Efficacy, Safety and Exploratory Clinical Study of Bevacizumab Combined With Oxaliplatin and TAS-102 in First-line Treatment of Advanced Colorectal Cancer

"Bevacizumab (Anda, Qilu Pharmaceutical): 5 mg/kg, repeated every 2 weeks, administered by intravenous drip (ivgtt).~Oxaliplatin: 85 mg/m2, repeated every 2 weeks, by intravenous infusion (ivgtt). TAS-102: 35 mg/m2 (maximum single dose 80 mg), orally, twice a day, on days 1 to 5, repeated every 2 weeks.~Continuous administration until disease progression, death, toxicity intolerance, withdrawal of informed consent, or other reasons specified in the protocol; for patients who still benefit after comprehensive evaluation after initial disease progression, the investigator may decide whether to continue the treatment with the experimental drug ."