Platinum coordination compounds are among the most utilized anticancer agents, even though platinum has not been determined to be an essential trace element in any living organism. The success of platinum-based drugs has catalyzed research on other metal-containing agents that can be used to achieve therapeutic goals that cannot be achieved with organic compounds. The antitumor activities of recently reported platinum(ii) complexes indicate that further modification of platinum coordination compounds will lead to the development of anticancer agents with higher efficacies against chemotherapy-insensitive tumors.