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Clinical Data Presented On Binimetinib And Encorafenib In Melanoma
Array will hold a conference call to discuss these results and preliminary results from a colorectal cancer trial on
BRAF-mutant Melanoma Preliminary Results
LOGIC2 is an ongoing 140-patient, two-part study designed to explore the safety and activity of novel triplet combinations in BRAF-mutant melanoma. In part 1, patients are treated with the combination of binimetinib and encorafenib until disease progression. Based on the results of molecular profiling at that time, each patient is assigned to one of four arms containing a triplet combination of binimetinib, encorafenib and a third targeted therapy. Results from part 1 of the study are reported separately for patients who have previously received a BRAF and/or MEK inhibitor versus those who were initially naive to BRAF and MEK inhibitor treatment.
In part 1, patients are treated with binimetinib 45 mg twice daily (BID) and encorafenib 450 mg once daily (QD), the same doses evaluated in the ongoing Phase 3 COLUMBUS trial. In the BRAF/MEK-naive group (n=40), the interim overall response rate (confirmed and unconfirmed complete response or partial response) was 68%, with a 6-month progression-free survival estimate of 79%. Of note, 96% of patients in this group continued to receive study treatment as of the data cutoff. Preliminary data from all patients in the study (n=89) also indicate that the combination of binimetinib and encorafenib showed good tolerability with a 12% incidence of pyrexia and little to no rash or photosensitivity. These results indicate that the combination of binimetinib and encorafenib show encouraging clinical activity and an emerging differentiated tolerability profile relative to other MEK/BRAF inhibitor combinations.
"MEK and BRAF combination therapy is now established as the optimal molecularly targeted approach for BRAF mutant melanoma patients," said
NRAS-mutant Melanoma Interim Results
A Phase 1b/2 study of binimetinib in combination with ribociclib showed promising preliminary antitumor activity in NRAS-mutant melanoma patients. Results were shared from 45 patients enrolled in the dose escalation portion of the study, which included two dosing schedules (28-day or 21-day cycles). For the 28-day dosing schedule, patients received continuous twice daily dosing of binimetinib while receiving ribociclib for 21 days per 28 day cycle. For the 21-day schedule, both agents were delivered for 14 days of a 21 day cycle.
For patients receiving the combination on a 28-day cycle (n=22), the Objective Response Rate (ORR, confirmed and unconfirmed complete or partial responses) was 41%, the Disease Control Rate (DCR, confirmed and unconfirmed complete or partial responses and stable disease) was 82% with a median Progression Free Survival (mPFS) of 6.7 months. Furthermore, the ORR was 56% (n=9) for patients receiving dose level 1 of the 28-day schedule consisting of binimetinib 45 mg BID and the lowest dose of ribociclib (200 mg QD), indicating that robust activity can be achieved with this dose and schedule. Common treatment-related adverse events included elevated creatine phosphokinase (CPK), skin and gastrointestinal events. Investigation of an alternative 21-day schedule is ongoing.
"Among metastatic melanoma patients, the presence of an NRAS-mutation is a predictor of poor prognosis, and for this subgroup of patients, there are currently no approved targeted therapies," said
Melanoma is the fifth most common cancer among men and the seventh most common cancer among women in
About BRAF, MEK, Binimetinib and Encorafenib
Raf and MEK are key protein kinases in the RAS/RAF/MEK/ERK pathway, which regulates several key cellular activities including proliferation, differentiation, migration, survival and angiogenesis. Inappropriate activation of this pathway has been shown to occur in many cancers, such as non-small cell lung cancer, melanoma, colorectal and thyroid cancers. Binimetinib is a small molecule MEK inhibitor and encorafenib is a small molecule BRAF inhibitor, both of which target key enzymes in this pathway. Three Phase 3 trials in advanced cancer patients continue to advance: NRAS-mutant melanoma (NEMO, with binimetinib), low-grade serous ovarian cancer (MILO, with binimetinib) and BRAF-mutant melanoma (COLUMBUS, with binimetinib and encorafenib). The NEMO and COLUMBUS Part 1 studies completed enrollment in
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