The present invention provides a method of predicting response of a cancer patient to a therapy. The method comprises the step of determining a presence or absence of at least one mutation of ITCH (SEQ ID NO: 1) in a first sample isolated from a cancer patient, wherein the presence of a mutation is predictive of response of the cancer patient to a therapy selected from the group consisting of: Wnt pathway-, EGFR-, Her2-, hormonal- and WBP2-based therapy.