Genetic and Clinical Features of Multiple Endocrine Neoplasia Types 1 and 2

Table 5

Classification of RET mutations according to ATA risk level.

ATA risk level	RET codons
A (low)	768, 790, 791, 804, 649, 891
B (medium)	609, 611, 618, 620, 630, 631
C (high)	634
D (highest)	918, 883