The present invention relates to the discovery, identification and characterization of a novel tumor suppressor gene designated PARIS-1. The invention includes nucleotide sequences of the PARIS-1 gene and amino acid sequences of its encoded protein product(s), as well as fragments, derivatives and analogs thereof. The invention also includes the production of PARIS-1 proteins, fragments and derivatives and of antibodies specific for PARIS-1 gene products. The invention further comprises agents and compositions which can modulate the expression of PARIS-1 or PARIS-1 expression products to effect the proliferation of cells which express PARIS-1. One particular embodiment comprises agents and compounds which can slow or ablate the proliferation of prostate tumor cells.