Human Nasopharyngeal Carcinomas Positive for Epstein-Barr Virus DNA in North America2

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Abstract
Nasopharyngeal carcinomas (NPC) from 2 black patients and 1 Caucasian patient were positive for Epstein-Barr virus (EBV) DNA. Of the tumors, 2 were lymphoepitheliomas (undifferentiated NPC) and 1 was a moderately differentiated NPC. All 3 patients had high IgG titers against EBV early antigen and high IgG and IgA titers against virus capsid antigen (VCA). In one patient, the levels of anti-VCA IgA were different than those of anti-VCA IgG over the course of the diseases. Our data support the association of EBV and NPC in North America.

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