title: Serum immunoglobulin A (IgA) levels in carcinoma of the head and neck.
mesh_terms: D006258:Head and Neck Neoplasms / Q000209:etiology / Q000276:immunology*; D006801:Humans; D005779:Immunodiffusion; D007070:Immunoglobulin A / Q000032:analysis*
chemical_list: D007070:Immunoglobulin A