mechanistically, inhibition of BRAF has been shown to lead to feedback activation of EGFR; thus, inhibition of BRAF alone does not lead to cessation of proliferation.3 In light of this, the combination of EGFR and BRAF inhibition has been an attractive therapeutic strategy. Yaeger and colleagues enrolled 15 patients in a pilot study looking at the efficacy and safety of the BRAF inhibitor vemurafenib and the EGFR antibody panitumumab in patients with BRAF-mutated metastatic colorectal cancer. In this cohort, combined BRAF and EGFR inhibition showed tumor regression in 10 of 12 patients.4 This finding was validated in other subsequent studies.5
The current study is the first phase 3 trial to validate the efficacy of BRAF, MEK, and EGFR inhibition in patients with BRAF-mutant metastatic colorectal cancer. The results of this study represent a very important step forward in treating this patient cohort that has historically had very poor clinical outcomes. The combination of encorafenib, binimetinib, and cetuximab improved OS by 48% compared with standard irinotecan-based chemotherapy. In light of this, we now have a chemotherapy-free targeted combination that improves survival and likely represents the new standard of care in patients with BRAF-mutated colorectal cancer after progression on 1 or 2 prior lines of therapy. Ongoing trials are being pursued to investigate the efficacy of these combinations in the upfront setting, and the results of these trials are eagerly awaited.
Applications for Clinical Practice
The combination of encorafenib, binimetinib, and cetuximab improved OS in patients with BRAF-mutated metastatic colorectal cancer after progression on 1 or 2 prior lines of therapy. This combination represents a potential new standard of care in this patient population.
–Daniel Isaac, DO, MS
Study Overview
Objective. To evaluate whether the combination of encorafenib plus cetuximab with or without the MEK inhibitor binimetin
Design. Global, multicenter, randomized, open-label, phase 3 trial.
Intervention. Patients were randomized in a 1:1:1 fashion to 1 of 3 groups: triplet-therapy group (encorafenib 300 mg daily, binimetinib 45 mg twice daily, and cetuximab 400 mg/m2 of body surface area initially, then 250 mg/m2 weekly), doublet-therapy group (encorafenib and cetuximab in same doses and schedule as the triplet-therapy group), and control group (investigators choice of cetuximab and irinotecan or cetuximab and FOLFIRI). The randomization was stratified by performance status and prior irinotecan use. Treatment was given until progression or unacceptable toxicities on a 28-day cycle. No crossover was permitted.
Setting and participants. 665 patients underwent randomization: 224 patients to triplet-therapy, 220 to doublet-therapy, and 221 to the control group. Eligible patients had histologically confirmed metastatic colorectal cancer with a BRAF V600E mutation. Patients all had disease progression after 1 or 2 previous lines of therapy.
Main outcome measures. The primary end point of the study was OS and objective response rate (ORR) in the triplet-therapy group compared with the control group. Secondary endpoints included OS in the doublet-therapy group compared with the control group, as well as progression-free survival (PFS), duration of response (DOR), and safety. Assessments were performed every 6 weeks for the first 24 weeks and then every 12 weeks thereafter.
Results. The baseline characteristics were well balanced between the treatment arms. At the time of data cutoff, the median duration of follow-up was 7.8 months for each group. The median OS was 9 months in the triplet-therapy group and 5.4 months in the control group (hazard ratio [HR] for death, 0.52; 95% confidence interval [CI], 0.39-0.70; P < 0.001). The median OS was 8.4 months for the doublet-therapy group, resulting in a significant reduction in the risk of death compared with the control group (HR, 0.6; 95% CI, 0.45-0.79; P < 0.001). The estimated 6-month survival was 71% for the triplet-therapy group, 65% for the doublet-therapy group, and 47% for the control group. The triplet-therapy group had a higher ORR compared with the control group (26% versus 2%, P < 0.001). The ORR in the doublet-therapy group was also significantly higher than that in the control group (20% versus 2%, P < 0.001). Complete responses were seen in 4% of patients in the triplet-therapy group, 5% of the doublet-therapy group, and no patients in the control group. PFS was significantly longer in both the triplet-therapy and doublet-therapy groups compared with the control group (median PFS: 4.3 months, 4.2 months, 1.5 months, respectively). This translated into a 62% and 60% reduction in the risk for disease progression or death in the triplet-therapy and doublet-therapy groups, respectively, compared to the control group.
The most common adverse event reported in the triplet-therapy group was gastrointestinal (GI) related (diarrhea, nausea, and vomiting), with grade 3 or higher GI toxicity seen in 10% of patients. Skin toxicity in the form of acneiform dermatitis was seen in almost 50% of those in the triplet-therapy arm; however, grade 3 or higher skin toxicity was uncommon (2%). Overall, adverse events grade 3 or higher were observed in 58% of those in the triplet-therapy group, 50% in the doublet-therapy group, and 61% in the control group. Adverse events leading to drug discontinuation occurred in 7% in the triplet-therapy group, 8% in the doublet-therapy group, and 11% in the control group. Three deaths were considered treatment related: 1 in the triplet-therapy group (bowel perforation) and 2 in the control group (anaphylaxis and respiratory failure).
