Objective: To investigate the clinical value of laparoscopic peritoneal dialysis catheter implantation in peritoneal chemotherapy for gastric cancer with peritoneal metastasis. Methods: From January 2019 to June 2019, the clinical data of 6 patients diagnosed as gastric cancer with peritoneal metastasis were retrospectively analyzed in the Gastrointestinal Surgery Department of Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine. Five were male and 1 was female. The median age was 69.5 (28-77) years. The median body mass index (BMI) was 22.8 (19.6-23.5). All procedures were performed under general anesthesia with endotracheal intubation. The patient′s body position and facility layout in the operating room were consistent with those of laparoscopic gastrectomy. The operator′s position: the main surgeon was located on the right side of the patient, the first assistant stood on the left side of the patient, and the scopist stood between the patient′s legs. Surgical procedure: (1) trocar location: three abdominal trocars was adopted, with one 12 mm umbilical port for the 30° laparoscope (point A). Location of the other two trocars was dependent on the procedure of exploration or biopsy as well as the two polyester cuff position of the peritoneal dialysis catheter: Usually one 5 mm port in the anterior midline 5 cm inferior to the umbilicus point was selected as point B to ensure that the distal end of the catheter could reach the Douglas pouch. The other 5 mm port was located in the right lower quadrant lateral to the umbilicus to establish the subcutaneous tunnel tract, and the proximal cuff was situated 2 cm away from the desired exit site (point C).(2) exploration of the abdominal cavity: a 30° laparoscope was inserted from 12 mm trocar below the umbilicus to explore the entire peritoneal cavity. The uterus and adnexa should be explored additionally for women. Once peritoneal metastasis was investigated and identified, primary laparoscopic peritoneal dialysis catheter implantation was performed so as to facilitate subsequent peritoneal chemotherapy. Ascites were collected for cytology in patients with ascites. (3) peritoneal dialysis catheter placement: the peritoneal dialysis catheter was introduced into the abdominal cavity from point A. Under the direct vision of laparoscopy, 2-0 absorbable ligature was reserved at the expected fixation point of the proximal cuff (point B) for the final knot closure. Non-traumatic graspers were used to pull the distal cuff of peritoneal dialysis catheter out of the abdominal cavity through point B. The 5-mm trocar was removed simultaneously, and the distal cuff was fixed between bilateral rectus sheaths at the anterior midline port site preperitoneally. To prevent subsequent ascites and chemotherapy fluid extravasation, the reserved crocheted wire was knotted. From point C the subcutaneous tunnel tract was created before the peritoneal steath towards the port site lateral to the umbilicus. Satisfactory catheter irrigation and outflow were then confirmed. Chemotherapy regimen after peritoneal dialysis catheterization: all patients began intraperitoneal chemotherapy on the second day after surgery. On the 1st and 8th day of each 3-weeks cycle, paclitaxel (20 mg/m²) was administered through peritoneal dialysis catheter, and paclitaxel (50 mg/m²) was injected intravenously. Meanwhile, S-1 was orally administered twice daily at a dose of 80 mg·m^-2·d^-1 for 14 consecutive days followed by 7-days rest. To observe the patients′ intraoperative and postoperative conditions. Results: All the procedures were performed successfully without intraoperative complications or conversion to laparotomy. No 30 day postoperative complications were observed. The median operative time was 33.5 (23-38) min. The median time to first flatus was 1(1-2) days, and the median postoperative hospital stay was 3 (3-4) days, without short-term complications within 30 days postoperatively. The last follow-up was up to July 10, 2019, and the patients were followed for 4(1-6) months. No ascites extravasation was observed and no death occurred in the 6 patients. There was no catheter obstruction or peritoneal fluid extravasation during and after chemotherapy. Conclusion Laparoscopic peritoneal dialysis catheter implantation was safe and feasible for patients with peritoneal metastasis of gastric cancer. The abdominal exploration, tumor staging and the abdominal chemotherapy device implantation can be completed simultaneously, which could simplify the surgical approach, improve the quality of life for patients and further propose a new direction for the development of abdominal chemotherapy.

