Table 1.

Histological and molecular heterogeneity in FA and follicular-patterned borderline lesions (H,K,N isoforms of RAS gene family).

	Mutations
	PAX8-PPARγ	EIF1AX	EZH1	GNAS	RAS	BRAF	RET/PTC
FA	5–20%	5–10%	3%	~80%	HRAS 8%, KRAS 10%, NRAS 6%	-	-
NIFTP	5%	-	-	-	H/N/KRAS (45%)	-	-
HTT	-	-	-	-	NRAS 0%	-	47%
FT/WDT-UMP	<5%	-	-	-	HRAS 3–12%, KRAS 6–9%, NRAS 16–35%	-	-