The aim of single arm phase II MEDITREME trial was to evaluate efficacy and safety of mFOLFOX6 (6 cycles) in combination with durvalumab (750mg/q2W) and tremelimumab (75mg/q4W) as induction therapy followed by maintenance therapy with durvalumab in patients with previously untreated RAS-mutated MCRC....High baseline levels of Th2 and PDL1+ MDSC were associated with poor PFS.