MEN1 and parathyroid gland adenoma: Conversely, a single parathyroid adenoma, whose excision resulted in the cure of PHPT, was found in 9/14 (64%) and 9/15 (60%) MEN1 mutation-negative probands and patients of the whole cohort submitted to PTx, respectively [mean follow-up 7yr (SD 4)] (P<0.0001 in both groups) (Table 3).