Ectopic production of ADH is classically associated with which cancer?

Ectopic production of ADH is classically associated with which cancer?

• A. Basal cell carcinoma
• B. Oat-cell (small cell) carcinoma of the lung
• C. Colon adenocarcinoma
• D. Prostate cancer

Answer: (B)

Ectopic ADH production is a paraneoplastic phenomenon most often linked to neuroendocrine tumors, particularly small cell (oat cell) carcinoma of the lung. These tumors can secrete ADH independently of the pituitary, leading to the syndrome of inappropriate antidiuretic hormone secretion (SIADH) characterized by water retention, hyponatremia, low serum osmolality, and concentrated urine. The association with SIADH is classic for small cell lung cancer because of its neuroendocrine origin and ability to release peptide hormones. The other cancers listed are not typically associated with ectopic ADH production.

Ectopic ADH production is a paraneoplastic phenomenon most often linked to neuroendocrine tumors, particularly small cell (oat cell) carcinoma of the lung. These tumors can secrete ADH independently of the pituitary, leading to the syndrome of inappropriate antidiuretic hormone secretion (SIADH) characterized by water retention, hyponatremia, low serum osmolality, and concentrated urine. The association with SIADH is classic for small cell lung cancer because of its neuroendocrine origin and ability to release peptide hormones. The other cancers listed are not typically associated with ectopic ADH production.