We investigated the prevalence of the factor V (FV) Arg 506 Gin mutation in healthy subjects from three eastern Asian countries (Japan, n = 270; China, n = 113; and Korea, n = 93) and in 26 Japanese patients showing venous thromboembolic events. The patients were also examined for activated protein C (APC) resistance by using the Coatest® APC resistance kit. The FV mutation was investigated by polymerase chain reaction and restricted enzyme digestion with Mnl IRFLP assay of the FV gene. None of the patients showed APC resistance, while all subjects examined were homozygous for Arg at position 506 of the FV gene. Our results imply that FV mutation and APC resistance contribute little to venous thrombotic diseases in eastern Asia.

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