Objective To investigate the application value of the modified Overlap esophagojejunostomy in totally laparoscopic total gastrectomy (TLTG).Methods The retrospective cross-sectional study was conducted.The clinicopathological data of 32 patients who underwent TLTG with modified Overlap esophagojejunostomy in the Ruijin Hospital of Shanghai Jiaotong University School of Medicine between January 2015 and December 2017 were collected.The main points of the modified Overlap method:surgeons stood on the right of patients when digestive tract reconstruction,suspension of left half liver and clockwise rotation before esophageal transection were performed,regulating esophageal opening position and building jejunal loop,and then closing openings using 45.0 mm Endo-GIA and barbed wire.Patients who were diagnosed as Ⅰ A stage by postoperative pathological examination were followed up;patients with lymph node metastases underwent chemotherapy of XELOX regimen and patients in Ⅰ B and Ⅱ stages without lymph node metastases underwent oral S-1 single agent.Observation indicators:(1) surgical and postoperative recovery situations;(2) follow-up and survival situations.Follow-up using outpatient examination and telephone interview was performed to detect postoperative adjuvant therapy,long-term complications and survival up to March 2018.Measurement data with normal distribution were represented as x±s,and measurement data with skewed distribution were described as M(range).Results (1) Surgical and postoperative recovery situations:all the 32 patients underwent successful TLTG and modified Overlap esophagojejunostomy.The operation time,esophagojejunostomy time,volume of intraoperative blood loss,time to initial anal exsufflation,time for initial fluid diet intake,time for initial semifluid diet intake and time of postoperative drainage-tube removal were respectively (227 ± 19) minutes,(22 ±7)minutes,(69±11)mL,(2.1±0.5) days,(3.4±0.4) days,(4.9±0.6) days and (7.5±1.7) days.There was no anastomotic stoma-related complication in 32 patients.One patient was complicated with duodenal stump leakage at 5 days postoperatively and was cured by continuous three-cavity irrigation and conservative treatment.Results of postoperative pathological examination:number of lymph node dissected in 32 patients was 32±4.TNM staging:1,5,7,11,6,1 and 1 patients were detected respectively in Ⅰ A,Ⅰ B,Ⅱ A,Ⅱ B,ⅢA,ⅢB and ⅢC.Duration of postoperative hospital stay of 32 patients was (8.1 ±2.1)days.(2) Follow-up and survival situations:32 patients were followed up for 3-38 months,with a median time of 18 months.During the follow-up,in addition to 1 patient in IA stage,31 patients underwent postoperative adjuvant therapy;patients can take the common soft food,without symptoms of choking and burning feelings,and gastroscopy reexamination was performed at 6 months postoperatively and showed anastomosis patency.One patient died of malignant tumor of maxillary sinus at 9 months postoperatively,1 was detected liver metastasis at 20 months postopeartively and survived with tumor,the other patients had no tumor recurrence or metastasis.Conlusion The modified Overlap esophagojejunostomy is safe and feasible in TLTG,with good short-term outcomes.

Objective: To modify traditional prognostic model for patients with ER/PR+, HER2- breast cancer to meet the actual requirements in current clinical practice. Methods: 335 patients with ER/PR+, HER2- breast cancer, who were admitted in Department of Breast Surgery, Shanghai Huangpu Center Hospital from January 2009 to December 2009, were enrolled in this study. 97 variables were incorporated into the model, using SCAD variable selection method, after fully considering whether covariates existing a log-linear relationship, reasonable determination of the cut-off value of the covariates in non-logarithmic linear relationship (piecewise linear relationship) and collinear and interaction, then we set up a new Cox regression prognostic model for traditional ER/PR+, HER2-type breast cancer patients with traditional immunohistochemical indicators, and further establish its nomogram model. On this basis, a nomogram of the survival probability of 1-, 3-, and 5- years after surgery was established; The discrimination and calibration of model were compared to evaluate the predictive ability of the model. Results: The Cox regression model shows that the prognosis of patients are associated with the histologic grade, lymph node metastasis, Ki67, PR and age etc. Among them, the histologic grade and lymph node metastasis have log-linear relationship with prognosis; Ki67, PR and age have non-log-linear relationship with prognosis and the reasonable cut-off values are Ki67(60%)，PR（20%）and age（55 years old） . Area under the receiver operating characteristic (ROC) curve（AUC）of this Cox model for 1-, 3- and 5- year survival after surgery are all above 0.85, indicating high discrimination. The Grønnesby-Borgan goodness-of-fit test statistics of this model is 1.37 with P>0.05, indicating good calibration. Conclusion: The modified nomogram.could accurately, directly and effectively predict the survival probability of patients, which may exert good guidance for the clinical practice for patients with breast cancer.

