One patient (MEN1 c.526G > T) associated PHEO and familial hypocalciuric hypercalcemia, and 2 other had PHEO and idiopathic hypercalcemia (RB2 c.644C > T), respectively, primary hyperparathyroidism (ATM c.5639C > T). Here, RBL2 is linked to primary hyperparathyroidism.