Abstract:
:This hospital-based cohort study evaluated the efficacy of three Epstein-Barr virus (EBV) - associated assays for nasopharyngeal carcinoma (NPC) primary screening and monitoring treatment outcome. Five hundred and seventeen consecutive subjects, including 156 NPC patients, 264 healthy volunteers and 97 patients with head and neck squamous cell carcinoma (HNSCC) were enrolled. The sensitivity and specificity of EBV IgAs to viral capsid antigen (VCA), complementary EBV IgAs to early antigen and nuclear antigen-1 (EA+EBNA-1), and EBV DNA load were examined by immunofluorescent assays, enzyme-linked immunosorbent assays, and quantitative real-time PCR, respectively. After constructing the receiver operating characteristics to demonstrate screening efficacy, EBV EA+EBNA-1 IgA (AUC: 0.952; 95% CI, 0.930-0.974) was proved superior to EBV VCA IgA (AUC: 0.888; 95% CI, 0.854-0.922) or EBV DNA load (AUC: 0.893; 95% CI, 0.854-0.932) in differentiating NPC patients from controls. Comparison of screening efficacy between NPC patients and HNSCC patients revealed EBV EA+EBNA-1 IgA (AUC: 0.964; 95% CI, 0.943-0.985) still outperformed EBV VCA IgA (AUC: 0.884; 95% CI, 0.845-0.923). In subjects with higher serum titer or level equal to or above 1:80 and 6 EU/ml for EBV VCA IgA and EA+EBNA-1 IgA, the specificity reached as high as 99.2% and 95.1%, respectively, in the control groups. However, correlation of these three assays with clinicopathological manifestations of NPC, revealed only EBV DNA load significantly associated with N stage and overall stage in NPC patients. Additionally, EBV DNA load could be used to further raise the specificity of EBV EA+EBNA-1 IgA assays and was also the only assay to be consistently predictive of tumor relapse in post-treatment patients according to serial test results by time frame. Consequently, an EBV EA+EBNA-1 IgA-based protocol is recommended for mass screening, but EBV DNA load should be used solely for post-treatment monitoring for NPC in endemic areas.
journal_name
Oral Oncoljournal_title
Oral oncologyauthors
Chang KP,Hsu CL,Chang YL,Tsang NM,Chen CK,Lee TJ,Tsao KC,Huang CG,Chang YS,Yu JS,Hao SPdoi
10.1016/j.oraloncology.2007.10.003subject
Has Abstractpub_date
2008-08-01 00:00:00pages
784-92issue
8eissn
1368-8375issn
1879-0593pii
S1368-8375(07)00279-5journal_volume
44pub_type
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