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Journal of Clinical Endocrinology & Metabolism, Vol 73, 931-935, Copyright © 1991 by Endocrine Society

ARTICLES

Reduction of testosterone synthesis after high dose interleukin-2 therapy of metastatic cancer

AW Meikle, JC Cardoso de Sousa, JH Ward, M Woodward and WE Samlowski
Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City 84132.

We have investigated the effect of high dose iv bolus interleukin-2 (IL- 2) therapy on sex hormone and adrenal steroid concentrations in six men treated for metastatic renal cell carcinoma or malignant melanoma. Blood concentrations of testosterone, 17 beta-estradiol, LH, FSH, cortisol, dehydroepiandrosterone (DHEA), and DHEA sulfate (DHEA-S) were measured before and after a 5-day course of IL-2 therapy. Cortisol levels rose and DHEA-S decreased insignificantly. DHEA declined, reaching a nadir (P less than 0.001) on day 6, and testosterone decreased significantly on day 2 and reached a nadir on day 6 (P less than 0.0001). Concentrations of both steroids then gradually rose. Estradiol rose on day 4 (P less than 0.001) and then declined. Neither LH nor FSH was affected significantly, although there was a rise in the mean level of LH after IL-2 therapy. Our results suggest that high dose IL-2 therapy in men affects both adrenal and testicular androgen production without inhibiting pituitary trophic hormone secretion. These effects of IL-2 on plasma sex steroids may be the result of cytokines stimulated by IL-2 therapy, rather than direct responses to IL-2.


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