Schema of the exploratory analyses (RAS wild-type population) Schema of the exploratory analyses (RAS wild-type population). EGFRi, epidermal growth factor receptor inhibitor; FOLFIRI, folinic acid, 5-fluorouracil and irinotecan; FOLFOX, 5-fluorouracil, leucovorin and oxaliplatin; OS, overall survival; PEAK, Panitumumab Efficacy in combination with mFOLFOX6 Against bevacizumab plus mFOLFOX6 in mCRC subjects with KRAS WT tumours; PRIME, Panitumumab Randomized trial In combination with chemotherapy for Metastatic colorectal cancer to determine Efficacy; R, randomisation; VEGFi, vascular endothelial growth factor inhibitor. Schema of the exploratory analyses (RAS wild-type population). EGFRi, epidermal growth factor receptor inhibitor; FOLFIRI, folinic acid, 5-fluorouracil and irinotecan; FOLFOX, 5-fluorouracil, leucovorin and oxaliplatin; OS, overall survival; PEAK, Panitumumab Efficacy in combination with mFOLFOX6 Against bevacizumab plus mFOLFOX6 in mCRC subjects with KRAS WT tumours; PRIME, Panitumumab Randomized trial In combination with chemotherapy for Metastatic colorectal cancer to determine Efficacy; R, randomisation; VEGFi, vascular endothelial growth factor inhibitor. Marc Peeters et al. ESMO Open 2018;3:e000297 Copyright © European Society for Medical Oncology. All rights reserved.