Objective:To investigate the application value of three-dimensional (3D) laparoscope in the transanal total mesorectal excision (TaTME).Methods:The retrospective cohort study was conducted. The clinicopathological data of 20 patients with middle and low rectal cancer who underwent TaTME in the Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine from June 2018 to October 2019 were collected. There were 15 males and 5 females, aged from 28 to 81 years, with a median age of 64 years. Of the 20 patients, 10 patients using 3D laparoscopic system for transanal approach of TaTME were divided into 3D group, and 10 patients using two-dimensional (2D) laparoscopic system for transanal approach of TaTME were divided into 2D group. Observation indicators: (1) intraoperative situations and postoperative recovery; (2) postoperative pathological examination; (3) follow-up. Follow-up was conducted by outpatient examination and telephone interview to detect survival of patients and recurrence and metastasis of tumors in patients up to April 2020. Measurement data with skewed distribution were represented as M (range), and comparison between groups was analyzed using the Mann-Whitney U test. Count data were described as absolute numbers, and comparison between groups was analyzed using the Fisher exact propability. Comparison of ordinal data was analyzed using the Mann-Whitney U test. Results:(1) Intraoperative situations and postoperative recovery: patients in the two groups completed surgeries successfully, without tranversion to laparostomy from laparoscopic surgery, transversion to transabdominal surgery from transanal surgery, or intraoperative death. The cases with terminal ileostomy, cases with manual anstomosis or mechanical anastomosis (anastomotic methods), operation time, volume of intra-operative blood loss, duration of postoperative hospital stay, cases with anastomotic leakage or anastomotic hemorrahge (postoperative short-term complications), cases with anastomotic stenosis of the 3D group were 7, 4, 6, 150 minutes (range, 100-220 minutes), 50 mL (range, 30-100 mL), 8.5 days (range, 7.0-16.0 days), 2, 0, 1, respectively, versus 8, 5, 5, 180 minutes (range, 120-250 minutes), 100 mL (range, 30-200 mL), 9.5 days (range, 6.0-17.0 days), 1, 1, 1 of the 2D group. There was no significant difference in the terminal ileostomy, anastomotic methods, postoperative short-term complications, or anastomotic stenosis between the two groups ( P>0.05). There was no significant difference in the operation time, volume of intraoperative blood loss, or duration of postoperative hospital stay between the two groups ( Z=1.909, 1.827, 0.687, P>0.05). Patients with short-term complications in the two groups were improved after conservative treatments. There was 1 patient with anastomotic stenosis in either group, and they were improved after endoscopic balloon dilatation. (2) Postoperative pathological examination: the maximum tumor diameter, distal margin of the tumor, the number of lymph nodes harvested, cases with cancer nodes in the mesentery, cases with complete mesentery or median complete mesentery (the integrity of mesentery), cases in stage Ⅰ, Ⅱ, Ⅲ (postoperative pathological stage) of the 3D group were 3.8 cm (range, 1.8-5.0 cm), 1.0 cm (range, 0.5-2.5 cm), 14.5 (range, 6.0-19.0), 1, 9, 1, 4, 2, 4, respectively, versus 4.8 cm (range, 1.0-8.5 cm), 0.8 cm (range, 0.3-1.5 cm), 15.5 (range, 8.0-18.0), 1, 8, 2, 2, 4, 4 of the 2D group. There was no significant difference in the maximum tumor diameter, distal margin of the tumor, the number of lymph nodes harvested, the integrity of mesentery, or postoperative pathological stage between the two groups ( Z=1.673, 1.772, 0.038, 0.610, 0.482, P>0.05). There was no significant difference in the cases with cancer nodes in the mesentery between the two groups ( P>0.05). Patients in the two groups had negative distal margin and circumferential margin. (3) Follow-up: patients in the 3D group and 2D group were followed up for 11 months (range, 6-16 months) and 13 months (range, 6-21 months), respectively. During the follow-up, there was no local recurrence, distal metastasis, or tumor-related death. Conclusions:3D laparoscope applied in the TaTME can achieve similar clinical efficacy with 2D laparoscope, which may have a positive impact on the operation time and volume of intraoperative blood loss.

