Determination of nonendemic nasopharyngeal carcinoma by in situ hybridization for Epstein-Barr virus EBER1 RNA: sensitivity and specificity in cervical node metastases.
After time-consuming and costly investigations, patients with neck metastases from an occult primary often receive unnecessarily large radiation volumes to treat a possible origin in the nasopharynx. In this study a colorimetric antisense Epstein-Barr early ribonucleoprotein 1 (EBER1) oligonucleotide probe specific for Epstein-Barr virus RNA was hybridized in situ to metastatic tissue obtained fro