A cell-based vaccine comprised of prostate cancer cells transduced with an adenoviral vector encoding human RTVP-1 (AdRTVP-1), with potential immunostimulating and antineoplastic activities. RTVP-1, also referred to as glioma pathogenesis-related protein 1 (GLIP1), is down-regulated in prostate tumors. Regulated by tumor suppressor p53, the expression of RTVP-1 functions as a tumor suppressor, and is abundant in normal human prostate epithelial cells as well as in differentiated macrophages. Administration of AdRTVP-1-transduced prostate cancer cell-based vaccine leads to an induction of apoptosis through the expression of RTVP-1, which may result in a reduction in prostate cancer cellular proliferation. In addition, this vaccine may induce a cytotoxic T lymphocyte (CTL) response against prostate specific tumor- associated antigens.