One hundred and twenty-four male wistar rats were allocated rendomly to control and SOD group. The tensile strength, hydroxyproline contents and histologic changes of colonic anastomosis and MDA contents in plasma were observed on the 1st, 3rd, 7th day after surgery. The results show tensile strength and hydroxypr-oline contents in SOD group were much higher than that in control (P

The standard surgery intern orientation is very important. The surgery intern orien-tation is completed by surgery education division (SED) in the U.S.A. The orientation includes speech from director of surgery department. the interaction part presided by surgical teachers, topic groups for discussing. Then the faculties of SED will explain the core competences which are required by accred-itation council on graduate medical education (ACGME), educational activities of department, the re-view process for resident physicians. The orientation also includes occupation development plan for residents; manners, teamwork and communication to patients; surgical basic skills training, system management, feedback and evaluation etc. The expectation of this article is for the improvement of Chinese surgery intern orientation.

Oxaliplatin is effective for the treatment of advanced colorectal cancer,but its application is restricted because of the dose-limiting toxicity.As drug carriers,liposomes are featured with delay release,lesion targeting and they could decrease the side effects of drugs.Active targeting modification of the liposome can change the biological distribution of the anticancer drugs,reduce or reverse multidrug resistance of tumor cells and enhance the effect of anti-tumor drugs.With these characteristics mentioned above,lipsomes containing oxaliplatin may play an important role in the treatment of colorectal cancer.

Objective To systematically analyze the effect of adjuvant chemotherapy after radical operation in advanced gastric cancer .Methods The related literatures published at home and abroad were retrieved from the electronic databases including CNKI ,PubMed ,Elsevier ,Springer ,Oxford from January 2003 to December 2013 ,then 11 articles of the randomized controlled trial (RCT) of the comparison between the postoperative adjuvant chemotherapy and simple operation were collected .The effect merging and the quantitative systematic evaluation in the aspects of the total survival ,disease free survival and relapse free survival were per-formed with RevMan5 .2 provided by the Cochrane collaboration network .Results 11 articles of RCT were included with 4 points and more by the Jadad scale ,involving 4 433 patients ,among them 2 203 patients with operation plus postoperative chemotherapy and 2 230 patients with surgery alone .The results analysis indicated that the postoperative adjuvant chemotherapy made the pa-tients to obtain the apparent benefit during survival period ,the significant difference had statistical significance .OS :HR= 0 .80 , 95% CI(0 .73 ,0 .88) ,P<0 .01 ;DFS :HR=0 .78 ,95% CI(0 .63 ,0 .97) ,P=0 .02 ;RFS :HR=0 .67 ,95% CI(0 .53 ,0 .85) ,P=0 .001 . Conclusion The postoperative adjuvant chemotherapy can make the patients with radical operation to obtain the apparent benefit during the survival period .The adjuvant chemotherapy of oral capecitabine plus oxaliplatin or oral Tegafur Gimeracil Oteracil Potas-sium after D2 radical operation may be the best scheme at present .

Objective To construct the conditionally replicating adenovirus vector Ad-delE1b55kD-shRNA/Survivin-EGFP that can transfects into HT-29 effectually and selectively and contains shRNA targeting to human Survivin gene.Methods EGFP geoe and shRNA gene were inserted into pAd-delE1b55kD,then pAd-delE1b55kD-shRNA/Survivin-EGFP was obtained.The plasmid and pBHGE3 were cotransfected into HEK-293 cell to obtain the conditionally replicating adenovirus vector Ad-delE1b55kD-shRNA/Survivin-EGFP.Then DNA of the adenovirus vector was extracted and identified.The transfection efficiency of the vector to HT-29 and LO2 was detected.The expression of Survivin mRNA and protein was detected by RT-PCR and Western blot.Results EGFP gene and shRNA gene targeting to human Survivin mRNA were inserted into conditionally replicating adenovirus vector successfully,proven by sequencing.The transfection efficiency to HT-29 of Ad-delE1b55kD-shRNA/Survivin-EGFP was significantly higher than replication defective adenovirus and liposome vector(P

Objective To investigate the effect of RNAi-mediated survivin gene with conditionally replicating adenovirus Ad-de-lE1b55KD-shRNA/survivin-EGFP silencing on propagation and apoptosis of colon carcinoma cell lines HT-29 .Methods Ad-de-lE1b55KD-shRNA/survivin-EGFP was transfected to transplantation tumor on athymic mouse ,replication defective adenovirus and liposome vector which was contained the same shRNA as Ad-delE1b55KD-shRNA/survivin-EGFP were as control one .Then the change of transplantation tumor on athymic mouse was tested ,and TUNEL was used to assay the apoptosis rate of transplantation tumor cells .Results After transfection of Ad-delE1b55KD-shRNA/survivin-EGFP ,the quality of transplantation tumor on athymic mouse were reduced and the apoptosis rate of transplantation tumor cells were higher than replication defective adenovirus and lipo -some vector which was contained the same shRNA (P<0 .05) .Conclusion The effect of Ad-delE1b55KD-shRNA/survivin-EGFP to colon carcinoma cell on propagation and apoptosis were higher than replication defective adenovirus and liposome vector .