Conclusion. The triplet-combination of encorafenib, binimetinib, and cetuximab as well as the doublet-regimen of encorafenib and cetuximab improved both PFS and OS in patients with metastatic, BRAF V600E–mutated colorectal cancer that has progressed after 1 or 2 lines of therapy.
Commentary
The current interim analysis of the BEACON CRC trial demonstrates improved response rates, PFS, and, importantly, OS with the triplet regimen of encorafenib, binimetinib, and cetuximab in patients with metastatic BRAF V600E–mutated colorectal cancer compared to standard irinotecan-based therapy. Similarly, a doublet-regimen of encorafenib and cetuximab also improved outcomes compared with irinotecan-based chemotherapy, resulting in significantly higher response rates, PFS, and OS.
BRAF mutations are seen in approximately 5% to 15% of colorectal cancers and are more commonly seen in right-sided disease. BRAF-mutated colorectal cancer has a poor prognosis, and the presence of a BRAF mutation is an independent prognostic factor for decreased survival.1 Previous work to improve outcomes in this subset of patients has been largely disappointing. For example, Kopetz and colleagues have previously shown that single-agent BRAF inhibition with vemurafenib in metastatic BRAF-mutated colorectal cancer did not show meaningful clinical activity.2 Preclinical studies have suggested that single-agent BRAF or MEK inhibition alone do not lead to sustained MAPK pathway inhibition. Mechanistically, inhibition of BRAF has been shown to lead to feedback activation of EGFR; thus, inhibition of BRAF alone does not lead to cessation of proliferation.3 In light of this, the combination of EGFR and BRAF inhibition has been an attractive therapeutic strategy. Yaeger and colleagues enrolled 15 patients in a pilot study looking at the efficacy and safety of the BRAF inhibitor vemurafenib and the EGFR antibody panitumumab in patients with BRAF-mutated metastatic colorectal cancer. In this cohort, combined BRAF and EGFR inhibition showed tumor regression in 10 of 12 patients.4 This finding was validated in other subsequent studies.5
The current study is the first phase 3 trial to validate the efficacy of BRAF, MEK, and EGFR inhibition in patients with BRAF-mutant metastatic colorectal cancer. The results of this study represent a very important step forward in treating this patient cohort that has historically had very poor clinical outcomes. The combination of encorafenib, binimetinib, and cetuximab improved OS by 48% compared with standard irinotecan-based chemotherapy. In light of this, we now have a chemotherapy-free targeted combination that improves survival and likely represents the new standard of care in patients with BRAF-mutated colorectal cancer after progression on 1 or 2 prior lines of therapy. Ongoing trials are being pursued to investigate the efficacy of these combinations in the upfront setting, and the results of these trials are eagerly awaited.
Applications for Clinical Practice
The combination of encorafenib, binimetinib, and cetuximab improved OS in patients with BRAF-mutated metastatic colorectal cancer after progression on 1 or 2 prior lines of therapy. This combination represents a potential new standard of care in this patient population.
–Daniel Isaac, DO, MS
1. Souglakos J, Philips J, Wang, R, et al. Prognostic and predictive value of common mutations for treatment response and survival in patients with metastatic colorectal cancer. Br J Cancer. 2009;101:465-472.
2. Kopetz S, Desai J, Chan E, et al. Phase II pilot study of vemurafenib in patients with metastatic BRAF-mutated colorectal cancer. J Clin Oncol. 2015;33:4032-4038.
3. Prahallad A, Sun C, Huang S, et al. Unresponsiveness of colon cancer to BRAF (V600e) inhibition through feedback activation of EGFR. Nature. 2012;483:100-103.
4. Yaeger R, Cercek A, O’Reilly EM, et al. Pilot trial of combined BRAF and EGFR inhibition in BRAF-mutant metastatic colorectal cancer patients. Clin Cancer Res. 2015;21:1313-1320.
5. Van Geel EMJM, Tabernero J, Elez E, et al. A phase Ib dose-escalation study of encorafenib and cetuximab with or without alpelisib in metastatic BRAF-mutant colorectal cancer. Cancer Discov. 2017;7:610-619.
1. Souglakos J, Philips J, Wang, R, et al. Prognostic and predictive value of common mutations for treatment response and survival in patients with metastatic colorectal cancer. Br J Cancer. 2009;101:465-472.
2. Kopetz S, Desai J, Chan E, et al. Phase II pilot study of vemurafenib in patients with metastatic BRAF-mutated colorectal cancer. J Clin Oncol. 2015;33:4032-4038.
3. Prahallad A, Sun C, Huang S, et al. Unresponsiveness of colon cancer to BRAF (V600e) inhibition through feedback activation of EGFR. Nature. 2012;483:100-103.
4. Yaeger R, Cercek A, O’Reilly EM, et al. Pilot trial of combined BRAF and EGFR inhibition in BRAF-mutant metastatic colorectal cancer patients. Clin Cancer Res. 2015;21:1313-1320.
5. Van Geel EMJM, Tabernero J, Elez E, et al. A phase Ib dose-escalation study of encorafenib and cetuximab with or without alpelisib in metastatic BRAF-mutant colorectal cancer. Cancer Discov. 2017;7:610-619.