Chemokines are a class of functional chemotactic peptide. CXC chemokine class is a large family of chemokines in a sub- tribe. In the occurrence and development of tumor cells, there often accompanied by a series of molecular and biology change. CXC chemokine subfamily is closely related to the body' s immune response to tumor and biological behaviors of tumor. In this paper, CXC chemokine sub-Several members of the tribe and their receptor and tumor biological relationship are reviewed.

In the process of epithelial-mesenchymal transition (EMT),cell-cell adherence is disrupted,apico-basal polarity is lost,the ability of anti-apoptosis,migration and invasion is acquired.Y-box-binding protein 1 (YB-1) is a member of the cold-shock protein superfamily,containing a structurally and functionally conserved cold shock domain.Studies indicate that YB-1 can promote the occurrence and development of tumors by regulating EMT.In the process of EMT mediated by YB-1,various transcription factors and signal pathways play important roles.

Objective To probe into application of clinical pathway on clinical practice teach-ing in thoracic surgery , and evaluate its effect . Methods 76 students were randomized into two groups: 35 students who accepted clinical pathway teaching were the experimental group, they were asked to carry out clinical practice in accordance with the teaching pathway;and the other 41 students were control group. The final examination included four parts: ①theoretical examination account for 20%of the total score. The test paper was randomly combined from the standardized question bank of Xinjiang Medical University, and this test included single choice questions and fill-in questions; ②clinical operational skills test account for 30%of the total score. This part included pleural puncture, dressing change, stitches remove, incision disinfection and surgical draping, and all of these opera-tions were carried out on medical patient simulators; ③clinical case analysis account for 50% of the total score. This part involved history collection, physical examination, humanistic care, case writing, diagnosis and treatment planning for new admission patients. T-test of independent samples was used to analyze all the scores of the two groups. Results The clinical case analysis score and the total score in experimental group [(42.26 ±3.93) points and (81.69 ±6.16) points, respectively]were obviously higher than that in control group[(38.88±4.76) points and(77.39±6.83) points, respectively];There were significant differences between the two groups(P values was 0.001 and 0.006, respectively). Conclusion Application of clinical pathway in clinical practice teaching may improve the effect of clinical teaching. The pathway contents and evaluation methods should be constantly improved accord-ing to teaching practice.

Objective To investigate the effects of high-fat diet on the formation of colorectal adenomas in rats.Methods Twenty Wistar rats were evenly divided into two groups,one group were fed with common food and the other group were fed with high fat-diet.The rats of two groups were intraperitoneally injected with 1,2-dimethyl-hydrazine (DMH) (40 mg/kg) once a week for 10 consecutive weeks.Rats with common diet and DMH were assigned to SDT group,and those with high-fat diet and DMH were assigned to HFDT group.The expression of Ki-67 was detected by immunohistochemistry and the expression of proliferating cell nuclear antigen (PCNA) and cyclooxy-genase 2 (COX2) was detected by immunofluorescence.The levels of serum triglyceride,cholesterol,insulin like growth factor-1 (IGF-1),insulin,leptin and tumor necrosis factor-α were determined by enzyme linked immunosorbent assay.Student's t test and Mann-Whitney test were performed for statistical analysis.Results At the 18th week,the numbers of Ki-67 positive cells of SDT group and HFDT group were 24.00± 1.84 and 75.17 ± 3.17,respectively,and the difference was statistically significant (t=13.960,P＜0.01).The fluorescence intensity of PCNA of SDT group and HFDT group was 213.70±21.61 and 333.30±30.44,respectively,and the difference was statistically significant (t =4.987,P＜0.01).The levels of serum triglyceride of SDT group and HFDT group were (0.43 ± 0.05) mmol/L and (1.14±0.07) mmol/L,respectively,and the difference was statistically significant (t=8.366,P＜0.01).The levels of cholesterol were (3.75±0.'26) pmol/L and (7.77±0.79) pmol/L,respectively,and the difference was statistically significant (t=4.851,P＜0.01).Conclusion High-fat diet can promote the genesis and development of adnomas through influencing the body's endocrine metabolism,increasing cell proliferation cycle and regulating inflammatory reaction.

Objective To clarify the anatomical and pathlogical implications of Denonvilliers' fascia.Method In this study,thirty pelvic specimens (17 males and 13 females) were incised through the median sagittal plane and carried for regional anatomy study; Denonvilliers' fascia was identified by immunohistochemistry.Results Denonvilliers' fascia could be found in all male specimens:it had an anterior leaf and a posterior leaf,with the anterior one attaching to seminal vesicle,seminiferous duct,prostate and the bottom of bladder firmly.The fascia originated at the fold of the peritoneum and ended at the perineum fascia,fusing into the pelvic parietal fascia laterally.It was not obvious in females,only to find a thin and transparent membrane between vagina and rectum.The maximum height of Denonvilliers' fascia in left pelvis was (3.2 ± 0.3) cm,compared with (3.3 ± 0.3) cm in the right pelvis (t =0.965,P ＞ 0.05).Immunohistochemistry study revealed that there was no lymph node in the fascia and its lateral parts were enriched of nerve fibers,which were few in its middle part.Conclusions The unique anatomical and pathlogical characteristics of Denonvilliers' fascia are of vital importance to the avoidance of nerve injury during rectal surgery.

