In Vivo: Oral administration of GW3965 or RGX-104 hydrochloride to animals bearing palpable tumors significantly suppresses the growth of multiple cancer types. Strong tumor growth suppression is also observed in animals bearing large tumors. In some instances, the treatment causes partial or complete tumor regression. Responses are seen across a wide spectrum of malignancies, including lung cancer, melanoma, glioblastoma, and ovarian, renal cell, triple-negative breast, and colon cancer.