Pts >18 years with RAS mt mCRC, ECOG 0-1, acceptable organ function, measurable disease, and progression or ineligibility to oxaliplatin. Pts received binimetinib plus mFOLFIRI...Of the 25 pts, 24 were evaluable for response. Best response included 1 PR and 12 SD (all had received prior irinotecan and 10 had progressed on it). 4 pts remained on study for >6 months (7-15). The median PFS was 3.35 months (95% CI 2-8.61) and the median OS was 8.41 months (95% CI 4.7-12.8)....MEKi plus mFOLFIRI has acceptable toxicity and showed activity even in patients with prior progression on irinotecan.