The study will a be a biologically enriched, prospectively stratified phase II trial in RAS wild type metastatic colorectal cancer patients progressing after first-line treatment with oxaliplatin, fluoropyrimidines and an anti-EGFR monoclonal antibody. Eligible patients will be prospectively allocated to either of two groups according to VEGFR2 levels (ELISA-based technique, pg/ml) at study entry.~Others angiogenetic factors levels concentration before and during treatment. VEGF, PlGF, HGF, VEGFR1, IL8, IL1a, T-cad, VEGFR3, SAP, VDBP, neuropilin1, CRP, endoglin plasma concentrations will be evaluated before each cycle according to an ELISA-based technique All patients will undergo a blood test for retrieving circulating tumor DNA (Liquid Biopsy) at selected time-points before and during treatment for determining whether the status of selected tumor biomarkers evolve during tumor progression by comparing different ctDNA samples.~All patients will receive aflibercept in combination with FOLFIRI according to the Italian label.
The study will a be a biologically enriched, prospectively stratified phase II trial in RAS wild type metastatic colorectal cancer patients progressing after first-line treatment with oxaliplatin, fluoropyrimidines and an anti-EGFR monoclonal antibody.~All patients will receive aflibercept in combination with FOLFIRI according to the Italian label.