Blood samples from patients with mCRC were obtained in the framework of the ongoing PANIRINOX phase II randomized clinical trial that compare the efficacy of FOLFIRINOX + panitumumab versus mFOLFOX6 + panitumumab in patients with mCRC selected on the basis of RAS and B-RAF status in circulating DNA (Protocol n. UC-0110/1608. EudraCT n. 2016-001490-33). All patients signed a written informed consent before inclusion. This trial involves 31 French hospitals/cancer centers and was approved by the Sud Méditerranée IV ethics committee. This cohort study was approved by Unicancer, the sponsor of the PANIRINOX study, and by the Agence Nationale de Sécurité du Médicament et des Produits de Santé and the Comités de Protection des Personnes, according to the French national regulatory requirements. Blood samples from HI were provided by the “Etablissement Français du Sang, the blood transfusion center of Montpellier, France (Agreement EFS-PM n. 21PLER2015-0013). All methods were carried out in accordance with relevant guidelines and regulations.
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