Moreover, even in the absence of a family history of PC or PAs, >30% of patients with PCs have a CDC73 germline mutation, thereby indicating they had an unrecognized HPT‐JT syndrome or FIHP (Shattuck et al., 2003b; Cetani et al., 2004; Gill, 2014). The gene discussed is CDC73; the disease is familial isolated hyperparathyroidism.