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Objective To detect the distribution of resistance-nodulation (RND)efflux pump system of Acineto-bacter baumannii (AB),and explore the relationship between its’expression and antimicrobial resistance.Methods Fifty-nine strains of multidrug-resistant AB isolated from clinical specimens in The First Affiliated Hospital of Nan-chang University were identified and performed antimicrobial susceptibility analysis,distribution of RND efflux sys-tem of AB was detected by polymerase chain reaction(PCR),expression of efflux pump genes in different drug-re-sistant phenotypes of AB was compared,relationship between the expression level and drug resistance was analyzed, amplified products of RND efflux system were sequenced.Results Resistance rates of AB to ampicillin/sulbactam, imipenem,gentamicin,ciprofloxacin,and levofloxacin were 93.2%,94.9%,88.1%,96.6%,and 52.5% respec-tively.PCR detection results of efflux pump and integron genes of 59 AB strains revealed that the carrying rates of adeR,adeS,adeB,adeJ,and adeG genes were 81.4%,91.5%,93.2%,100.0%,and 61.0% respectively.The expression of efflux pump genes in different strains was different,expression levels of ade B and adeJ genes among gentamicin,imipenem,ampicillin/sulbactam resistant AB group and non-resistant AB group were significantly dif- ferent (all P＜0.05).There was no mutation or insertion sequence in the base sequences of regulatory genes ade R and ade S of adeABC efflux pump.Conclusion RND efflux pump system is universally present in AB,the expres-sion upregulation of ade B and ade J genes in RND efflux pump system is related with antimicrobial resistance of bacteria to gentamycin,imipenem,and ampicillin-sulbactam.
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<p><b>OBJECTIVE</b>To evaluate and analyze prognostic factors for surgical treatment of patients with neoadjuvant chemotherapy.</p><p><b>METHODS</b>Records of 256 patients who underwent operation after chemotherapy for lung cancer from June 1995 to May 2007 were reviewed retrospectively. Potential prognostic factors which were univariately and multivariately analyzed by COX proportional hazard regression model, included gender, age, p-TNM stage, size of tumor, metastasis of lymph node, histological type and operation extent. Kaplan-Meier method was used for survival curve and rate. However, survival difference was calculate by Log-rank test.</p><p><b>RESULTS</b>Eleven patients (4.3%) developed postoperative complications. Two hundred and thirty-six patients (92.2%) underwent radical resection (169 for lobectomies, 53 for pneumonectomies and 14 for extended resections). On the contrary, 20 cases had palliative resection. The overall 1-, 3- and 5-year survival rate was 79.3%, 38.7% and 27.0% respectively. Age, p-TNM stage, size of tumor, metastasis of lymph node and type of operation were valued as prognostic factors in COX univariate analysis, p-TNM stage (OR = 1.323, 95% CI: 1.068 to 1.641, P = 0.017) and age (OR = 1.562, 95% CI: 1.148 to 2.125, P = 0.005) were identified independent prognostic factors in COX multivariate analysis.</p><p><b>CONCLUSIONS</b>Long-term outcome for lung cancer of patients with neoadjuvant chemotherapy are encouraging, p-TNM stage and surgical type are the crucial prognostic factors for surgical treatment of patients with neoadjuvant chemotherapy.</p>