There were no previous reports of RFC1−43 T > C, FPGS 1994 G > A, GGH−401 C > T, and ABCC2 IVS23 + 56 T > C in a healthy Japanese population except for HapMap-JPT and RFC1−43 T > C, FPGS 1994 G > A, and ABCC2 IVS23 + 56 T > C in Japanese patients with RA for the evaluation of allelic frequency. Here, FPGS is linked to rheumatoid arthritis.