The invention provides antibodies which bind to the extracellular domain of the Tyrosine-protein kinase transmembrane receptor Matriptase. Nucleic acid molecules encoding the antibodies, expression vectors, host cells and methods for expressing the antibodies are also provided. The antibodies may be used for the treatment of cancer, including gastric cancer, colorectal cancer, prostate cancer, breast cancer, ovarian cancer lung cancer, preferably SCLC, esophageal cancer, head and neck cancer, pancreatic cancer, lymphoma preferably non-Hodgkin's lymphoma and skin cancer.