Objective:To evaluate the availability and safety of laparoscopic pyeloplasty with extracorporeal ureteral tailor.Methods:Clinical data of 26 patients with ureteropelvic junction obstruction (UPJO)who were treated by laparoscopic combined with extracorporeal ureteral tailor pyeloplasty in our hospital from March 2016 to August 2019 were retrospectively analyzed. There were 19 males and 7 females. 22 cases had unilateral lesion, including 6 cases on the right side and 16 cases on the left; 2 cases were bilateral. The average age was 22.3 years old (6-54 years). 19 cases felt discomfort in the renal region and 7 cases were asymptomatic. The mean body mass index was 21.7 kg/m 2 (17.2- 26.4 kg/m 2). 5 cases had mild hydronephrosis, 17 cases had moderate hydronephrosis and 4 cases had severe hydronephrosis. 6 cases combined with cross vessels. In all the 26 cases, the ureter was pulled out of the abdomen through a laparoscopic incision, cut lengthways in vitro, sutured at the lowest point, and then returned it to the abdomen. Then, double J tube implantation and ureteropelvic anastomosis were performed under the laparoscopy. Results:26 cases were completed successfully without conversion, with the average operation time of 99 minutes (50-158 minutes), the average blood loss of 19.4 ml (10-50 ml), the average hospital stay of 6.5 days (5-11 days), and the average drainage indwelling time of 5.3 days (4-10 days). For complications, urine leakage occurred on the 3rd day after the operation in 1 case, and the daily drainage fluid was more than 500 ml, which decreased suddenly after 4 days. Postoperative average follow-up was 10.8 months (6-24 months). Renal region pain disappeared in all patients. CT reexamination 3 months after the operation showed that hydronephrosis was alleviated or disappeared in 24 cases, and there was no significant change in 2 cases compared with the preoperative images, but no progress was found in the subsequent reexamination, so we didn't deal with the hydronephrosis again.Conclusions:Laparoscopic pyeloplasty combined with extracorporeal ureteral tailor is minimally invasive and flexible, which greatly reduces the difficulty and time of operation, and has a high success rate.

Objective:The purpose of this study was to investigate the expression and role of N-myc downstream regulatory gene 2 (NDRG2) in radiation resistance of bladder cancer cells.Methods:T24 cells were cultured in vitro and irradiated with different doses of X-ray (0, 2, 4, 8, 10 and 20 Gy). The best dose of X-ray was selected for subsequent treatment. The radioresistant BCa cell line T24/R was established. The cytotoxicity of T24/R cells was detected by counting kit-8 (CCK-8) method. The proliferation and invasion ability of T24/R cells and T24 cells were detected by flow cytometry and transwell, respectively. Western blot was used to detect the expression of epithelial mesenchymal transition (EMT) related proteins. The survival rate of T24/R group (control group) and T24/R-NDRG 2 group was detected, and the migration ability of T24/R-NDRG 2 cells was detected after 2 Gy treatment. Results:The cell viability was inhibited significantly when the dose of X-ray was ≥2 Gy X-ray, so 2 Gy X-ray irradiation was chosen as the best condition for BCa cytotoxicity and T24/R radiation resistance cell line was successfully established; Apoptosis test showed that the number of S-phase cells was increased in T24/R group, and the proportion of S-phase cells in T24/R vs T24 was (26.49±4.5)% vs (14±2.6)% ( P<0.05); Transwell test showed that T24/R cells showed stronger migration ability than control group ( P<0.05), but there was no significant difference in EMT related protein expression between the two groups ( P>0.05). Overexpression of NDRG2 can significantly decreased the activity and migration ability of radiation-resistant T24/R cells ( P<0.05) when the radiation dose was gradually increasing in both groups. Conclusions:The radiation resistance of BCa cells is one of the causes of local tumor recurrence. Up-regulation of NDRG2 expression can inhibit the radiation resistance of T24 cells, so it can be used as a candidate for treatment of radiation-resistant BCa patients.