“…First line chemotherapy for metastatic CRC includes the combinations of fluorouracil, leucovorin, and irinotecan (FOLFIRI), fluorouracil, leucovorin, and oxaliplatin (FOLFOX), capecitabine and oxaliplatin (XELOX), and the combination of fluorouracil, leucovorin, oxaliplatin, and irinotecan (FOLFOXIRI) [2]. The use of these combination therapies for metastatic CRC have led to response rates of >50% and median survival of up to 2 years [3,4]. However, practically all metastatic CRC become resistant to chemotherapy [5].…”