The present invention relates to biomarkers of use in
cancer therapy, wherein the therapy comprises treatment with anti-Trop-2, anti-CEACAM5 or anti-HLA-DR ADCs (
antibody-
drug conjugates), alone or in combination with and one or more anti-
cancer agents, such as a DDR inhibitor, an ABCG2 inhibitor, a
microtubule inhibitor, a checkpoint inhibitor, a PI3K inhibitor, an
AKT inhibitor, a CDK 4 inhibitor, a CDK 5 inhibior, a
tyrosine kinase inhibitor or a
platinum-based chemotherapeutic agent. Preferably, the
combination therapy has a synergistic effect on inhibiting
tumor growth. The biomarkers are of use to predict
efficacy and / or
toxicity of ADC therapy, determine
tumor response to treatment, identify minimal residual
disease or relapse, determine prognosis, stratify patients for initial therapy or to optimize treatment for the patient, based on the specific biomarkers detected.