Biological Activities of Steroids in Relation to Cancer covers the proceedings of the conference sponsored by the Cancer Chemotherapy National Service Center, National Cancer Institute, National Institutes of Health, and the U. S. Department of Health, Education and Welfare. The text focuses on the influence of steroids on medical approaches to the cure of cancer, including steroid chemistry, estrogen metabolism, and mammary cancer. The selection first offers information on steroids growth and cancer, advances in steroid chemistry, and the physiology and pharmacology of steroids affecting tumor growth. Discussions focus on rapid development of mammary cancer, pituitary functions, androgens, estrogens, and progestins. The book also ponders on the binding of steroid hormones by plasma proteins; the effects of steroids on the levels of the plasma 17-hydroxycorticosteroids and the serum protein-bound iodine; and the metabolism of dehydroisoandrosterone. The text evaluates studies on estrogen metabolism, biochemical parameters of estrogen action, and enzymatic transport of hydrogen by estrogenic hormones. The manuscript also elaborates on the fate of steroid estrogens in target tissues, effect of steroids on calcium dynamics, and steroids and experimental mammary cancer. The selection is a valuable source of information for readers interested in the use of steroids in treating cancer.