Abstract: The present invention provides antibody polypeptides with binding specificity for human kallikrein-2 (hK2), wherein the antibody polypeptide comprises (a) a heavy chain variable region comprising the amino acid sequences of SEQ ID NO: 1 and SEQ ID NO: 2 and SEQ ID NO: 3 and/or (b) a light chain variable region comprising the amino acid sequences of SEQ ID NO: 4 and SEQ ID NO: 5 and SEQ ID NO: 6, and wherein the heavy chain variable region and light chain variable region comprise framework amino acid sequences from one or more human antibodies. The invention further provides use of said antibody polypeptides in the diagnosis and treatment of prostate cancer.

Abstract: Methods for diagnosing prostate cancer, and differentiate prostate cancer from other prostate complications, and use of said method, and diagnosing and monitoring lymph gland metastasis, post operative examinations, and examinations during or after radiation, cytostatic, and androgen treatments are disclosed. The methods comprise injecting tracer-labelled PSA or hK2 specific antibodies, visualising PSA or hK2 producing tissue with the aid of a visualization method, and diagnosing prostate cancer from the difference in visualization.