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The objective of this study was to investigate the diagnostic significance of EBV antibody combined detection for nasopharyngeal carcinoma (NPC) in a high incidence region of southern China. Two hundred and eleven untreated NPC patients, 203 non-NPC ENT patients, and 210 healthy controls were recruited for the study. The titers of VCA/IgA and EA/IgA were assessed by immunoenzyme assay, and the levels of Rta/IgG and EBNA1/IgA were determined by enzyme-linked immunosorbent assay. The levels of VCA/IgA, EA/IgA, Rta/IgG and EBNA1/ IgA demonstrated no association with gender or age (p>0.05). The receiver operating characteristic curve and the area under the curve were used to evaluate the diagnostic value. The sensitivity of VCA/IgA (98.1%) and the specificity of EA/IgA (98.5%) were the highest. When a logistic regression model was used to combine the results from multiple antibodies to increase the accuracy, the combination of VCA/IgA+Rta/IgG, whose area under the curve was 0.99, had the highest diagnostic efficiency, and its sensitivity, specificity and Youden index were 94.8%, 98.0% and 0.93 respectively. The data suggest that the combination of VCA/IgA+Rta/IgG may be most suitable for NPC serodiagnosis.

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This study was aimed to investigate the roles of serum macrophage inflammatory protein-3α (MIP-3α) and cystatin A in nasopharyngeal carcinoma (NPC) prognosis. The serum levels of MIP-3α and cystatin A in 140 primary NPC patients without distant metastasis were detected by enzyme-linked immunosorbent assay before and after treatment. The results were compared with those in 100 healthy controls. The log-rank test was used to compare survival curves of the 2 groups. Multivariate analysis of prognostic factors used Cox proportional hazards regression model. Serum levels of MIP-3α and cystatin A in pretreatment patients with NPC were higher than those in healthy controls. Concentrations of these 2 factors in the majority of patients after the therapy decreased to control level. Patients with high serum level of MIP-3α and cystatin A before treatment had poorer overall survival (OS), local recurrence-free survival, and distant metastasis-free survival than the ones with low level. In addition, serum pretreatment MIP-3α and cystatin A levels were independent prognostic factors for OS and distant metastasis-free survival of NPC patients; serum posttreatment MIP-3α and cystatin A levels were independent prognostic factors of local recurrence-free survival. Our results revealed that serum MIP-3α and cystatin A may be promising candidate prognostic factors for NPC, and higher serum levels of MIP-3α and cystatin A correlate with shorter probability of OS, local recurrence, and distant metastasis.

The human leukocyte antigen (HLA) region is the most polymorphic in the human genome, which located on the chromosome 6p21 encodes more than 200 genes.