The present invention relates to the anti-cancer activity of IL-19 polypeptide molecules. IL-19 is a cytokine involved in inflammatory processes and human disease. The present invention includes Use of IL-19 for decreasing proliferation of cervical cancer cells, treating cervical cancer, amongst other uses disclosed. IL-19 polypeptides can be administered alone, or can be fused to cytotoxic moieties, and can be administered in conjunction with radiation or chemotherapeutic agents.