RET and medullary thyroid gland carcinoma: Additional mutations of unknown significance involving tumors other than MTC included RET R114H (n = 6), M1109I/T (n = 2), RET R525Q (n = 2), RET R600Q (n = 2), RET V706M (n = 2), RET A756V (n = 1), RET M255I (n = 1), RET R163Q (n = 1), and RET T636M (n = 1).