Low Serum Thymic Hormone Levels in Patients with Acquired Immunodeficiency Syndrome

Abstract
To the Editor: In a recent report by Hersh et al. (Jan. 6 issue),1 the serum levels of thymosin α1, a hormone isolated from the thymus,2 were evaluated by means of a specific radioimmunoassay3 in 10 homosexual men having the acquired immunodeficiency syndrome (AIDS), with severe opportunistic infections associated or not associated with Kaposi's sarcoma.4 All these patients, who were 25 to 36 years old, had lower helper: suppressor ratios and a markedly higher (threefold) level of thymosin α1 than healthy controls. This finding suggested to the authors the existence of a feedback control of this hormone . . .