In a large-scale screening in Zhongshan, the sensitivity and specificity of P85-Ab for detecting NPC were found to be 97.5% and 98.3%, respectively, whereas those of the combination of P85-Ab, VCA-IgA and EBNA1-IgA were found to be 70.2% and 99.8%, respectively 29. This evidence concerns the gene CD79A and nasopharyngeal carcinoma.