Evidence has shown that the abnormal expression of specific microRNAs (miRNAs) is associated with the occurrence,development and prognosis of pancreatic cancer,which is the potential target of forecast about invasion and metastasis of pancreatic cancer.There is close relation between miRNAs and biological characteristics of pancreatic cancer invasion and metastasis.Therefore,miRNAs are expected to become the new research targets of the mechanism of invasion and metastasis of pancreatic cancer.

Objective To analyse the risk factors of medical complications after hip fracture surgery.Methods Clinical data of 327 hip fracture patients undergoing surgical treatment in Beijing Haidian Hospital from January 2009 to December 2013 were retrospectively studied.There were 114 males and 213 females with a mean age of (75.1 ±15.6) years, 129 patients(39.4%) had femoral neck fractures, and 198 patients ( 60.6%) had intertrochanteric fractures.Fifty four patients had medical complications during hospitalization ( complication group) and 273 patients did not have complications ( non-complications group ) . The clinical features, presurgical comorbidities and operative parameters were documented and compared between two groups.The risk factors of medical complications were assessed by regression analysis.Results Univariate analysis showed that age ( t =2.85, P=0.007), lying in bed before fracture(χ2 =12.86,P =0.000), the history of chronic obstructive pulmonary diseases(COPD) (χ2 =9.45, P=0.000), coronary heart disease(χ2 =10.67,P=0.000), heart failure(χ2 =15.85,P=0.000), diabetes (χ2 =3.22,P=0.024), cerebrovascular disease(χ2 =4.21,P=0.008), anesthesia method(χ2 =8.67,P=0.018), American Society of Anesthesiologists(ASA) score ≥3 level(χ2 =2.01, P=0.042) and the delay time of operation (t=4.24, P=0.037) were significantly different between two groups.Multivariate regression analysis revealed that age(β=0.030, OR=1.030), lying in bed before fracture (β=2.303, OR=10.716), the history of COPD (β=0.831, OR =1.995), coronary heart disease(β=0.858, OR=2.392), heart failure(β=1.971, OR=7.333)and ASA score ≥3 level(β=0.809,OR=2.583) were the independent risk factors of medical complications after hip fracture surgery. Conclusion Age, lying in bed before fracture, the history of COPD, coronary heart disease, heart failure and ASA score≥3 level would increase the risk of postoperative medical complications for patients with hip fracture.

Objective To evaluate the effect of continuous passive motion (CPM) as an adjunct to active physiotherapy on pain and range of motion (ROM) after knee arthroplasty. Methods 20 female osteoarthritis patients (40 knees) undergoing bilateral knee arthroplasty were assigned into two groups. The experimental group received CPM and active physiotherapy twice a day while the control group received active physiotherapy only. They were assessed with visual analogue scale (VAS) and goniometer on pain and ROM of knee before and after operation. Results There were no statistical difference between these two groups for any outcome measures either 2 weeks or 3 months after operation (P>0.05), and they all improved in pain and ROM 3 months after operation compared with before (P<0.01). Conclusion CPM as an adjunctive therapy is not found to have an additional effect on pain or ROM 3 months after operation while active physiotherapy was used.

Objective:To explore the application value of X-ray tomographic fusion technique in assessing bone healing and osteotylus growth after femoral neck system(FNS)internal fixation of femoral neck fracture.Methods:A total of 18 patients with femoral neck fracture who admitted to the Department of Orthopedics of Beijing Haidian Hospital from October 2019 to June 2020 were selected.All of them were treated with FNS internal fixation,and conventional X-ray and X-ray tomographic fusion imaging were performed respectively at 1 month and 12 months after operation for them.The displays of the two imaging techniques for the bone healing and osteotylus growth after FNS internal fixation of femoral neck fracture were evaluated,and the relevant parameters of the two imaging techniques for the process of image detection of FNS internal fixation of femoral neck fracture were counted by statistical method.Results:The detection rate of X-ray tomographic fusion technique for osteotylus at 1 month after surgery was significantly lower than that at 12 months after surgery.The detection rates(94.44% and 61.11%)of X-ray tomographic fusion technique for osteotylus at 1 month and 12 months after surgery were significantly higher than those(61.11% and 33.33%)of X-ray(x2=5.100,5.790,P<0.05),respectively.The rank-sum test indicated there were significant differences in the distribution of the scores of the image qualities of osteotylus growths at 1 month and 12 months after surgery for patients with femoral neck fracture between two imaging techniques(Z=2.113,2.018,P<0.05),and there were significant differences in the image qualities of bone healing at 1 month and 12 months after surgery between two imaging techniques(Z=2.868,2.258,P<0.05).The display effect of the detection image of fracture site before treatment under the guidance of X-ray tomographic fusion technique was ideal,which images were clear and could display more fully and clearly the fracture line of patient.After 12 months of surgery,the continuous osteotylus that passed fracture line could be found at the anterior lateral position of X-ray,which has reached to clinical healing.In the process of detecting image of FNS internal fixation of femoral neck fracture,the air Kerma,dose area product and effective dose of X-ray tomographic fusion technique were significantly lower than those of conventional X-ray imaging(t=5.900,2.466,32.255,P<0.05),respectively.Conclusion:In the diagnosis and evaluation of bone healing of patients with FNS internal fixation after femoral neck fracture,the use of X-ray tomographic fusion technique can better detect the osteotylus growth of patients and judge the degree of bone healing,especially the judgment effect of that for the postoperative recovery with longer time of patients is more better.In addition,this technique has better safety,which would cause less radiation damage in the process of detection.

