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Advances in Brief |
Departments of Clinical Oncology [R. K. C. N., T. T. C. Y., W-W. C., W. C. S. C., V. W. S. M., S-K. A., C-K. L., W-H. L.] and Pathology [J. K. C. C.], Queen Elizabeth Hospital, and Gene Pro Laboratory Limited [K-K. W.], Hong Kong Special Administrative Region, China
Purpose: The purpose of this work was to study the sera of patients with lymphoepithelioma-like carcinoma (LELC) of the lung for circulating EBV DNA.
Experimental Design: Prospectively collected serum samples from five female patients with advanced, inoperable LELC of the lung were measured for free circulating EBV DNA using a quantitative PCR technique. EBV-encoded small RNA (EBER)-1 was assayed in serial serum samples of three of the five patients, either from the start or during the initial phase of chemotherapy/radiotherapy until their terminal event or last follow-up. There was only a single-point sample for analysis in the fourth and fifth patients. Six other patients with LELC of the lung were also retrospectively identified, and their sera were tested for EBER-1 at either the first visit plus the last follow-up visit (n = 2), the first visit only (n = 2), or the last follow-up visit only (n = 2).
Results: Prospectively collected serum samples from five patients and retrospectively collected serum samples from two patients who had clinical disease at initial serum measurement showed detectable levels of EBER-1. Retrospectively collected serum samples from four patients with no clinical disease had negative sera. There is consistent correlation between the clinical response to treatment and subsequent clinical course of LELC and serum EBER-1 levels in the three prospective patients with longitudinal serum monitoring.
Conclusions: This study shows for the first time that free EBV DNA can be detected in the serum of patients with LELC of the lung and further suggests the feasibility of its use for monitoring response to therapy in advanced cases.
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