...o Histologically confirmed, potentially resectable rectal adenocarcinoma staged as uT3/4 N0/1 by endosonography or cT3/4 by MRI of the pelvis with or without local lymph node metastases.o Wild-type KRAS.o ECOG-performance status 0 or 1.o Age ≥ 18 years.o Laboratory requirements:- Haematology: Leucocyte count > 3,000/mm³, neutrophil count ≥1.5x109/L, hemoglobin ≥ 8 g/dL, platelet count ≥100x109/L.- Hepatic Function: Total bilirubin ≤ 1.5 time the upper normal limit (UNL), ASAT ≤ 2.5xUNL in absence of liver metastases or ≤ 5xUNL in presence of liver metastases, ALAT ≤ 2.5xUNL in absence of liver metastases or ≤ 5xUNL in presence of liver metastases- Renal Function: Creatinine clearance ≥50 mL/min or serum creatinine ≤1.5xUNL- Metabolic Function: Magnesium ≥ lower limit of normal, Calcium ≥ lower limit of normal.o Negative ß-HCG-serum pregnancy test (females of child bearing potential).o Willing to use double-barrier contraception during study and for 6 months after the end of treatment. ...