ocr: Increased Risk of Head and Trait Neck Cancer* Carcinogen metabolizing enzyme dehciencies Phase I enzymes Yes Phase II enzymes Yes Acetylation enzymes Yes Heritable characteristics associated NE with race Heritable characteristics associated NE with gender HLA phenotype Yes Cancer family syndrome Lynch syndrome types I and II No Li-Fraumeni syndrome No Epithelial ditterentiation disorders Dyskeratosis congenita Yes Iron metabolism disorders Yes DNA repair deficiency syndromes Bloom's syndrome Yes Fanconi's anemia Yes Ataxin-telangtectasia Yes Xeroderma pigmentosum Yes Mutagen sensitivity
