A patient with hypogonadotropic hypogonadism owing to endogenous gonadotropin releasing hormone deficiency, who developed Hodgkin's disease is described. Chemotherapy administration caused prolonged and life-threatening myelosuppression; androgen substitution seemed to reverse bone marrow function and to maintain normal peripheral blood counts. Whether or not androgens are a necessary substitution in hypogonadal patients suffering from cancer and undergoing chemotherapy is discussed.