AMH and medullary thyroid gland carcinoma: In contrast, a comorbid diagnosis of pheochromocytoma was more common (63%, n = 12) among familial patients with AMH than among patients with sporadic disease (9%, n = 4) (P < .05), as was a comorbid diagnosis of MTC (32%, n = 6 vs 6%, n = 3, respectively; P < .05) (Table 5).