Abstract
Objective To discuss the diagnostic value of serum sialic acid for glioma. Methods A retrospective study was conducted. The levels of sialic acid in serum samples of 95 glioma patients, 175 patients with brain benign tumor and 400 normal persons from October 2014 to March 2015 were detected by automatic biochemistry analyzer using enzymic method. The SNK-q test and analysis of variance were used to compare the difference of the groups. By making receiver operating characteristic (ROC) curve, the cut-off value, sensitivity, specificity, positive predictive value and negative predictive value were calculated to assess the diagnostic value of serum salivary acid. Then the cut-off value was validated by using the serums of 30 glioma patients and 30 normal persons who were out-patients and healthy controls. Results The levels of serum sialic acid in patients with gliomas, patients with brain benign tumor and healthy individuals were (0.66±0.14 ) g/L, (0.61±0.09 )g/L, (0.54±0.07 )g/L. The serum salivary acid of glioma patients were higher than brain benign tumor patients (q=6.74, P 0.05) among the glioma patients of different grades (8 of gradeⅠ, 32 of gradeⅡ, 24 of grade Ⅲ, 31 of grade Ⅳ). There was no significant difference between the low grade patients (grade Ⅰand Ⅱ) and the high grade patients (grade Ⅲ and Ⅳ) (t=0.55, P>0.05), but the level of serum sialic acid of high grade group had an increasing trend than the low grade group. The area under the ROC curves was 0.79. The cut-off value of serum salivary acid for diagnosing glioma was 0.61 g/L. The sensitivity was 67.74%, and the specificity was 80.60%. The positive predictive value was 44.68%, and the negative predictive value was 90.76%. Then the cut-off value was used as a diagnostic criteria, and the detected results of 30 glioma patients and 30 normal persons showed that the sensitivity was 63.30% and the specificity was 83.30%. Conclusions The serum sialic acid has good specificity and negative predictive value for diagnosing glioma. It may be a valuable diagnostic marker.(Chin J Lab Med, 2016, 39: 201-204) Key words: Glioma; Sialic acids; Diagnostic techniques and procedures; Sensitivity and specificity
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