sera collected from patients with nasopharyngeal carcinoma ( npc , 321 cases ) , cancer of the other sites ( 297 cases ) , diseases of the ear , nose and throat ( 64 cases ) and neighborhood controls matched for age and sex ( 817 cases ) were titrated for antibodies to epstein-barr virus ( ebv ) by the indirect immunofluorescence antibody technique .
C2931822
nasopharyngeal carcinoma
C0031354
throat