Investigation of adrenocortical function in patients with progressive bronchogenic carcinoma without Cushing's syndrome has been extended with special reference to (1) disease progression (patient's survival time); (2) cell type of carcinoma; (3) brain metastases; and (4) extra-adrenal cortisol metabolism. The concentrations of 17-hydroxycorticosteroids (17-OHCS) in plasma were usually normal in the patients who survived the longest, greater than thirty weeks; were increased abnormally in patients who survived five to thirty weeks; and were further increased, often markedly, in patients within five weeks of death. The mean urinary excretion of 17-OHCS per gram creatinine was significantly higher than in the control group at all survival periods and increased further as death approached. Within five weeks of death, despite a considerable scatter of values, 42 per cent of the patients showed increased urinary excretion of 17-OHCS per gram creatinine, whereas in patients who survived for more than thirty weeks the incidence was 20 per cent. The abnormally high steroid excretion in the group five weeks before death was found predominantly in patients with oat cell and undifferentiated cell carcinoma; the mean urinary levels of both 17-OHCS and 17-ketosteroids (17-KS) were significantly higher in these patients than in patients with squamous cell and adenocarcinoma. The mean response of 17-OHCS in plasma to ACTH stimulation was essentially normal and did not change as the interval to death shortened, but the response of 17-OHCS in urine diminished, suggesting a decline in adrenocortical reserve. Nine of forty-two patients demonstrated hyperresponsiveness to ACTH administration, as reflected in 17-OHCS in plasma and/or urine. An increased incidence of elevated steroid levels was found in patients believed to have brain metastases but, in general, it was probably related to the advanced stage of the disease rather than to specific brain involvement. In selective cases, however, brain metastases may have influenced adrenocortical hyperfunction. Although the increased urinary excretion of 17-OHCS suggests augmented adrenal cortisol secretion, there was in addition considerable evidence for altered extra-adrenal cortisol metabolism in patients as the carcinoma progressed, as follows: High levels of 17-OHCS in plasma were found often in conjunction with normal urinary excretion of 17-OHCS. Urinary output of unconjugated 17-OHCS increased proportionately more than total 17-OHCS in patients with the most advanced disease resulting in a higher ratio of unconjugated to total 17-OHCS. There was a proportionately slightly higher increase in urinary steroid levels of 17-KS and 17-ketogenic versus 17-OHCS following ACTH administration. It is concluded that a spectrum of adrenocortical hyperfunction and altered cortisol metabolism exists in patients with progressively invasive bronchogenic carcinoma as an integral part of the disease. The adrenocortical hyperfunction is most pronounced in patients with advanced oat cell and undifferentiated carcinoma, indicating a connection between the high incidence of Cushing's syndrome reported in these types of patients.
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