Composition including rilpivirine and method for treating tumors or cancer

The present invention provides a composition and method for preventing the growth of and/or treating cancerous tumors and/or delaying onset of cancer from tumor-initiating cells. The composition includes an effective amount of a compound of Formula (I) or Formula (II): or any pharmaceutically acceptable salt thereof. The composition is administered alone or in combination with one or more chemotherapeutic agents, biological agents and/or anticancer agents. The method may include administering the composition of the present invention with or without the chemotherapeutic, biological, or other cancer treatment agent to a subject in need thereof intravenously, parenterally, nasally, topically or locally, orally, or by liposome, implant or via vessel-targeted nanosuspension delivery.