Objective:To primarily investigate the application value of glasses-free three-dimensional (3D) laparoscopy system in laparoscopic radical resection of gastrointestinal malignant tumors.Methods:The retrospective cohort study was conducted. The clinical data of 165 patients with gastrointestinal malignant tumors who were admitted to the Ruijin Hospital of Shanghai Jiaotong University School of Medicine between October 2018 and May 2019 were collected. There were 99 males and 66 females, aged from 28 to 86 years, with a median age of 63 years. There were 68 of 165 patients with gastric cancer and 97 with colorectal cancer. Sixteen patients with gastric cancer who underwent laparoscopic radical gastrectomy using the glasses-free 3D laparoscopy system were divided into glasses-free 3D gastric cancer group, and 52 patients with gastric cancer who underwent laparoscopic radical gastrectomy using the polarized glasses 3D laparoscopy system were divided into polarized glasses 3D gastric cancer group. Nineteen patients with colorectal cancer who underwent laparoscopic radical colectomy or proctectomy using the glasses-free 3D laparoscopy system were divided into glasses-free 3D colorectal cancer group, and 78 patients with colorectal cancer who underwent laparoscopic radical colectomy or proctectomy using the polarized glasses 3D laparoscopy system were divided into polarized glasses 3D colorectal cancer group. Observation indicators: (1) operative situations of patients with gastric cancer; (2) postoperative recovery of patients with gastric cancer; (3) postoperative pathological examination results of patients with gastric cancer; (4) operative situations of patients with colorectal cancer; (5) postoperative recovery of patients with colorectal cancer; (6) postoperative pathological examination results of patients with colorectal cancer; (7) follow-up. Follow-up was conducted by outpatient examination or telephone interview to detect complications and survival of patients up to the postoperative 30th day. Measurement data with skewed distribution were represented as M ( P25, P75) or M (range), and comparison between groups was analyzed by the Mann-Whitney U test. Count data were represented as absolute numbers or percentages, and comparison between groups was analyzed using the chi-square test or Fisher exact probability. Results:(1) Operative situations of patients with gastric cancer: all the 68 gastric cancer patients received successfully laparoscopic radical gastrectomy, without intraoperative complication or conversion to laparotomy. Cases with distal gastrectomy or total gastrectomy(surgical methods) , operation time, volume of intraoperative blood loss were 11, 5, 195 minutes(169 minutes, 214 minutes), 20 mL (10 mL, 90 mL) in patients of the glasses-free 3D gastric cancer group, and 31, 21, 196 minutes(173 minutes, 222 minutes), 40 mL(20 mL, 100 mL) in patients of the polarized glasses 3D gastric cancer group, with no significant difference between the two groups ( χ2=0.432, Z=-0.362, -1.065, P>0.05). (2) Postoperative recovery of patients with gastric cancer: the time to first flatus, time to initial semi-fluid diet intake, duration of postoperative hospital stay were 2 days(2 days, 3 days), 6 days(5 days, 7 days), 10 days(9 days, 14 days) in patients of the glasses-free 3D gastric cancer group, and 2 days(2 days, 3 days), 6 days(5 days, 6 days), 11 days(9 days, 14 days) in patients of the polarized glasses 3D gastric cancer group, with no significant difference between the two groups ( Z=-0.163, -1.870, -0.570, P>0.05). The postoperative complication incidence of the glasses-free 3D gastric cancer group was 12.5%(2/16), including 1 case with duodenal stump fistula, 1 case with anastomotic bleeding. The postoperative complication incidence of the polarized glasses 3D gastric cancer group was 17.3%(9/52), including 2 cases with duodenal stump fistula, 2 cases with delayed gastric emptying, 1 case with pulmonary infection, 1 case with abdominal bleeding, 1 case with anastomotic leakage, 1 case with chylous fistula, 1 case with intestinal obstruction. All the patients with complications were cured after symptomatic supportive treatment. There was no significant difference in the complication incidence between the two groups ( χ2=0.209, P>0.05). (3) Postoperative pathological examination results of patients with gastric cancer: the tumor diameter, cases in stage T1, T2, T3, T4 (tumor T staging), cases with vascular invasion, cases with nerve invasion, cases with tumor nodule, cases