Establishment of EA-D-IgA antibody detection method and its diagnostic efficacy for nasopharyngeal carcinoma in different clinical stage / 肿瘤研究与临床

ABSTRACT

Objective To establish a serological detection method for EA-D-IgA antibody,and to evaluate its diagnostic efficacy for nasopharyngeal carcinoma in different clinical stage.Methods EA-D-IgA antibody serological detection method was established by using the polypropylene microplate with eukaryotic expression product of BMRF1 whole gene fragment of EB virus.Fifteen early stage (stage Ⅰ and Ⅱ) and 48 advanced (stage Ⅲ and Ⅳ) patients with nasopharyngeal carcinoma in Shanxi Provincial Cancer Hospital and Shanxi Dayi Hospital from April 2012 to August 2017,and serum samples from 40 patients with rhinitis who were treated at Shanxi Dayi Hospital from October 2016 to October 2017 were examined respectively by using the constructed EA-D-IgA antibody detection method.The positive detection rate of EA-D-IgA antibodies in different groups was calculated.When the patients with rhinitis were used as the differential control,the diagnostic efficacy of this index for different stages of nasopharyngeal carcinoma was evaluated.Results EA-D-IgA antibody serological method was successfully established.The positive detection rate of EA-D-IgA antibody in early nasopharyngeal carcinoma,advanced nasopharyngeal carcinoma and rhinitis control was 60.0 ％ (10/15),68.3 ％ (33/48) and 5.0 ％ (2/40) respectively.The differences between early stage nasopharyngeal carcinoma and the rhinitis control,advanced nasopharyngeal carcinoma and the rhinitis control were statistically significant (x2 =20.625,P =0.000;x2 =37.017,P =0.000).The difference between early nasopharyngeal carcinoma and advanced nasopharyngeal carcinoma was not statistically significant (x2 =0.394,P =0.530).When compared with the patients with rhinitis,the diagnostic sensitivity,specificity,positive predictive value,negative predictive value was 60.0 ％ and 68.3 ％,95.0 ％ and 95.0 ％,81.8 ％ and 94.3 ％,86.4 ％ and 71.7 ％ respectively in early nasopharyngeal carcinoma and advanced nasopharyngeal carcinoma.Conclusion The method constructed in this study effectively improves the efficacy of EA-D-IgA antibody detection in serological diagnosis of nasopharyngeal carcinoma,which can be used as an adjunct for early diagnosis of nasopharyngeal carcinoma,yet not as a reference for clinical staging.