Objective To evaluate the toxicity and efficacy of post-operative chemoradiotherapy for gastric cancer. Methods Forty-five gastric cancer patients treated with post-operative radiation ± concurrent chemotherapy were retrospectively analyzed. Among them, 14 were female and 31 were male. The median age was 54 (30-72) years. Pathology stages were IB-IV. Radiotherapy of doses from 45 Gy/25fx to 55 Gy/30fx was delivered to the tumor bed and regional lymph nodes with 3D conformal or IMRT technology.Concurrent chemotherapy agent was fluorouracil or capacitabine. Results All patients except 2 (4%)completed radiotherapy as planned. The most common acute toxicities were hematologic and gastrointestinal effects. The incidence of the patients was 56% with mild nausea/vomiting,71% and 7% with grade Ⅰ / Ⅱ and Ⅲ leucopenia, and 38% with grade Ⅰ/Ⅱ hypodynamia and anepithymia. The 1-year overall survival,relapse-free survival and local control rates were 87% ,82% and 95%, respectively. Conclusions Postoperative chemoradiation for patients with locally advanced gastric cancer is tolerable. Our study shows the advantage of post-operative chemoradiation for local control. However,further prospective randomized trial is needed to validate the efficacy.

Objective To assess the impact of respiratory motion on the displacement of target area and to analyze the discrimination between free breathing and active breathing control (ABC) in patients with gastric cancer treated with post-operative radiotherapy. Methods From January 2005 to November 2006, 22 patients with post-operatively confirmed gastric cancer were enrolled in this study. All diseases were T_3/ N +, staging Ⅱ - Ⅳ. Patients were CT scanned and treated by radiation with the use of ABC. Image J software was used in image processing, motion measurement and data analysis. Surgical clips were implanted as fiducial marks in the tumor bed and lymphatic drainage area. The motion range of each clip was measured in the resultant-projection image. Motions of the clips in superior-inferior (S-I), right-left (R-L) and anterior-posterior (A-P) directions were determined from fluoroscopy movies obtained in the treatment position. Results The motion ranges in S-I, R-L and A-P directions were 11.1 mam, 1.9 mm and 2.5 mm (F = 85.15, P = 0. 000) under free breathing, with 2.2 mm, 1.1 mm and 1.7 nun under ABC (F = 17.64, P = 0. 000), and the reduction of motion ranges was significant in both S-I and A-P directions (t = 4.36, P = 0. 000;t = 3.73,P = 0.000). When compared with under free-breathing, the motion ranges under ABC were kept unchanged in the same breathing phase of the same treatment fraction, while significant increased in different breathing phase in all three directions (t = - 4.36, P = 0. 000; t = - 3.52, P = 0.000; t =-3.79, P = 0. 000), with a numerical value of 3.7 mm, 1.6 mm and 2.8 mm, respectively (F = 19.46, P = 0. 000) . With ABC between different treatment fractions , the maximum displacements were 2.7 mm, 1.7 mm and 2.5 mm for the centre of the clip cluster (F =4.07,P =0. 019), and were 4.6 mm, 3.1 mm and 4.2 mm for the clips (F =5.17 ,P =0.007). The motion ranges were significant increased in all the three directions (t = - 4.09, P=0.000 ; t =-4.46, P = 0.000 ; t = - 3.45, P =0.000). Conclusions In the irradiation of post-operative gastric cancer, the maximum displacement of organ motions induced by respiration is in S-1 direction and the minimum in R-L direction under free breathing. The use of ABC can reduce the motions significantly in S-I and A-P directions, and the same changes exist in both inter-and intra-fraction treatment.