in stage N0, N1, N2, N3 (tumor N staging), the number of positive lymph node, the number of lymph node dissected, cases with qualified lymph node dissected, cases in stage Ⅰ, Ⅱ, Ⅲ, Ⅳ (TNM clinical staging) were 3.0 cm(2.0 cm, 5.0 cm), 5, 3, 1, 7, 8, 5, 2, 3, 2, 4, 7, 6(1, 15), 28(22, 43), 15, 4, 3, 9, 0 in patients of the glasses-free 3D gastric cancer group, and 3.5 cm(2.0 cm, 6.0 cm), 13, 10, 4, 25, 19, 23, 2, 26, 6, 7, 13, 1(0, 7), 29(21, 39), 43, 21, 10, 20, 1 in patients of the polarized glasses 3D gastric cancer group. There was no significant difference in the tumor diameter, tumor T staging, cases with vascular invasion, cases with nerve invasion, cases with tumor nodule, the number of lymph node dissected, cases with qualified lymph node dissected, TNM clinical staging between the two groups ( Z=-0.570, -0.434, χ2 =0.926, 0.851, 1.655, Z=-0.579, χ2=1.193, Z=-1.134, P>0.05). There were significant differences in the tumor N staging and the number of positive lymph node between the two groups ( Z=-2.167, -2.283, P<0.05). (4) Operative situations of patients with colorectal cancer: all the 97 colorectal cancer patients received successfully laparoscopic radical colectomy or proctectomy, without intraoperative complications or conversion to laparotomy. Cases with radical colectomy or proctectomy (surgical methods), operation time, volume of intraoperative blood loss were 7, 12, 132 minutes(97 minutes, 156 minutes), 20 mL(10 mL, 50 mL) in patients of the glasses-free 3D colorectal cancer group, and 40, 38, 124 minutes(110 minutes, 159 minutes), 25 mL(15 mL, 65 mL) in patients of the polarized glasses 3D colorectal cancer group, with no significant difference between the two groups ( χ2 =1.276, Z=-0.141, -0.863, P>0.05). (5) Postoperative recovery of patients with colorectal cancer: the time to first flatus, time to initial semi-fluid diet intake, duration of postoperative hospital stay were 2 days(1 days, 3 days), 5 days(5 days, 6 days), 8 days(7 days, 10 days) in patients of the glasses-free 3D colorectal cancer group, and 2 days(1 days, 3 days), 5 days(4 days, 6 days), 8 days(6 days, 10 days) in patients of the polarized glasses 3D colorectal cancer group, with no significant difference between the two groups ( Z=-0.678, -1.751, -1.674, P>0.05). The complication incidence of the glasses-free 3D colorectal cancer group was 15.8%(3/19), including 1 case with anastomotic leakage after low anterior proctectomy, 1 case with incision infection, 1 case with urinary tract infection. The complication incidence of the polarized glasses 3D colorectal cancer group was 14.1%(11/78), including 3 cases with anastomotic leakage after low anterior proctectomy, 2 cases with intestinal obstruction, 2 cases with urinary tract infection, 2 cases with incision infection, 1 case with anastomotic bleeding, 1 case with pulmonary infection. One of the 3 cases with anastomotic leakage after low anterior proctectomy in the polarized glasses 3D colorectal cancer group was cured after remedial terminal ileostomy. The other patients with complications were cured after symptomatic supportive treatment. There was no significant difference in the complication incidence between the two groups ( χ2=0.035, P>0.05). (6) Postoperative pathological examination results of patients with colorectal cancer: the tumor diameter, cases in stage T1, T2, T3, T4 (tumor T staging), cases with vascular invasion, cases with nerve invasion, cases with tumor nodule, cases in stage N0, N1-N2 (tumor N staging), the number of positive lymph node, the number of lymph node dissected, cases with qualified lymph node dissected, cases in stage Ⅰ, Ⅱ, Ⅲ, Ⅳ (TNM clinical staging) were 5.0 cm(3.0 cm, 6.0 cm), 3, 2, 7, 7, 3, 2, 1, 8, 11, 0(0, 4), 17(14, 23), 18, 2, 3, 12, 2 in patients of the glasses-free 3D colorectal cancer group, and 4.0 cm(3.0 cm, 5.0 cm), 7, 16, 43, 12, 14, 12, 7, 46, 32, 0(0, 1), 16(13, 19), 74, 14, 17, 40, 7 in patients of the polarized glasses 3D colorectal cancer group, with no significant difference between the two groups ( Z=-0.768, -1.135, χ2 =0.049, 0.292, 0.278, 1.762, Z=-0.694, -1.349, χ2=0.001, Z=-1.011, P>0.05). (7) Follow-up: 165 patients received follow-up, with out short-term reoperation or postoperative death in the postoperative 30 days. Conclusion:There is no significant difference in the efficacy between glasses-free 3D laparoscopic surgery and polarized glasses 3D laparoscopic surgery for radical resection of gastrointestinal malignant tumors, of which the clinical value requires further study.

