Objective To assess quantitatively the association between smoking and the risk of disease and death from pulmonary tuberculosis(TB) by a meta-analysis. Methods Both Chinese and English literatures published from Jan. 1999 to Jun. 2010 about the case-control study of the association between smoking and pulmonary TB were retrieved by searching the electronic resource databases. A meta-analysis was then performed on the comparison and synthesis of findings from included studies. Pooled odds ratio (OR) and 95% confidence interval (CI) were calculated using a software RevMan 4.2. Finally,possible publication bias was tested and a sensitivity analysis was conducted. Results The meta-analysis for total 22 high-quality case-control studies found a pooled OR of 2.56 (95% CI 1. 80 ～3.64) with a random-effects model. Sensitivity analysis showed that pooled OR was 2.56 (95% 1.76 ～3.71 ) by removing two papers of nested case-control study. The OR were 2.13 (95% CI1.76～2.58) and 4.60 (95% CI 1.81～11.69) for disease and death from TB,respectively. After confounding factors,including age and gender,had been controlled the OR was 2.53 (95% CI 1.27 ～5.03 ) whereas 1. 99(95% CI 1.54 ～ 2.56 ) without control of them. Conclusion Smoking can increase the risk of incidence and death of TB. TB control programs and treatment of patients might benefit from interventions aimed at reducing tobacco exposure.

Objective To analyze the correlation between the polymorphism of PTPN22 gene (R620W and R263Q sites)and pulmonary tuberculosis(TB)in Chinese Han population and to investigate the environmental factors associated with pulmonary TB. Methods A case-control study was conducted on 235 patients with pulmonary TB and 251 healthy subjects. The single nucleotide polymorphisms(SNP)of PTPN22 gene at R620W and R263Q sites were detected by the assay of polymerase chain reaction and re-striction fragment length polymorphism(PCR-RFLP). A questionnaire was designed to gather information about tuberculosis-associated environmental factors. Univariate and multivariate logistic analysis were con-ducted. Results Genotype frequencies of PTPN22 R620W(C1858T)SNP were 233(99. 15% ,CC),2 (0. 85% ,CT),0(0% ,TT)in patients with pulmonary TB and 240(95. 62% ,CC),11(4. 38% ,CT), 0(0% ,TT)in healthy subjects. There was a difference with the distribution of PTPN22 C1858T allele be-tween patients with pulmonary TB and healthy subjects[0. 43% vs 2. 19% ,P = 0. 01,odds ratio(OR)=0. 19,95% confidence interval(CI)= 0. 07-0. 35]. Genotype frequencies of PTPN22 R263Q(G788A) were 218(92. 77% ,GG),17(7. 31% ,GA),0(0% ,AA)in patients with pulmonary TB and 248 (98. 71% ,GG),3(1. 29% ,GA),0(0% ,AA)in healthy subjects. The frequencies of G788A allele in patients with pulmonary TB were higher than those in healthy subjects(3. 62% vs 0. 60% ,P﹤0. 01,OR=6. 03,95% CI=2. 12-18. 38). Conclusion The results of this study suggested that the R263Q GG geno-type of PTPN22 gene was associated with the susceptibility to TB in Chinese Han population.

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