Objective To compare the dose distribution of the target and normal tissues in gastric cancers between three-dimension conformal radiation therapy (3DCRT) and intensity modulated radiation therapy (IMRT) plan when respiratory motion factors integrated in the plan. Methods From January 2005to November 2006, 10 patients with post-operatively radiation of gastric cancer were enrolled in this study.Planning CT were acquired conventionally with free-breath mode and the static treatment plans of the 3DCRT and IMRT were designed respectively. Probability distribution functions (PDF) were generated and convoluted with the static dose distributions from 3DCRT and IMRT plans to obtain the integrated plans. The dose distributions of the target and normal tissues were compared between 3DCRT and IMRT integration treatment plans, such as V45 of clinical target volume, V4o of liver and V15, V18 of left and right kidney.Results In the respiratory integrated treatment planning, the target volume coverage and homogeneity with IMRT are superior to those with 3DCRT ( ( V45 98%∶ 87% (t = -3. 35 ,P =0. 010) ,mean dose 46. 81 Gy ±0. 75 Gy∶45.99 Gy ± 1.12 Gy (t = -0. 31 ,P=0. 020) ). The V40 of teh liver in IMRT are smaller than those in 3DCRT ( 12%∶ 16% ;t=3.75,P=0.010). For the left kidney, the V15 and V18 in IMRT are smaller than those in 3DCRT ( (34%∶ 50% (t = 2. 17 ,P = 0. 050) and 27%∶46% (t = 3. 11 ,P = 0. 020) ),but for the right kidney, V15 and V18 in 3DCRT are smaller than those in IMRT ( ( 15%∶ 21% (t = - 2. 42,P=0.040) and 11%∶15% (t= -2.71,P=0.030)). Conclusions When respiratory motion factor integrated in the treatment plan, IMRT showed advantage both in target coverage and normal tissue sparing in the high dose region of liver and left kidney.

Objective To evaluate the safety and efficacy of endoscopic retrograde cholangiopancreatography (ERCP) for the diagnosis and treatment of pancreas divisum(PD) associated with recurrent acute pancreatitis(RAP) in children and teenagers. Methods Data of patients with symptomatic PD associated with RAP under 18 years old who were diagnosed and treated with ERCP from January 2011 to January 2015 were retrospectively analyzed. Patients with complete pancreas divisum underwent endoscopic minor sphincterotomy combined with dorsal duct stenting ( ESCS ) , and those with incomplete pancreas divisum underwent bi?papilla endoscopic sphincterotomy combined with dorsal duct stenting ( Bi?ESCS ) . ERCP?related data, complications were recorded. Long?term follow?up was conducted for procedure related complications. Results Nine patients with symptomatic PD associated with RAP were firstly diagnosed. A total of 18 ERCP procedures were performed in these patients, with success rate of 100. 0% ( 18/18) in the minor papilla cannulation, and mild ERCP?related complication rate of 11. 1% ( 2/18) . One was acute mild pancreatitis and the other was hyperamylasemia. During follow?up from 3 to 60 months, all patients had pain relief, among whom 7 were asymptomatic, with no onset of acute pancreatitis. Dorsal ducts of all patients were not obviously dilated in MRCP or CT scan. All patients gained weight and presented normal physical and intelligence development. Conclusion Symptomatic PD associated with RAP can be completely diagnosed with ERCP . ESCS and Bi?ESCS are safe and effective endoscopic treatment techniques for pediatric cases.

Objective To evaluate the feasibility and safety of performing endoscopic retrograde cholangiopancreatography (ERCP) assisted by single-balloon enteroscopy (SBE) in patients with biliary obstruction after gastrointestinal reconstruction.Methods Clinical data about 7 cases of single-balloon enteroscopy assisted-ERCP (SBE-ERCP) were summarized including the completion of treatment,operation time,and complications for retrospective study.Results The papilla or anastomotic site was reached and therapeutic ERCP were performed successfully in 6 patients.The overall success rate was 85.7％ (6/7),and the mean operation time of SBE-ERCP was 42 min (ranging from 28 to 72 min).The afferent loop and papilla were failed to be confirmed in 1 patient.No complication such as perforation,pancreatitis or bleeding ocurred in all the 7 patients.Conclusion Single-balloon enteroscopy assisted-ERCP (SBE-ERCP) is feasible and relatively safe in postsurgical patients with gastrointestinal reconstruction.