Objective To investigate the clinical value of laparoscopic peritoneal dialysis catheter implantation in peritoneal chemotherapy for gastric cancer with peritoneal metastasis. Methods From January 2019 to June 2019, the clinical data of 6 patients diagnosed as gastric cancer with peritoneal metastasis were retrospectively analyzed in the Gastrointestinal Surgery Department of Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine. Five were male and 1 was female. The median age was 69.5 (28?77) years. The median body mass index (BMI) was 22.8 (19.6?23.5). All procedures were performed under general anesthesia with endotracheal intubation. The patient′s body position and facility layout in the operating room were consistent with those of laparoscopic gastrectomy. The operator′s position: the main surgeon was located on the right side of the patient, the first assistant stood on the left side of the patient, and the scopist stood between the patient′s legs. Surgical procedure: (1) trocar location: three abdominal trocars was adopted, with one 12 mm umbilical port for the 30°laparoscope (point A). Location of the other two trocars was dependent on the procedure of exploration or biopsy as well as the two polyester cuff position of the peritoneal dialysis catheter: Usually one 5 mm port in the anterior midline 5 cm inferior to the umbilicus point was selected as point B to ensure that the distal end of the catheter could reach the Douglas pouch. The other 5 mm port was located in the right lower quadrant lateral to the umbilicus to establish the subcutaneous tunnel tract, and the proximal cuff was situated 2 cm away from the desired exit site (point C).(2) exploration of the abdominal cavity: a 30°laparoscope was inserted from 12 mm trocar below the umbilicus to explore the entire peritoneal cavity. The uterus and adnexa should be explored additionally for women. Once peritoneal metastasis was investigated and identified, primary laparoscopic peritoneal dialysis catheter implantation was performed so as to facilitate subsequent peritoneal chemotherapy. Ascites were collected for cytology in patients with ascites. (3) peritoneal dialysis catheter placement: the peritoneal dialysis catheter was introduced into the abdominal cavity from point A. Under the direct vision of laparoscopy, 2?0 absorbable ligature was reserved at the expected fixation point of the proximal cuff (point B) for the final knot closure. Non?traumatic graspers were used to pull the distal cuff of peritoneal dialysis catheter out of the abdominal cavity through point B. The 5?mm trocar was removed simultaneously, and the distal cuff was fixed between bilateral rectus sheaths at the anterior midline port site preperitoneally. To prevent subsequent ascites and chemotherapy fluid extravasation, the reserved crocheted wire was knotted. From point C the subcutaneous tunnel tract was created before the peritoneal steath towards the port site lateral to the umbilicus. Satisfactory catheter irrigation and outflow were then confirmed. Chemotherapy regimen after peritoneal dialysis catheterization: all patients began intraperitoneal chemotherapy on the second day after surgery. On the 1st and 8th day of each 3?weeks cycle, paclitaxel (20 mg/m2) was administered through peritoneal dialysis catheter, and paclitaxel (50 mg/m2) was injected intravenously. Meanwhile, S?1 was orally administered twice daily at a dose of 80 mg·m-2·d-1 for 14 consecutive days followed by 7?days rest. To observe the patients′ intraoperative and postoperative conditions. Results All the procedures were performed successfully without intraoperative complications or conversion to laparotomy. No 30 day postoperative complications were observed. The median operative time was 33.5 (23?38) min. The median time to first flatus was 1(1?2) days, and the median postoperative hospital stay was 3 (3?4) days, without short?term complications within 30 days postoperatively. The last follow?up was up to July 10, 2019, and the patients were followed for 4(1?6) months. No ascites extravasation was observed and no death occurred in the 6 patients. There was no catheter obstruction or peritoneal fluid extravasation during and after chemotherapy. Conclusion Laparoscopic peritoneal dialysis catheter implantation was safe and feasible for patients with peritoneal metastasis of gastric cancer. The abdominal exploration, tumor staging and the abdominal chemotherapy device implantation can be completed simultaneously, which could simplify the surgical approach, improve the quality of life for patients and further propose a new direction for the development of abdominal chemotherapy.

