Enhancing the efficiency of Epstein-Barr viral serologic test in the diagnosis of nasopharyngeal carcinoma / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To investigate the efficiency of concurrent application of VCA-IgA, EA-IgA and EA-IgG serological tests in diagnosing nasopharyngeal carcinoma (NPC).</p><p><b>METHODS</b>The sera of 266 untreated NPC patients and 347 healthy adults were collected. In addition to the conventional immunoenzymatic method of VCA-IgA test, enzyme-linked immunosorbent assay (ELISA) was adopted as an alternative to test the antibody level of EA-IgG and EA-IgA. A new statistical formula was used to evaluate the odds ratio of different combinations of these three tests.</p><p><b>RESULTS</b>The sensitivity and specificity of VCA-IgA, EA-IgG and EA-IgA concurrently were as high as 95.11% and 97.41%, respectively, which were higher than those of single test (90.60% and 94.52% for VCA-IgA, 93.98% and 93.66% for EA-IgG, 89.84% and 88.18% for EA-IgA). Furthermore, the odds ratio of 3-test positivity (1 912.5) was higher than those of 2-test positivity (27.903 2 for VCA-IgA and EA-IgG, 11.169 0 for EA-IgG and EA-IgA, 8.032 8 for VCA-IgA and EA-IgA), which were even higher than those of 1-test positivity (0.121 4 for VCA-IgA, 0.170 5 for EA-IgG and 0.048 8 for EA-IgA).</p><p><b>CONCLUSION</b>ELISA is more accurate in reflecting the antibody level of EA-IgG and EA-IgA than the conventional immunoenzymatic method. The concurrent application of VCA-IgA, EA-IgG and EA-IgA test can markedly improve the sensitivity, specificity and odds ratio as well, thus resulting in enhancing the efficiency of diagnosing nasopharyngeal carcinoma serologically.</p>

Determination of Selenium Contents for Some Chemical Forms in Rice Rich-Selenium / 中山大学学报(医学科学版)

【Objective】 Selenium (Se) contents of some chemical forms as total Se,inorganic Se,organic Se and selenomethionine (SeMet) in rice e nriched-Se were determined, in order to provide scientific basis for applying r ice enriched-Se to cancer prevention. 【Methods】 Fluorometric determination wi th 2,3-diaminonaphthalene (2,3-DAN) for total Se, inorganic Se and organic Se, and with CNBr-2,3-DAN for SeMet. 【Results】 Total Se contents of rice enrich ed-Se reaping in summer and autumn were (2.71±0.97) μg/g, (9.87±1.18 ) μg/g, respectively, both higher than that of ordinary rice (P<0.001); the organic Se occupying over 99% of total Se were 2.68, 9.77 μg/g, respectively . Main component of the organic Se was SeMet, and its Se content (Se-SeMet) was (1.45±0.67) μg/g for rice enriched-Se reaping in summer, (4.96±0.98) μ g/g in autumn,and their contents/total Se contents were 53.5, 50.5 %, respecti vely. 【Conclusions】 Most part of Se in rice enriched-Se was natural organic Se and main component of the organic Se was SeMet.