This book covers clinically used anticancer agents that are either natural products or are clearly derived from natural product leads. The second edition includes drugs that are currently in development. In addition, the text emphasizes the applications of synthetic and medicinal chemistry to the preparation of analogs with enhanced activities. Contributors also address the potential of novel drug discovery through the use of genome mining as well as the status of advanced development candidates. For each class of compounds, the text provides information on the history, structure, mechanism of action, development, synthesis, medicinal chemistry, and clinical applications.