Upfront Modified Fluorouracil, Leucovorin, Oxaliplatin, and Irinotecan Plus Panitumumab Versus Fluorouracil, Leucovorin, and Oxaliplatin Plus Panitumumab for Patients With <i>RAS/BRAF</i> Wild-Type Metastatic Colorectal Cancer: The Phase III TRIPLETE Study by GONO