Abstract: The present invention includes a composition comprising an effective amount of an avermectin compound, and an effective amount of an imidazole antifungal compound, and/or an effective amount of non-steroidal anti-inflammatory drug (NSAID) or suitable pharmaceutically acceptable salts thereof, for use in the inhibition of tumor growth and treating urothelial, colorectal, prostate and/or breast cancers. Furthermore, the invention includes a method of inhibiting tumor growth and treating said cancers comprising administering to a subject in need thereof an effective amount of said composition.