in order to examine critically the closeness of association between epstein-barr virus ( ebv ) dna and nasopharyngeal carcinoma ( npc ) a correlated histopathological and nucleic acid hybridization study was performed on 51 undifferentiated npc , 4 npc with some signs of squamous differentiation , 7 nasophayngeal tumors of other histological types and 14 head and neck carcinomas located outside the nasopharynx .
C0279748
undifferentiated npc
C0027442
nasopharynx