Table 4. Subgroup comparison of RAS mutation frequency between Western and Asian countries.

Genetic alterations	No. with mutation/total no. [%]		P value
	Western countries	Asian countries
NRAS	31/136 [23]	76/328 [23]	0.93
HRAS	4/115 [3]	11/283 [4]	0.84
KRAS	2/108 [2]	10/293 [3]	0.41
Any RAS	52/206 [25]	92/328 [28]	0.47

Western countries include Europe and North American countries.