Objective To investigate clinical and pathological characteristics of insulin-induced localized lipoatrophy and treatment.Methods We retrospectively analyzed clinical manifestation, skin biopsy pathology, treatment regimen and follow-up of 6 diabetic patients with insulin-induced localized lipoatrophy in Peking Union Medical College Hospital from January, 2010 to March, 2016, with systemic review of related literatures.Results Among 6 cases with insulin-induced localized lipoatrophy, 5 patients were with insulin allergy.5 patients were with positive insulin-autoimmune antibody, which was similar to the ratio reported in the systematic review (18 out of 19).Insulin-induced lipoatrophy could be caused by various types of preparations of insulin and insulin analogs.Subcutaneous biopsy, performed on the atrophied area, revealed the decrease of the number and volume of adipocytes and tissue fibrosis, probably accompanied with lymphocytes, eosinophils or mast cells infiltration.Lipoatrophy could sometimes be relieved by changing injection sites, types of insulin preparations or drug-delivery way, sometimes by application of systemic/local glucocorticoid or local cromolyn sodium.Conclusions Insulin-induced localized lipoatrophy is a rare adverse reaction of insulin preparations.It might be related to immune response of local tissue and heterogeneous pathological manifestations.The lipoatrophy might be improved by changing injection sites, changing the type of insulin preparations or drug-delivery way, and with possibility to carry out targeted immunosuppressive therapy according to the biopsy pathology in the future.

Objective:To compare the efficacy and safety of endoscopic retrograde cholangiopancreatography (ERCP) assisted with colonoscope and enteroscope in patients with history of Roux-en-Y anastomosis.Methods:A retrospective study was performed on the data of 70 patients who underwent ERCP assisted with standard colonoscope or single balloon enteroscope after Roux-en-Y reconstruction in Hangzhou Hospital Affiliated to Nanjing Medical University from January 2017 to December 2020. Patients were divided into the standard colonoscopy group ( n=43) and the single balloon enteroscopy group ( n=27) according to endoscopy. The success rates of insertion, intubation and ERCP, and incidence of complications were compared. Results:A total of 81 ERCP procedures were performed in 70 patients. The insertion success rates of the standard colonoscopy group and the single balloon enteroscopy group were 91.8% (45/49) and 78.1% (25/32), respectively, showing no significant difference ( χ2=2.04, P=0.153). The success rates of primitive papilla intubation in the two groups were 74.1% (20/27) and 1/6, showing significant difference ( P=0.016). The ERCP success rates of the standard colonoscopy group and the single balloon enteroscopy group were 75.5% (37/49) and 59.4% (19/32), showing no significant difference ( χ2=2.36, P=0.124). The post operative complication incidences of the standard colonoscopy group and the single balloon enteroscopy group were 4.1% (2/49) and 9.4% (3/32), showing no significant difference ( χ2=0.25, P=0.620). Conclusion:ERCP assisted with standard colonoscope and single balloon enteroscope is safe and effective in patients after Roux-en-Y anastomosis. Standard colonoscopic ERCP can become an endoscopy solution for patients with biliary tract disease after Roux-en-Y reconstruction.

Objective:To explore the preventive effects of pancreatic duct stent combined with rectal administration of indomethacin suppository for post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) after difficult bile duct intubation during endoscopic retrograde cholangiopancreatography (ERCP).Methods:From January 2019 to December 2021, patients with biliary and pancreatic diseases undergoing ERCP in Hangzhou Hospital Affiliated to Nanjing Medical University were given 100 mg indomethacin suppository to anal canal 30 minutes before the operation. And those with difficult bile duct intubation during the operation ( n=204) were included in this study. According to the random number table, they were divided into the combination group (implanted with pancreatic duct stent during the operation, n=104) and the indomethacin group (not implanted with stent, n=100). The incidences of hyperamylasemia and PEP were compared between the two groups. Results:The incidences of postoperative hyperamylasemia [21.2% (22/104) VS 34.0% (34/100), χ2=4.22, P=0.040] and PEP [14.4% (15/104) VS 32.0% (32/100), χ2=8.88, P=0.003] in the combination group were significantly lower than those in the indomethacin group. There was no significant difference in the incidence of severe PEP between the two groups [1.0% (1/104) VS 1.0% (1/100), χ2=0.001, P=0.978]. Conclusion:Compared with rectal administration of indomethacin suppository alone, the incidences of hyperamylasemia and PEP after difficult bile duct intubation during ERCP can be further reduced when it is combined with pancreatic duct stent placement.

