Journal Article
Research Support, Non-U.S. Gov't
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Genotypic analysis of Epstein-Barr virus isolates associated with nasopharyngeal carcinoma in Chinese immigrants to the United States.

EBV genotypes of first- and second-generation Chinese diagnosed with nasopharyngeal carcinoma in the United States were analyzed by PCR techniques. Previous studies showed a geographical distribution of genotypically distinct sub-types of EBV. Viruses detected at a higher frequency among Chinese NPC patients (Cf) were distinguished from those found in the majority of Caucasian NPC patients (DF) in the United States by polymorphisms in the BamHI F and I regions. Exploiting this distinction, we analyzed the biopsies of Chinese immigrants in the United States for their C/D and F/f genotypes to evaluate the importance of retention of the Cf virus among Chinese NPC patients in a geographical area where the DF virus prevails. This study shows that approximately 45.5 to 50% of first- and second-generation Chinese NPC patients in California harbor the Cf virus, which is present in only 8% of Caucasian NPC patients in California. It is interesting that, while only 48% of the viral isolates from immigrant Chinese to California harbor the "f" variant, 96% harbor the type-C viruses.

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