Question

small cell (oat cell) undifferentiated carcinoma of the lung is most likely to be directly associated with the production and secretion of which one of the following hormone - like substances?
parathyroid hormone
somatotropic hormone
adrenocorticotropic hormone
prolactin

Explanation:

Small cell (oat cell) lung cancer is known to be associated with paraneoplastic syndromes, often producing hormone - like substances. Adrenocorticotropic hormone (ACTH) is commonly produced by small cell lung cancer, leading to ectopic Cushing's syndrome. Parathyroid hormone is associated with hypercalcemia in some malignancies but not typically small cell lung cancer. Somatotropic hormone (growth hormone) and prolactin are not typically associated with small cell lung cancer's hormone - like secretion.

Answer:

C. Adrenocorticotropic hormone