Table 1. The numbers of mutations in the MMR genes reported by studies based on the Chinese population.

	MLH1	MSH2	MSH6	PMS2	Sample size
Ni [18]	52	22	NA	NA	153
Sheng et al. [20]	8	4	0	NA	21
Yan et al. [19]	NA	NA	4	NA	39
Sheng et al. [21]	NA	NA	NA	1	26
Weighted proportion	58%	25%	11%	6%