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In order to investigate the relation of weight loss and intravenous hyperalimentation therapy to low T3 syndrome, serum T3, T4. rT3 and TBG were determined by radioimmunoassay in 105 cancer patients. The cancer patients were classified into 3 groups, Group I, II and III depending on the grade of weight loss, ranging up to a 5% change in weight loss from a healthy condition, from 5 to 9%, and more than 10%, respectively. Cancer patients under age 59 showed no significant difference in serum T3, T4, rT3 and TBG among these 3 groups. However serum T3 and T3/T4 in cancer patients at age 60 and over were significantly reduced in group III, compared to groups I and II. Serum rT3 values were significantly elevated in group III of elderly cancer patients. The incidence of low T3 syndrome in group III of elderly cancer patients was also significantly higher than in groups I and II. In three out of 5 cancer patients with low T3 syndrome, serum T3 values increased after the intravenous hyperalimentation therapy, whereas no significant change in serum T3 values was observed in two patients who died within one day after the final examination. It is concluded that weight loss produced different effects on peripheral conversion of T4 to T3 between cancer patients under age 59 and over age 60 and glucose plays an important role in the pathogenesis of low T3 syndrome except cases with very poor prognosis.

Low T3 syndrome in cancer patients in relation to weight loss, intravenous hyperalimentation therapy and age.