Objective Data from the HIV/AIDS surveillance sentinel sites was used to identify the recent HIV-1 infections and to estimate the HIV-1 incidence and epidemic trends among intravenous drug users (IDU),MSM,female sex workers and men attending the sexually transmitted disease clinics in Sichuan province.Methods Specimens collected from IDUs,MSM,female sex workers and men attending the sexually transmitted disease clinics sentinel sites were confirmed as HIV-I positive and tested with BED-CEIA.Annual HIV-1 prevalence and incidence rates were calculated and the incidence was adjusted by McNermar method.Results A total number of 194 223 serum specimens were collected and HIV antibody tested,with 5 297 HIV-1 positive.4 640 of the positives underwent BED-CEIA,with 749 identified as recent infections.During 2011-2015,HIV-1 incidence rates of the four types of population appeared as 5.16％ (95％CI:4.65-5.66),0.22％ (95％CI:0.16-0.28),0.57％(95％CI:0.45-0.69),7.53％ (95％CI:6.06-9.01) and 0.44％ (95％CI:0.36-0.53) respectively.Significant differences were seen in the HIV-1 incidence rates.Conclusions The HIV-1 incidence rates of IDUs from other sentinel sites in Sichuan province,female sex workers and men attending the sexually transmitted disease clinics appeared low,showing that the AIDS prevention and control activities worked effectively.However,the HIV-1 incidence of MSM was still at high level and even rising,suggesting that HIV-1 transmission between MSM and IDUs was possible.

The assay was used in HIV/AIDS surveillance sentinel sites to identify recent HIV?1 infection, to estimate HIV?1 incidence and understand the epidemic trends among men who have sex with men during 2011-2015.During 2011-2015, the HIV?1 incidence of men who have sex with men was 5.16%(95%CI: 4.65%-5.66%) in Sichuan Province. According to, a total of 9 cities had been divided into two type of regions: the first type(the proportion of live HIV/AIDS accounts for more than 0.1% of the permanent population, and the number of live HIV/AIDS has reached 500 cases and above) and the second type(the proportion of live HIV/AIDS accounts for 0.03% to 0.100% of the permanent population, and the number of live HIV/AIDS has reached 100-500 cases). During 2011-2015, the HIV?1 incidence of the second type was 4.24% (95%CI:3.72%-4.76%). The HIV?1 incidence of men who have sex with men was at a high level. The spread of HIV?1 to the second region was possible.

The assay was used in HIV/AIDS surveillance sentinel sites to identify recent HIV?1 infection, to estimate HIV?1 incidence and understand the epidemic trends among men who have sex with men during 2011-2015.During 2011-2015, the HIV?1 incidence of men who have sex with men was 5.16%(95%CI: 4.65%-5.66%) in Sichuan Province. According to, a total of 9 cities had been divided into two type of regions: the first type(the proportion of live HIV/AIDS accounts for more than 0.1% of the permanent population, and the number of live HIV/AIDS has reached 500 cases and above) and the second type(the proportion of live HIV/AIDS accounts for 0.03% to 0.100% of the permanent population, and the number of live HIV/AIDS has reached 100-500 cases). During 2011-2015, the HIV?1 incidence of the second type was 4.24% (95%CI:3.72%-4.76%). The HIV?1 incidence of men who have sex with men was at a high level. The spread of HIV?1 to the second region was possible.

