Further, because FVL mutation and prothrombin G20210A gene mutation are rarely found in Chinese healthy population or patients with venous thromboembolism, AT, PC, and PS deficiencies are more common than the Western populations [27–30]; we recommend that screening for inherited AT, PC, and PS deficiencies appears to be more necessary in these patients. The gene discussed is F2; the disease is ataxia telangiectasia.