De-escalation Chemotherapies Versus Escalation in Non Pre-treated Unresectable Patients With Metastatic Colorectal Cancer

Thus, the objective of this work is to combine continuous blocking of angiogenesis by bevacizumab given on the first 3 metastatic lines in a randomised phase II trial evaluating a "descending" strategy of immediate optimisation by 4 cycles of FOLFOXIRI-bevacizumab and 4 cycles of FOLFIRI-bevacizumab, followed by maintenance treatment with 5FU-bevacizumab until progression (re-introduction of induction in case of progression) and evaluate an "ascending" strategy with 5FU-bevacizumab immediately followed, at progression, by the introduction of irinotecan, then oxaliplatin, with maintenance of blocking of angiogenesis by bevacizumab.