Additive effect of RET polymorphisms in MEN2A-associated hyperparathyroidism

This study looks at people with a rare inherited condition called MEN2A. This condition can cause several health problems, including thyroid cancer, adrenal gland tumours, and overactive parathyroid glands (called hyperparathyroidism, or HPT). Not everyone with MEN2A develops HPT, and doctors want to understand why. 

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