Objective:To investigate the clinical efficacy of gastrojejunal bypass surgery combined with radical gastrectomy following conversion therapy for gastric cancer with outlet obstruction.Methods:The retrospective and descriptive study was conducted. The clinicopatho-logical data of 10 initially unresectable gastric cancer patients with outlet obstruction who were admitted to Ruijin Hospital of Shanghai Jiao Tong University School of Medicine from October 2019 to July 2020 were collected. There were 8 males and 2 females, aged from 41 to 59 years, with a median age of 53 years. Patients underwent 'sandwich therapy' of gastrojejunal bypass surgery combined with gastrectomy following conversion therapy. Observation indicators: (1) gastrojejunal bypass surgery and postoperative situations; (2) conversion therapy and complications; (3) radical gastrectomy and postoperative situations; (4) follow-up. Follow-up using outpatient examinations or telephone interview was conducted to detect postoperative complications, progress-free survival, tumor recurrence and metastasis up to March 2019. Measurement data with normal distribution were represented as Mean± SD, and measurement data with skewed distribution were represented as M(range). Count data were described as absolute numbers. Results:(1) Gastrojejunal bypass surgery and postoperative situations: 10 patients received modified gastrojejunal bypass surgery combined with No.4sb lymph node dissection, without intraoperative serious complications, conversion to laparotomy or death. The operation time, volume of intraoperative blood loss, time to postoperative first flatus, time to liquid diet intake were 73 minutes(range, 60-87 minutes), 33 mL(range,20-110 mL), 3 days(range, 2-6 days), 4 days(range, 4-9 days). One patient had post-operative Clavien-Dindo grade Ⅱ complication of anastomotic bleeding, and was improved after transfusion of blood products. (2) Conversion therapy and complications: of 10 patients, 9 cases received 4 cycles of FLOT regimen. One of the 9 cases was suspended chemotherapy due to Clavien-Dindo grade Ⅱ anastomotic edema after 2 cycles of FLOT regimen. Of 10 patients, there were 6 cases with partial response and 4 cases with stable disease. Of 6 patients with partial response, 4 cases with preoperative cT4b stage were down stage to T4a stage, showing the relationship of tumor with transverse mesentery and pancreatic capsule clearer than the first exploration, 2 cases with preoperative lymph nodes fusion had shrank obviously. Of 4 patients with stable disease, 3 cases were negative for lymph nodes shranking, and the rest 1 case with tumor peritoneal metastasis diagnosed by initial laparoscopy can not be evaluated by imaging examination after chemotherapy. Two of 10 patients had Clavien-Dindo grade I complication of elevated blood glucose during the chemotherapy, which were improved after insulin therapy. (3) Radical gastrectomy and post-operative situations: 10 patients underwent radical resection after conversion therapy. Of 4 cases with stable disease, 3 cases with preoperative lymph nodes fusion showed obvious space between lymph nodes and surrounding tissues at resurgical exploration and received radical resection, 1 case with peritoneal metastasis showed abdominal wall nodelus and omental tuberosity as fibrous scars at resurgical exploration and received radical resection. The operation time, volume of intra-operative blood loss, time to postoperative first flatus, time to initial liquid diet intake, duration of total hospital stay, duration of postoperative hospital stay of 10 patients were 148 minutes(range, 95-195 minutes), 108 mL(range, 100-180 mL), 3 days(range, 2-7 days), 4 days(range, 3-9 days), 11 days(range, 10-21 days), 8 days(range, 7-16 days). Two of 10 patients had perioperative complications. Results of pathological examination of 10 patients showed the number of dissected lymph nodes as 25±6. There were 1 case of stage T1, 5 cases of stage T3, 4 cases of stage T4a. There were 1 case of stage N0, 2 cases of stage N1, 3 cases of stage N2, 4 cases of stage N3. There were 3 cases of tumor regression grade 1a, 1 case of grade 1b, 4 cases of grade 2, 2 cases of grade 3. (4) Follow-up: 10 patients were followed up for 3.9-13.0 months, with a median follow-up time of 6.0 months. The median progression-free survival time of 10 patients was 6.0 months. During the follow-up, 1 case underwent postoperative Clavien-Dindo grade Ⅱ complication of delayed gastric emptying and was improved after symptomatic treatment.Conclusion:The gastrojejunal bypass surgery combined with gastrectomy following conversion therapy for gastric cancer with outlet obstruction is safe and effective.

Objective:To analyze and summarize the implementation effect of basic essential surgical training (BEST) course of laparoscopic skills over the past 10 years and the practical experience in updating course content and models.Methods:The pre-class assessment questionnaires, basic laparoscopic operation assessment results, and post-class assessment questionnaires of the students who participated in the BEST course of laparoscopic skills were collected. According to the period of the course construction, the students were divided into two groups, namely students who used the course of single training system in the early stage (traditional group) and students who used the course integrating a variety of training systems after the course model was updated in the later stage (test group). The two groups were compared for the scores of track circle moving, tunnel crossing, and high and low columns, as well as their subjective evaluation of course setting and implementation effect. The t-test, Wilcoxon test, or chi-square test was conducted according to the data type using SPSS 13.0. Results:The time for 150 traditional group students to complete track circle moving, tunnel crossing, and high and low columns was 1.08 min (0.81 min, 1.60 min), 2.20 min (1.60 min, 3.27 min), and 4.86 min (3.28 min, 6.36 min), respectively, while the time for 75 test group students to complete the three operations was 1.27 min (0.87 min, 1.83 min), 2.57 min (1.58 min, 4.07 min), and 4.35 min (2.90 min, 6.42 min), respectively, with no significant difference between the two groups ( P>0.05). In terms of students' subjective evaluation of the course, a higher percentage of the test group students were satisfied with classroom environment, teaching method arrangement, training equipment, training opportunities, helping clinical work, and meeting pre-class expectations than those in the traditional group. Conclusion:The constantly updated BEST course can ensure the training quality of trainees and obtain their higher satisfaction. The benefits of this course in clinical practice can be further verified through long-term follow-up of these trainees.