Objective To explore the effect of fat on 1,2-dimethylhydrazine (DMH)-induced colon tumors.Methods A total of 50 7-week-old male Wistar rats were further divided into four groups:standard diet feed control group (n =10),standard diet feed plus DMH-induced tumor group (SDT,n =15),high-fat diet feed control group (n =10) and high-fat diet feed plus DMH-induced tumor group (HFDT,n =15).Rats were killed 18 weeks later,and enzyme-linked immunosorbent assay was used to detect serum triglyeeride,tumor necrosis factor (TNF-α),and colonic TNF-α,interleukin-6.After the intestinal tracts were removed,the location,amount,and size of the tumors were observed.The pathological changes of the tissue sections were observed,and the distributions of TNF-α and Ki-67 in the normal tissues and tumors were detected by immunohistochemistry.Results Upon the completion of the study,the mortality rate of rats was 20.00％ in the SDT group and 26.67％ in the HFDT group,the tumor formation rate was 75.00％ in the SDT group and 81.82％ in the HFDT group,and the tumor-bearing rate was 117％ in the SDT group and 191％ in the HFDT group.No statistical significance difference between the two groups in mortality rate,tumor formation rate (P =0.545) and tumor bearing rate (x2 =1.343,P =0.247).The average tumor volume was significantly different between the standard diet feed control group and high-fat diet feed control group (28.57％ vs 66.67％,P =0.030).Also,the serum triglyceride and TNF-α levels significantly differed between the SDT group and HFDT group [TG (1.39 ± 0.31) mmol/L and TNF-α (124.80 ± 21.69) ng/L in the HFDT group and TG (0.46 ±0.20) mmol/L and TNF-α (85.83 ± 17.45) ng/L in the SDT group] (P =0.000).The expressions of TNF-α,IL-6,and Ki-67 in colonic mucosa were significantly higher in the high-fat diet feed control group than in the standard diet feed control group [TNF-α:(6.22 ± 0.63) ng/g vs (2.33 ± 0.44) ng/g,P=0.020; IL-6:(13.50±0.67) ng/gvs (7.31 ±0.41) ng/g,P=0.000; and Ki-67:40％ vs 10％,P =0.028].The Ki-67 expression rate was 90.48％ in the HFDT group,compared to 50％ in the SDT group (P =0.015).Conclusions High-fat diet can increase the serum triglyceride and TNF-α levels in rats,upregulate the expressions of TNF-α,IL-6 and Ki-67,and thus promote inflammation and cell proliferation,and ultimately affect the tumor formation and development.However,the effect of fat on DMH-induced colon tumors warrants further studies.

Objective: To explore the relationship of sleep quality and emotional regulation difficulties in middle school students, and to analyze its mediating role of daytime dysfunction, social rejection and selfcontrol ability, so as to provide a scientific reference for improving middle school students mental health. Methods: From October to November, 2023, the Pittsburgh Sleep Quality Index, Adolescent Social Rejection Questionnaire, Brief Selfcontrol Scale and Difficulties in Emotion Regulation Scaleshort Form (DERS-16) were used to assess 806 students recruited from four middle schools in Bengbu City by a convenient cluster random sampling method. And model-6 of PROCESS and 5 000 Bootstraps were used to make a chainmediating model analysis. Results: Daytime dysfunction was positively correlated with sleep quality(r=0.57), social rejection(r=0.19), selfcontrol(r=0.29, P＜0.01). Selfcontrol was positively correlated with emotional regulation difficulties(r=0.54, P<0.01).Poor sleep quality showed a significant positive association with on daytime dysfunction, and daytime dysfunction further affected social rejection, selfcontrol ability and emotional regulation difficulties (β=0.86, 0.60, 1.27, 1.56, P<0.05). Meanwhile, daytime dysfunction, social rejection and selfcontrol played a serial mediating role in the relationship between sleep quality and emotional regulation difficulties (Estimate=0.11,95%CI=0.04-0.20,P<0.05). Conclusion The study reveals the complex relationship between sleep quality and emotional regulation difficulties in middle school students and provides a new theoretical basis for adolescent sleep improvement and mental health interventions.

Objective    To investigate the clinical efficacy of video-assisted thoracoscopic surgery (VATS) and pleurodesis for spontaneous pneumothorax. Methods    A retrospective analysis of 157 patients with spontaneous pneumothorax undergoing VATS from January 2012 to March 2016 in our hospital was done. According to different treatments, patients were divided into two groups: a group A (65 patients receving pleurodesis, 52 males and 13 females with a mean age of 34.77 years ranging from 17 to 73 years) and a group B (92 patients without pleurodesis, 76 males and 16 females with a mean age of 34.66 years ranging from 16 to 72 years). In the group A 29 patients underwent closed thoracic drainage; while in the group B there were 39 patients. Results    The patients were followed up for 3 months to 4 years. The recurrence rate of the group A was lower than that of the group B, but the difference was not statistically significant. For patients receving closed thoracic drainage preoperatively, intraoperative drainage volume at postoperative 24 h in the group A was more than that of the group B, but postoperative hospital stay was less than that of the group B (P<0.05). For patients not receving closed thoracic drainage preoperatively, drainage volume at postoperative 24 h, total drainage volume, postoperative hospital stay in the group A were more than those of the group B (P<0.05). Conclusion    Pleurodesis can not reduce the recurrence rate of spontaneous pneumothorax. Preoperative closed thoracic drainage combined with intraoperative pleurodesis can effectively reduce postoperative hospitalization; therefore pleurodesis is recommended. If preoperative closed thoracic drainage is not adopted, surgery without pleurodesis can effectively reduce thoracic drainage at postoperative 24 h, total drainage volume and hospital stay and the perioperative results are better; therefore mechanical pleurodesis is not recommended.