Organoselenium shows incredible promise in medicine, particularly cancer therapy. This book discusses organoselenium chemistry and biology in the context of its therapeutic potential, taking the reader through synthetic techniques, bioactivity and therapeutic applications. Divided into three sections, the first describes synthetic advances in bioactive selenium compounds; the second explains the biophysics and biochemistry of organoselenium compounds, as well as selenoproteins; the final section closes with several chapters devoted to therapeutic and medicinal applications of organoselenium compounds.