Objective To evaluate the diagnosis and micro-invasive treatment of ureteral obstruction after complete cystectomy. Methods All the 12 patients (primary diseases:10 cases of bladder tumor,1 of small bladder of tuberculosis,1 of radiocystitis;post-operative ureteral obstruction:9 cases of anastomotic stenosis,3 of supra-anastomotic obstruction) underwent MRI and experienced nephroscopic monitoring for diagnosis.Eleven patients underwent surgical treatment.Of them,6 cases received ureter nickel-titanium alloy trestle;4 cases (6 sides),ureter trestle,and 1,ureterocystostomy. Results All the 12 cases were correctly diagnosed.Of them 11 were followed up for 3 months to 5 years.IVU showed normal renal function and complete resolution of hydronephrosis of the diseased kidneys in 9 cases and relief of hydronephrosis in 2.Cr and BUN were normal in all the cases.Only one case of bladder cancer died of lung metastasis. Conclusions Pelviureteroradiography under MRI or nephroscopic monitoring is the most valuable method of examination for ureteral obstruction after complete cystectomy.Surgical ureter trestle and nickel-titanium alloy ureter trestle are simple,micro-invasive and effective for paitens with such post-operative obstruction.

ObjectiveTo investigate the protein expressions of PTEN and p-Akt in Kaposi's sarcoma (KS) tissue and their significance in the development of KS.MethodsThe EnVision two-step method was used to detect the expressions of PTEN and p-Akt proteins in tissue specimens from the lesions of 17 patients with KS and from the normal skin of 17 normal human controls.ResultsPTEN and P-Akt were mainly expressed in the cytoplasm of cells.No significant difference was observed in the positivity rate of PTEN [76.5％(13/17)vs.88.2％(15/17),P＞ 0.10] between the KS and control specimens.p-Akt was expressed in all(100％) of the 17 KS specimens,but in none of the control specimens.ConclusionThe abnormal expression of PTEN protein may play a certain role in the development of KS.

Aim To improve the biological activity of A-ring modified analogues of camptothecin.Methods A-ring modified camptothecins were synthesized from 10-hydroxycamptothecin or 7-ethyl-10-hydroxycamptothecin (SN-38) in three or four steps. Their cytotoxicity was evaluated using MTT assay,and their in vivo antitumor activity against mouse liver cancer H22 was tested. Results Five hexacyclic camptothecins (6a, 6b, 6c, 7a and 7b) are target compounds, and ten camptothecin derivatives are new compounds. Conclusion The modification of a 1,4-oxazine-2-one ring fused with positions 9 and 10 of Aring will reduce the antitumor activity of camptothecins.

Aim To search for colchicine derivatives which have high efficacy and low toxicity. Methods Colchicine was firstly converted into thiocolchicine, and then it was hydrolyzed to get 7-(N-deacetylthiocolchicine). At last, 7-(N-deacetylthiocolchicine) was amidated to get the target compounds. The chemical structure of these new derivatives was confirmed with 1H NMR, IR, MS, and HR-MS. The cytotoxicity of the compounds was tested by MTT assay. Their in vivo antitumor activity was evaluated against mice tumor H22 and U14. Results Twelve thiocolchicine derivatives are new compounds. Conclusion In vitro antitumor activity has showed that some of these thiocolchicines possessed cytotoxic activity superior to colchicine. However, in vivo antitumor activity indicated that these derivatives have poor efficacy in mice.

Objective: To investigate the indication, feasibility, and safety of da Vinci robotic surgical system in pharyngolaryngeal tumor resection. Methods: Thirty patients were diagnosed with pharyngolaryngeal tumors and treated with a transoral robotic surgery (TORS) in Beijing Anzhen Hospital from June 1, 2016 through November 30, 2017. Inclusion criteria included lesions of the oropharynx (n=13), parapharyngeal space (n=7), larynx (n=6) and hypopharynx (n=4). Twenty cases were males and ten cases were females. The median age was 56 years old (ranging from 30 to 81 years). Results: The robotic surgeries were performed successfully on 30 patients. One patient (3.3%) underwent TORS combined with a neck incision. The mean operative time was 40.7 min. The mean blood loss was 15.8 ml. The mean recovery time for oral intake was 5.3 days. The mean hospital stay was 9 days. None of the patients underwent tracheotomy or mandible split. Postoperative pathological examination showed that 18 cases (60.0%) were malignant and 1 case (5.6%) had positive surgical margin. Sixteen cases received neck dissection. No serious complications occurred during or after the operation. There was no local recurrence, metastasis or death except for regional recurrences in 2 cases (11.1%) with a follow-up of 1 to 18 months(median 13 months). Conclusion Transoral robotic surgery is a feasible, safe and effective surgical procedure with clear operation field, rapid surgical access, minimally invasive surgery, lesser hemorrhage, good cosmetic effect and fast recovery.