Primary hyperparathyroidism, Familial hyperparathyroidism

Familial hyperparathyroidism (HRPT) is characterized by parathyroid adenoma and hyperplasia with hypersecretion of parathyroid hormone and hypercalcaemia. It is caused by mutation in the HRPT2 (CDC73 or Parafibromin) gene that also causes the hyperparathyroidism-jaw tumor syndrome. Sporadic cases are also known to occur with somatic mutations within the MEN1 gene.