What genetic variations affect my Warfarin dosing level? Genetic variations in CYP2C9, VKORC1, GGCX and CYP4F2 all affect the warfarin dose required to achieve a stable INR. DNA In the News2016-12-20T19:06:31+00:00 Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail