Central Hypothyroidism Associated with Retinoid X Receptor–Selective Ligands

Abstract
The occurrence of symptomatic central hypothyroidism (characterized by low serum thyrotropin and thyroxine concentrations) in a patient with cutaneous T-cell lymphoma during therapy with the retinoid X receptor–selective ligand bexarotene led us to hypothesize that such ligands could reversibly suppress thyrotropin production by a thyroid hormone–independent mechanism and thus cause central hypothyroidism.