OBJECTIVES: I. Evaluate the safety of immunization with HLA class I-matched allogeneic human prostate carcinoma cells genetically engineered to secrete interleukin-2 and interferon gamma in patients with prostate carcinoma. II. Evaluate the antitumor effects of this treatment as assessed by post-therapy declines in PSA. III. Evaluate the induction of cellular and humoral immunity in vivo with this treatment.