[Two Cases of Recurrent Colon Cancer with BRAF Mutation]

We report 2 cases of recurrent colon cancer with BRAF mutation. Case 1, a 75-year-old man, had rapid progress of multiple liver metastasis 5 months after curative resection, and died on 37 days after recurrence without induction of systemic therapy. Case 2, a 67-year-old man with diagnosis of peritoneal dissemination at 8 months after curative resection, received encorafenb and cetuximab (doublet-therapy) with certain effect, nevertheless advanced triplet-therapy with binimetinib was forced to pause due to severe skin disorders and he died on 123 days after recurrence. We considered that closed follow- up should be required after curatively resected colorectal cancers with BRAF mutation for early detection of recurrence, and prompt induction and evaluation of systemic treatment also should be required after unresectable recurrence including careful management with the attention to the features of doublet and triplet-therapy.