Objective:To study the influencing factors of postoperative complications in patients with malignant biliary obstruction treated by endoscopic radiofrequency ablation(RFA).Methods:Data of patients with malignant biliary obstruction who underwent endoscopic RFA at the Department of Gastroenterology, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine from January 2010 to June 2021 were retrospectively analyzed. There were 62 males and 48 females, with age (74.1±11.1) years. Based on occurrence of postoperative complications, these patients were divided into the complication group ( n=18) and the control group ( n=92). Univariate and multivariate logistic regression analysis were used to analysis the influencing factors of complications. Results:RFA was successfully performed in 110 patients with malignant biliary obstruction, and the technical success rate was 100.0% (110/110). Postoperative complications occurred in 18 patients (16.4%), including 12 patients with of biliary tract infection (8 patients with acute cholangitis, 4 patients with acute cholecystitis) and 6 patients with acute pancreatitis. All these patients responded well to treatment. The proportion of patients who developed complications having associated diabetes, bile duct stenosis length >2.5 cm, fractional RFA for bile duct stenosis, and single stent drainage were significantly higher than those in the control group (all P<0.05). Multivariate logistic regression analysis showed that the risk of complications after endoscopic RFA was significantly increased in patients with diabetes ( OR=6.967, 95% CI: 1.256-38.658) and fractional RFA of bile duct stenosis ( OR=8.297, 95% CI: 1.526-45.122), while the risk of complications after multiple stents drainage ( OR=0.037, 95% CI: 0.008-0.169) was significantly decreased (all P<0.05). Conclusion:Diabetes and fractional RFA of bile duct stenosis were risk factors for complications after endoscopic RFA of malignant biliary obstruction. Multiple stents drainage was a protective factor. Better clinical attention should be paid to the patients with high risk factors.

To evaluate the safety and clinical effectiveness of endoscopic retrograde cholangiopancreatography (ERCP) with biliary and pancreatic duct stenting combined with enucleation (En) for cystadenoma in pancreatic head, clinical data of patients with cystadenoma in pancreatic head treated by ERCP+En (ERCP+En group, n=11) or En (En group, n=12) at Hangzhou First People's Hospital from January 2020 to January 2023 were retrospectively analyzed. The general information, intraoperative condition, perioperative complications, hospital stay, and follow-up outcomes were compared between the two groups. No noteworthy difference in general information was observed between the two groups ( P>0.05). In the ERCP+En group, ERCP was successfully implanted into the biliary pancreatic duct stent, and hyperamylasemia occurred in 3 cases after ERCP, which improved after conservative treatment. No conversion to laparotomy or blood transfusion occurred during the En operation, and no serious complication occurred after EN operation in the two groups. There was 0 case and 3 cases of grade B/C postoperative pancreatic fistula in the ERCP+En group and the En group, respectively ( P=0.001). The median hospital stay was 11 days and 15 days, respectively, with statistical significance ( U=2.25, P=0.031). No noteworthy difference in median En time (145 min VS 155 min, U=0.03, P=0.952) or intraoperative blood loss (100 mL VS 120 mL, U=0.05, P=0.784) was observed between the two groups. During a median follow-up of 18 months, no recurrence happened in either group, and the ERCP+En group did not experience biliary pancreatic duct stenosis, while the En group experienced 2 pancreatic duct stenosis and 1 biliary duct stenosis. Endoscopic biliary and pancreatic duct stenting combined with En is an effective way to reduce postoperative pancreatic fistula and avoid long-term complications such as biliary and pancreatic duct stenosis for cystadenoma in pancreatic head.