Plasma steroid dynamics in Cushing's syndrome.

The dynamics of five plasma steroids were studied by CPB and RIA in twenty patients with Cushing's syndrome of differing etiologies: pituitary induced adrenal hyperplasia (10), recurrence after adrenal surgery or pituitary irradiation (4), adrenal carcinoma (4) and adrenal adenoma (2). Basal mean values of plasma steroids, showed increase of cortisol in hyperplasia and cancer groups, increase of 17-hydroxyprogesterone (17-OH-P) in recurrence and cancer groups and decrease of testosterone in male patients. In hyperplasia, the changes in 11-desoxycortisol and 17-OH-P (respectively by CPB assay and RIA after LH-20-Sephadex separation) were the reverse of those for cortisol 2 h and 24 h after metyrapone administration. Adrenalectomy determined in all but one patients, significant decrease of cortisol and in male patients, parallel gradual increase of testosterone.