<qa>  What was the overall survival rate of colorectal cancer?A multicenter Open-label, single-arm feasibility study is conducted on patients with histological stage IV colorectal cancer given oxaliplatin, leucovorin plus fluorouracil. The usefulness of this regimens as therapy for colorectal cancer was evaluated by the disease-free survival rate DFR, overall survival rate OS, incidence and severity of adverse event. 