Objective To investigate the clinical value of laparoscopic peritoneal dialysis catheter implantation in peritoneal chemotherapy for gastric cancer with peritoneal metastasis. Methods From January 2019 to June 2019, the clinical data of 6 patients diagnosed as gastric cancer with peritoneal metastasis were retrospectively analyzed in the Gastrointestinal Surgery Department of Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine. Five were male and 1 was female. The median age was 69.5 (28?77) years. The median body mass index (BMI) was 22.8 (19.6?23.5). All procedures were performed under general anesthesia with endotracheal intubation. The patient′s body position and facility layout in the operating room were consistent with those of laparoscopic gastrectomy. The operator′s position: the main surgeon was located on the right side of the patient, the first assistant stood on the left side of the patient, and the scopist stood between the patient′s legs. Surgical procedure: (1) trocar location: three abdominal trocars was adopted, with one 12 mm umbilical port for the 30°laparoscope (point A). Location of the other two trocars was dependent on the procedure of exploration or biopsy as well as the two polyester cuff position of the peritoneal dialysis catheter: Usually one 5 mm port in the anterior midline 5 cm inferior to the umbilicus point was selected as point B to ensure that the distal end of the catheter could reach the Douglas pouch. The other 5 mm port was located in the right lower quadrant lateral to the umbilicus to establish the subcutaneous tunnel tract, and the proximal cuff was situated 2 cm away from the desired exit site (point C).(2) exploration of the abdominal cavity: a 30°laparoscope was inserted from 12 mm trocar below the umbilicus to explore the entire peritoneal cavity. The uterus and adnexa should be explored additionally for women. Once peritoneal metastasis was investigated and identified, primary laparoscopic peritoneal dialysis catheter implantation was performed so as to facilitate subsequent peritoneal chemotherapy. Ascites were collected for cytology in patients with ascites. (3) peritoneal dialysis catheter placement: the peritoneal dialysis catheter was introduced into the abdominal cavity from point A. Under the direct vision of laparoscopy, 2?0 absorbable ligature was reserved at the expected fixation point of the proximal cuff (point B) for the final knot closure. Non?traumatic graspers were used to pull the distal cuff of peritoneal dialysis catheter out of the abdominal cavity through point B. The 5?mm trocar was removed simultaneously, and the distal cuff was fixed between bilateral rectus sheaths at the anterior midline port site preperitoneally. To prevent subsequent ascites and chemotherapy fluid extravasation, the reserved crocheted wire was knotted. From point C the subcutaneous tunnel tract was created before the peritoneal steath towards the port site lateral to the umbilicus. Satisfactory catheter irrigation and outflow were then confirmed. Chemotherapy regimen after peritoneal dialysis catheterization: all patients began intraperitoneal chemotherapy on the second day after surgery. On the 1st and 8th day of each 3?weeks cycle, paclitaxel (20 mg/m2) was administered through peritoneal dialysis catheter, and paclitaxel (50 mg/m2) was injected intravenously. Meanwhile, S?1 was orally administered twice daily at a dose of 80 mg·m-2·d-1 for 14 consecutive days followed by 7?days rest. To observe the patients′ intraoperative and postoperative conditions. Results All the procedures were performed successfully without intraoperative complications or conversion to laparotomy. No 30 day postoperative complications were observed. The median operative time was 33.5 (23?38) min. The median time to first flatus was 1(1?2) days, and the median postoperative hospital stay was 3 (3?4) days, without short?term complications within 30 days postoperatively. The last follow?up was up to July 10, 2019, and the patients were followed for 4(1?6) months. No ascites extravasation was observed and no death occurred in the 6 patients. There was no catheter obstruction or peritoneal fluid extravasation during and after chemotherapy. Conclusion Laparoscopic peritoneal dialysis catheter implantation was safe and feasible for patients with peritoneal metastasis of gastric cancer. The abdominal exploration, tumor staging and the abdominal chemotherapy device implantation can be completed simultaneously, which could simplify the surgical approach, improve the quality of life for patients and further propose a new direction for the development of abdominal chemotherapy.