Objective To explore the application of clinical teaching unit (CTU) in the process of pediatric resident standardization training. Method From August 2015 to December 2015, trainers in the department of neonatology were randomly divided into the experimental group and the control group; two groups had the same basic training plan and the same training time. The experimental group needed to par-ticipate in CTU activities outside the rule training plan. Trainers of the experimental group were evaluated by the formative evaluation method, and the theoretical assessment and questionnaire survey were carried out at the end of training. SPSS 18.0 was used for t test. Results The ability of clinical thinking of the experimental group trainers in the practice of CTU was improved, and the scoring rate rose from 57.0％ to 85.7％; the test scores of experimental group had different increase, in which case analysis reflected the ability of clinical thinking was significantly higher than the control group (P<0.05). Conclusion CTU can improve the trainers' independent clinical thinking and other abilities, and gradually help them complete the transition from medical students to physicians.

Dioxins, polybrominated diphenyl ethers, and benzo(a)pyrene are common organic pollutants in food. They have been of concern to academics and government administrations due to high residue and persistence, easy accumulation and strong harmful effects. The National Research Council of the United States of America published Toxicity Testing in the 21st Century: A Vision and Strategy in 2007, which proposed a new concept of toxicity testing that toxicity testing should take full consideration of population exposure data and base on in vitro tests, human cell lines, toxicity pathways and high?throughput screening. Meanwhile, systems biology, bioinformatics and rapid assay technologies will be used to better understand toxicity pathways—the cellular response pathways that can lead to adverse health effects when sufficient perturbing induced by chemicals exposure. The new toxicity testing strategy has changed the traditional testing pattern and has brought a wide impact on the international relevant fields. The European Union, the World Health Organization, and the United States Environmental Protection Agency, the Food and Drug Administration, and the National Center for Toxicological Research have organized relevant discussions and exploratory studies to address the new toxicity testing concept and how to evaluate and utilize the results of traditional toxicity test researches. Compared to the discussion,‘whether to do it’, ten years ago, the question,‘how to do it’, has become the concern of the current discussion. Therefore, how to respond to the concept of toxicity testing and how to effectively utilize and excavate traditional toxicity test data have been the focus of multi?disciplines and interdisciplinary academia such as toxicology, food hygiene and environmental science. Therefore, this article provides an overview of the exposure levels of dioxin, polybrominated diphenyl ethers and benzo[a]pyrene, which are typical persistent organic pollutants in food in China and the current research status of toxic pathways based on whole animal experiments. The exposure level, toxic effect and toxicity mechanism of three contaminants are analyzed and summarized in order to provide basis for future results based on the 21st century toxicity test compared with traditional tests and data mining analysis of these two kinds of data. Meanwhile, it also lays the foundation for the establishment of a toxicity testing framework based on exposure characteristics, toxic pathways, and biomarkers.

Dioxins, polybrominated diphenyl ethers, and benzo(a)pyrene are common organic pollutants in food. They have been of concern to academics and government administrations due to high residue and persistence, easy accumulation and strong harmful effects. The National Research Council of the United States of America published Toxicity Testing in the 21st Century: A Vision and Strategy in 2007, which proposed a new concept of toxicity testing that toxicity testing should take full consideration of population exposure data and base on in vitro tests, human cell lines, toxicity pathways and high?throughput screening. Meanwhile, systems biology, bioinformatics and rapid assay technologies will be used to better understand toxicity pathways—the cellular response pathways that can lead to adverse health effects when sufficient perturbing induced by chemicals exposure. The new toxicity testing strategy has changed the traditional testing pattern and has brought a wide impact on the international relevant fields. The European Union, the World Health Organization, and the United States Environmental Protection Agency, the Food and Drug Administration, and the National Center for Toxicological Research have organized relevant discussions and exploratory studies to address the new toxicity testing concept and how to evaluate and utilize the results of traditional toxicity test researches. Compared to the discussion,‘whether to do it’, ten years ago, the question,‘how to do it’, has become the concern of the current discussion. Therefore, how to respond to the concept of toxicity testing and how to effectively utilize and excavate traditional toxicity test data have been the focus of multi?disciplines and interdisciplinary academia such as toxicology, food hygiene and environmental science. Therefore, this article provides an overview of the exposure levels of dioxin, polybrominated diphenyl ethers and benzo[a]pyrene, which are typical persistent organic pollutants in food in China and the current research status of toxic pathways based on whole animal experiments. The exposure level, toxic effect and toxicity mechanism of three contaminants are analyzed and summarized in order to provide basis for future results based on the 21st century toxicity test compared with traditional tests and data mining analysis of these two kinds of data. Meanwhile, it also lays the foundation for the establishment of a toxicity testing framework based on exposure characteristics, toxic pathways, and biomarkers.