The present invention relates to prostate cancer markers, compositions comprising such markers, immunoglobulins specific for such markers, and methods of using such markers and/or immunoglobulins to assess an immune response against prostate cancer. An immune response against the markers correlates with an immune response, in particular a humoral immune response, against prostate cancer cells which immune response is preferably associated with prophylaxis of prostate cancer, treatment of prostate cancer, and/or amelioration of at least one symptom associated with prostate cancer.