[Study on accuracy of endoscopic polyp size measurement by disposable graduated biopsy forceps].

Objective: To study the accuracy of endoscopic polyp size measurement by disposable graduated biopsy forceps (DGBF).

Methods: Accurate gradation of 1 mm was made in the wire of disposable graduated biopsy forceps, which was used to measure the size of tumors under endoscopy. Fifty-eight polyps from 43 patients underwent endoscopy in our department from May to June 2013 were enrolled.

[Manufacture and application of laparoscopic extraperitoneal sigmoid colostomy].

Objective: To investigate the safety and feasibility of laparoscopic extraperitoneal sigmoid colostomy.

Methods: Thirty-six patients with low rectal cancer undergoing laproscopic abdominoperineal resection from July 2011 to July 2012 were prospectively enrolled in the study and randomly divided into extraperitoneal colostomy group(EPC, n=18) and internal peritoneal colostomy group(IPC, n=18). Follow-up period was 4-16 (median, 7) months and postoperative complications were compared between two groups.

[Impact of polyamidoamine dendrimer liposome on the cellular uptake and cytotoxicity of colonic cancer cells].

Objective: To evaluate the effects of polyamidoamine dendrimer (PAMAM) liposome as gene carriers on the cellular uptake and its cytotoxicity in colonic cancer cell.

Methods: The liposome modified PAMAM was synthesized with liposome and polyamidoamine dendrimer. Plasmid PEGFP-N1 was mixed with the liposome-modified PAMAM or unmodified PAMAM to form nanoparticle complexes.

[Distribution characteristics of colorectal neoplasm in 4450 patients and implication for colorectal cancer screening].

Objective: To study the distribution characteristics of colorectal neoplasm and evaluate the implication for colorectal cancer screening.

Methods: A total of 17,939 colonoscopies were performed in the National Center of Colorectal Surgery between October 2004 and June 2009. Characteristics of colorectal neoplasm including anatomical distribution, sex, and age were investigated.

[Indications for colonoscopy examination and its disease distribution: a report of 5690 cases].

Objective: To explore the indications for colonoscopy examination and the distribution of diagnostic diseases.

Method: From Jan. 2000 to Dec.