Objective To explore the influence of RNAi-mediated hypoxia-inducible factor 1? (HIF-1?) silencing on the growth and metastasis of colon cancer in nude mice.Methods A total of 30 6-week-old female nude mice were randomly divided into normal saline group (NS group),negative plasmid group and RNA interference group after injected with SW480 subcutaneously to form a colon carcinoma.shRNA-HIF-1? vector was constructed and injected (50 ?g/time,once per 2 d,for 7 times) into the tumor mass of nude mice of RNA interference group to induce RNAi.Normal saline or blank vector was injected into the corresponding nude mice.The changes of HIF-1? were detected with RT-PCR and Western blot analysis.The size of tumors,metastasis rate and the positive rate of lymphnode were compared among different groups.Results In 15 d after RNAi vector injection,the tumor volume of RNAi group [(273.9?14.7) mm3] was much smaller than those of NS group [(1 845.5?91.2) mm3] and negative plasmid group [(1 842.7?115.7) mm3] (P

Objective To evaluate the safety and efficacy of laparoscopitotal mesorectal excision (TME) with sphincter-preservation in the treatmenof low rectal cancerby using metanalysi.MethodThe electronidatabase(PubMed ,Medline ,Ov-id ,Cochrane Library ,Controlled TrialRegistry ,SinoMedCBM ,Wanfang Dat,CNKI ,VIP ,eal) were retrieved .The related litera-tureon the randomized controlled trail(RCTs) and the non-randomized controlled trails(non-RCTs) comparing laparoscopiver-sulaparotomy TME with sphincter-preservation fotreating low rectal cancepublished from January 2001 to Octobe2012 were collected .The RevMan5 .2 software waused to conducthe metanalysi.ResultTwelve studieincluding 1 508 patientwere included ,in which the laparoscopigroup had 781 caseand the laparotomy group had 727 case.The metanalysiresultshowed thacompared with the laparotomy group ,the laparoscopiTME(LTME) group with sphincter-preservation had significantly lesestimated blood loss[mean difference(MD)= -67 .13 ,95% confidence interval(CI) (-78 .74 ,-55 .51) ,P＜0 .01] ,longedistal resection margins[MD=0 .15 ,95% CI(0 .01 ,0 .29) ,P= 0 .04] ,earlieintestinal functional recovery [MD= -1 .16 ,95% CI (-1 .32 ,-1 .01) ,P＜0 .01] ,shortehospital stay [MD= -3 .99 ,95% CI (-5 .36 ,-2 .63) ,P＜0 .01) ,lestotal morbidity [oddratio(OR)=0 .40 ,95% CI (0 .25 ,0 .63) ,P＜0 .01] ,anastomotileakage[OR=0 .60 ,95% CI (0 .37 ,0 .96) ,P=0 .03] ,urinary re-tention[OR=0 .40 ,95% CI(0 .18 ,0 .87) ,P=0 .02] and incision infection[OR=0 .26 ,95% CI(0 .11 ,0 .61) ,P=0 .002] .The statis-tically significandifferencewere nofound between the two groupin the numbeof lymph node dissection,length of resected specimen ,postoperative obstruction and the 2-yeaoverall survival rate(P＞0 .05) .Conclusion LTME with sphincter-preservation fotreating low rectal cancehathe advantageof lessurgical traum,rapid postoperative recovery and few complication.Never-theles,iineeded to conducfurtheresearch fovalidating whetheLTME with sphincter-preservation having the superiority in the aspectof postoperative anal function recovery and long-term outcome .

Objective To investigate the effects of VEGF-induced expression of Survivin by colon cancer cells(LOVO,HCT116) and human umbilical vein endothelial cells(HUVECs).Methods VEGF was used to stimulate the LOVO,HCT116,HUVECs.We used RT-PCR and Western blot to estimate the expression of Survivin in different cells,and immunocytochemistry to investigate the expression level and site of Survivin protein.ResultsSurvivin was expressed highly in the cytoplasm and was upregulated with the induction of VEGF.In HUVECs,Survivin expression was not obvious but significantly upregulated with the inductioin of VEGF in the cytoplasm and nucleus.Conclusion The expression of Survivin mRNA and protein are upregulated by VEGF stimulation.The level and distribution of Survivin are different in tumor cell lines and non-tumorgenicity cells.

Objective:To explore the influence of RNAi mediated Slug silencing on the growth and metastasis of colon cancer in nude mice.Methods: HCT116 colon cancer cells use for 24 five-week-old nude mice implanted subcutaneously , established colon cancer xenograft model in nude mice ,all divided into blank control group ,negative control group and the experimental group ,each group had eight nude mices.All group were injected with saline , negative plasmid and lentivirus vectors respectively.Tumor growth was observed and draw tumor curved growth ,changes in tumor growth and lymph node metastasis between the groups were observed ,Slug gene and protein expression were detected by immunohistochemistry ,qRT-PCR and Western blot analysis.Results: Slug gene shRNA intervention group compared with the control group and negative control group ,tumor grew slower ,tumor mass was significantly reduced (3.08±0.31 vs 7.37±1.18,7.46±1.16,P＜0.01),experimental group of lymph node-positive rate was 36.3%( 4 /11 ) ,compared to the negative control group 77.8% ( 14/18 ) and the control group was 68.4% ( 13/19 ) ( P＜0.01 ).Conclusion: Targeted Slug RNA interference can significantly inhibit the growth of colon cancer in nude mice ,lymph node metastasis and the expression of the gene protein in cancer tissue ,Slug may be a potential molecular target for colon cancer gene therapy.