Table 5.

Prevalence of RAS variants among 50 644 thyroid FNA samples by Bethesda category

RAS gene	AUS/FLUS (III)	FN/SFN (IV)	SFM (V)	Malignant (VI)
HRAS variant	1156 (2.93%)	495 (5.22%)	12 (1.43%)	4 (0.47%)
KRAS variant	314 (0.80%)	129 (1.36%)	12 (1.43%)	6 (0.70%)
NRAS variant	1712 (4.34%)	681 (7.18%)	29 (3.46%)	7 (0.82%)
Any RAS variant	3179 (8.06%)	1304 (13.74%)	53 (6.33%)	17 (1.99%)

Some samples contained more than 1 RAS variant. Table 1 reports the total number of samples in each Bethesda category and the Bethesda category abbreviations.

Abbreviation: FNA, fine-needle aspiration.