A method for determining whether a cancer patient is susceptible to treatment with a protein tyrosine kinase 2 (PTK2) inhibitor, comprising detecting the expression of the E-cadherin protein in a cancer sample of said cancer patient, wherein an E-cadherin protein immunoreactivity score (IRS) of 0-2 indicates that the cancer patient is susceptible to treatment with a PTK2 inhibitor. The invention further encompasses treatment of a patient with a protein tyrosine kinase 2 (PTK2) inhibitor if it has been so determined that said patient is susceptible to such treatment.
