ObjectiveTo investigate the genetic polymorphisms of 21 short tandem repeat(STR)loci (D3S1358, D13S317, D7S820, D16S539, Penta E, D2S441, TPOX, TH01, D2S1338, CSF1PO, Penta D, D10S1248, D19S433, vWA, D21S11, D18S51, D6S1043, D8S1179, D5S818, D12S391 and FGA). Methods A total of 560 blood samples were collected from unrelated healthy individuals of Han population in Hunan Province. Chelex-100 extraction method was applied to the extraction of genomic DNA, and an AGCU EX22 Kit and 9700 STR amplification was used in amplification reactions. The products were separated and analyzed on 310 Genetic Analyzer.ResultsA total of 248 alleles were observed, the al-lelic frequencies ranging from 0.001 to 0.518. Observation of genotype distributions for each locus showed no deviations from Hardy-Weinberg equilibrium exceptPentaE(P=0.023). The combined pow-er of discrimination, combined power of exclusion, and combined matching probability of the 21 STR loci were approximately 0.999 999 999 999 999 999 999 999 8, 0.999 999 998, and 1.36×10-25, respectively. ConclusionThe 21 STR loci show high polymorphisms in the Han population, which can provide valu-able data and a theoretical basis for forensic individual identification and paternity testing.

Objective:To investigate the potential risk factors of the tumor abnormal protein (TAP) in papillary thyroid carcinoma (PTC) and analyze the clinical significance of TAP.Methods:The clinical data of 792 patients who underwent thyroid surgery in the thyroid surgery department of the First Affiliated Hospital of Zhengzhou University from Jun. 2018 to Jun. 2019 was collected, of whom 564 were PTC patients and 228 were benign thyroid tumor patients. Patients were divided into two groups by postoperative pathology: PTC group and thyroid benign tumor group. The potential risk factors the TAP in PTC were analyzed by univariate and multivariate Logistic regression analysis, and then the diagnostic value of TAP for PTC was assessed by ROC curve analysis.Results:Multivariate analysis showed that tumor maximum diameter (≥1.0 cm) ( OR:1.555; 95% CI: 1.031~2.344, P=0.035) and multifocal tumor ( OR:1.789; 95% CI: 1.098~2.916, P=0.019) were risk factors for elevation of TAP. Gender, age, body weight, extracapsular extension of cancer, invasive growth of cancer, Hashimoto's thyroiditis, central lymph node metastasis, lateral lymph node metastasis, and BrafV600E mutation were not associated with TAP ( P>0.05) . TAP in patients with PTC was significantly higher than that in patients with benign thyroid tumors[ (122.36±49.37) μm 2 vs (105.04±40.61) μm 2, P<0.001]. The sensitivity and specificity of TAP in diagnosing PTC were 78.90% and 40.35%, respectively. Conclusions:Tumor maximum diameter (≥1.0 cm) and multifocal tumor in PTC were risk factors for elevation of TAP. TAP has certain clinical value in differentiating PTC and thyroid benign tumor, which could be used as an auxiliary indicator.