Clinical value of Epstein–Barr virus DNA levels in peripheral blood samples of Italian patients with Undifferentiated Carcinoma of Nasopharyngeal Type

We investigated EBV viremia in matched serum and peripheral blood mononuclear cells (PBMCs) from one of the largest Italian cohort of Undifferentiated Carcinoma of Nasopharyngeal Type (UCNT) patients (N=34). By using a LMP-1 real-time PCR assay, we found that EBV DNA detection rate was 74% (median 8417 copies/ml) and 24% (median 164 copies/106 cells) on serum and PBMCs, respectively. Significantly higher serum EBV DNA levels were detected in patients with advanced UCNT (nodal stage N2 versus N0–1 and N3 versus N0–1, P=0.03 and 0.018; overall stage IV versus I–II, P=0.03). During the follow-up, there was also a statistically significant difference of EBV DNA viral load between patients with and without clinical relapse (P=0.008). We concluded that serum EBV DNA reflects the biological activity of the UCNT and may be a prognostic factor also in a low-incidence region.