Ergosterol is a sterol component of cell membranes in yeast and fungi. Ergosterol is a target for many antifungal compounds. Ergosterol exhibits anti-angiogenic, anticancer chemotherapeutic, and chemopreventive activities. In animal models of bladder cancer, ergosterol inhibits tumor promotion. Ergosterol also inhibits neovascularization and decreases tumor growth in animal models of sarcoma.