This is a randomized trial comparing induction treatment with FOLFOX with or without aflibercept in a high risk population selected by MRI, prior to receiving standard chemoradiation (capecitabine combined with 50.4 Gy in 28 days) and surgery. Once it is confirmed that the subjects fulfill the eligibility criteria (MRI-defined high risk RC), and have signed the informed consent, a central review will be requested to confirm clinical stage, and then they will be randomized to receive mFOLFOX6 + Aflibercept or mFOLFOX6 (without Aflibercept).