Objective: By hybrid technology,to study the biological characteristics and antitumor function of gastric cancer-dendritic fusion cells through the fusion of dendritic cells from cord blood with gastric cancer cells SGC7901,Method: DCs from cord blood were fused with SGC7901 in the presence of 50% polyethylene glycol.The morphology and phenotype of DCs,SGC7901 and DCs/SGC7901 were respectively observed by SP immunocytechemical staining.The ability of DCs/SGC7901 which stimulated proliferation of autologous T lymphocytes was assessed by MTT,and the kill rate of cytotoxic T lymphocytes(CTL) to SGC7901 induced by FCs(fusion cells) was evaluated through cytotoxic test.Result: DCs were successfully fused with SGC7901 in the presence of PEG,FCs expressed CEA and HLA-DR two phenotypes.Moreover,fusion cells had greater ability to stimulate proliferation of T lymphocytes than DCs?DCs+SGC7901,SGC7901,and the kill rate of FCs(21.4%?0.0165%) was greatty high than that of DCs(16.3%?0.0015%),DCs+SGC7901(15.3%?0.0044%),SGC7901(11.2%?0.0156%).Conclusion: DCs from cord blood can be successfully fused with SGC7901 in the presence of PEG,and FCs can effectively stimulate T lymphocytes to elicit antitumor immunity effect.

Objective To understand the screening results and positive lesion situation of colonoscopy screening among high risk urban population of colon cancer in Chongqing Nan'an District to provide a basis for the community heath guidance.Methods The high risk subjects of colon cancer screened according to the item of the Early Diagnosis and Early Treatment of China Urban Cancer and in our center for completing colonoscopy screening during 2013-2016 were collected and analyzed on the positive rates of various lesions.Results A total of 435 subjects were included,141 positive cases were found with the total positive rate of 32.41％ (141/435),in which 75 cases were male positive with the positive rate of 47.47％ (75/158),and 66 cases were female positive with the positive rate of 23.83 ％ (66/277),the polyps detective rate was 28.27 ％ (123/435),tumor-like lesion detective rate was 7.59％(33/435),the adenocarcinoma detection rate was 0.46％ (2/435);the total positive rate of male was higher than that of female(x2 =25.669,P＜0.01).Conclusion The sequential screening mode in which the high risk population preliminarily screened out by community then performs colonoscopy examination has an important significance for discovering the intestinal tract lesion.

Objective:To establish a model of improving diagnostic capability in infiltration depth of colorectal cancer (CRC) with combining narrow band imaging system(NBI) and endoscopic ultrasonography (EUS).Methods:CRC patients who were treated in Chongqing Fifth People′s Hospital from April 2015 to March 2021 were selected retrospectively as the research objects. All patients were diagnosed by postoperative pathological diagnosis. In the end, a total of 288 CRC patients were included. Using the random number table method, the study subjects were divided into modeling group ( n=192) and verification group ( n=96) at a ratio of 2∶1. The patients′ general information, NBI and EUS examination results were collected; logistic regression was used to analyze the independent risk factors of CRC submucosal infiltration, and a model was built to predict the depth of CRC infiltration; receiver operating characteristic (ROC) was used to identify the diagnostic ability of model. The diagnostic efficacy of CRC submucosal infiltration was verified internally by the verification group. Results:In the modeling group, lymph node metastasis ( OR=6.492, 95% CI: 5.128-7.855, P<0.001), low tumor differentiation ( OR=2.736, 95% CI: 1.731-3.741, P<0.001) and tumor length ( OR=2.049, 95% CI: 1.524-2.574, P<0.001) were independent risk factors for submucosal infiltration in CRC patients; The nomograph model constructed according to the above independent risk factors had a strong diagnostic ability for the depth of submucosal infiltration of CRC, and was internally validated in the validation group. AUC values of the modeling group and the validation group were 0.945 (0.935-0.955) and 0.951 (0.942-0.961), respectively. Conclusions:The nomogram model established by the combination of endoscopic narrow band imaging technology and ultrasound endoscopy can diagnose the depth of CRC infiltration better.