Genetic study of thrombophilia.- The prevalence of the heterozygote Factor V Leiden mutation was 7 of 271 (2.6%), the heterozygote G20210A prothrombin mutation was 13 (4.8%), and the homozygote C677T MTHFR mutation was 39 (14.9%). Here, F2 is linked to Rare hereditary thrombophilia.