Findings from a phase I/II study indicate a higher response rate among patients with BRAF-mutant metastatic colorectal cancer treated with an EGFR inhibitor alongside dual, as opposed to single-level, MAPK blockade. Panitumumab combined with trametinib and dabrafenib only modestly increased median progression-free survival, however; a short-lived decrease in responders' BRAF V600E mutant allele fraction and the emergence of RAS mutations may have been contributing factors.
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