Circulating tumour DNA in predicting and monitoring survival of patients with locally advanced rectal cancer undergoing multimodal treatment: long-term results from a prospective multicenter study.

Background: Neoadjuvant chemoradiotherapy (nCRT) is the standard for locally advanced rectal cancer (LARC). However, distant metastasis remains the primary cause of treatment failure. Early identification of high-risk individuals for personalized treatment may offer a solution.

A new treatment strategy for mid-low rectal cancer patients exhibiting a clinical complete or near-complete response to neoadjuvant chemoradiotherapy: Transanal endoscopic microsurgery --A multicenter prospective case-control clinical trial by MONT-R.

Background: Total mesorectal excision is the standard surgery for locally advanced rectal cancer (LARC) after neoadjuvant chemoradiotherapy (nCRT), but it may lead to high complication rates and poor quality of life. This study evaluates whether transanal endoscopic microsurgery (TEM), as a partial resection procedure, can enhance quality of life for clinical complete response (cCR) or near-cCR patients without compromising survival.

Methods: Between May 2017 to September 2021, 80 patients with T3-4N0M0 or TanyN+M0 mid-low rectal cancer achieving cCR or near-cCR post-nCRT were prospectively included at 6 Chinese centers.

Interaction analysis of high-risk pathological features on adjuvant chemotherapy survival benefit in stage II colon cancer patients: a multi-center, retrospective study.

Background: We aimed to analyze the benefit of adjuvant chemotherapy in high-risk stage II colon cancer patients and the impact of high-risk factors on the prognostic effect of adjuvant chemotherapy.

Methods: This study is a multi-center, retrospective study, A total of 931 patients with stage II colon cancer who underwent curative surgery in 8 tertiary hospitals in China between 2016 and 2017 were enrolled in the study. Cox proportional hazard model was used to assess the risk factors of disease-free survival (DFS) and overall survival (OS) and to test the multiplicative interaction of pathological factors and adjuvant chemotherapy (ACT).

Comparing the techniques and outcomes of laparoscopic transverse colectomy to laparoscopic hemicolectomy in mid-transverse colon cancer resection.

Introduction: The mid-transverse colon cancer is relatively uncommon in all colon cancers and the optimal surgical approach of mid-transverse colon cancer remains debatable.

Aim And Objectives: Our study aimed to depict the techniques and outcomes of laparoscopic transverse colectomy in one single clinical center and compare this surgical approach to traditional laparoscopic right hemicolectomy and laparoscopic left hemicolectomy.

Method: This was a retrospective cohort study of patients with mid-transverse colon cancer in one single clinical center from February 2012 to October 2020.

Laparoscopic excision for intrapelvic schwannoma of the sciatic nerve: A case report.

Schwannoma is a benign tumor of the nerve sheath originating from Schwann cells. The tumor rarely occurs in the sciatic nerve. The patient in the present case report was a 58-year-old woman presenting with pain in the right hip and leg, as well as numbness of the right lower limb.

An unusual case of acute lower gastrointestinal bleeding due to fungal infection.

A 63-year-old woman was admitted to our hospital with herpes zoster viral infection and intermittent disorder of consciousness. On day 13 of hospitalization for glucocorticoid treatment, the patient experienced seven episodes of hematochezia. She had a 2-year history of systemic lupus erythematosus and had undergone splenectomy at 40 years of age.

Comparison of safety of loop ileostomy and loop transverse colostomy for low-lying rectal cancer patients undergoing anterior resection: A retrospective, single institution, propensity score-matched study.

Introduction: This study was to compare the prevalence of stoma-related complications and stoma reversal perioperative complications of patients with low-lying rectal cancer who received preventative loop ileostomy and those who underwent loop transverse colostomy.

Methods: This retrospective single-center study analyzed the clinicopathologic and surgical data of 288 patients with pathologically proven primary rectal cancer who underwent anterior resection with either preventative loop ileostomy (n = 82) or loop transverse colostomy. To achieve comparability of a propensity score matching method was used to match patients from each group in a 1:2 ratio.

Laparoscopic resection of large retrorectal developmental cysts in adults: Single-centre experiences of 20 cases.

Context: Retrorectal tumours are rare with developmental cysts being the most common type. Conventionally, large retrorectal developmental cysts (RRDCs) require the combined transabdomino-sacrococcygeal approach.

Aims: This study aims to investigate the surgical outcomes of the laparoscopic approach for large RRDCs.

[Laparoscopic segmental gastrectomy for early gastric cancer].

Objective: To investigate the feasibility of segmental pylorus-reservation gastrectomy in patients with early gastric cancer.

Method: A retrospective cohort study on clinical data of 6 patients strictly met the criteria of early gastric cancer locating in the middle of the stomach undergoing laparoscopic segmental gastrectomy from January 2014 to April 2016 at Department of General Surgery, Peking Union Medical College Hospital was carried out. Preoperative clinical staging revealed T1N0M0 for all the cases.

Prognostic Superiority of Log Odds of Positive Lymph Nodes in Stage 3 Colorectal Cancer.

Objective To evaluate the prognostic value of the log odds of positive lymph nodes (LODDS) in stage 3 colorectal cancer (CRC) patients who have undergone curative resection. Methods We performed a retrospective review of 175 stage 3 CRC patients who underwent curative resection in Peking Union Medical College Hospital from 2005 to 2012. Patients were categorized respectively according to the AJCC/UICC N grade,the metastatic lymph node ratio (LNR),and the ratio of their LODDS.

Laparoscopic restorative proctocolectomy with ileal pouch-anal anastomosis for Peutz-Jeghers syndrome with synchronous rectal cancer.

We report on a patient diagnosed with Peutz-Jeghers syndrome (PJS) with synchronous rectal cancer who was treated with laparoscopic restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA). PJS is an autosomal dominant syndrome characterized by multiple hamartomatous polyps in the gastrointestinal tract, mucocutaneous pigmentation, and increased risks of gastrointestinal and nongastrointestinal cancer. This report presents a patient with a 20-year history of intermittent bloody stool, mucocutaneous pigmentation and a family history of PJS, which together led to a diagnosis of PJS.

[Outcome of laparoscopic radical right hemicolectomy with complete mesocolic resection and D3 lymphadenectomy].

Objective: To investigate the feasibility of laparoscopic approach for totally mesocolic resection and D3 lymphadenectomy in right colectomy.

Methods: A retrospective study was conducted to analyze the operating time, blood loss, lymph node retrieval, postoperative complications and converting rate. The relationships of 3-year disease-free survival (DFS), 3-year overall survival (OS) to gender, age, American Society of Anesthesiologists (ASA) score, body mass index (BMI), T-staging, N-staging and TNM classification were also analyzed by Kaplan-Meier surviving curve and Log-rank test.

[Acquiring laparoscopic skill for colorectal surgery: based on the experience of a colorectal surgeon].

Objective: Laparoscopic colorectal surgery is a skill-dependent procedure. The present study aims to analyze the learning curve of a properly trained surgeon, with basic laparoscopic techniques, to become skillful in performing laparoscopic colorectal operations.

Methods: A series of non-selective, consecutive 189 cases of laparoscopic colorectal surgery were accomplished, from December 2009 to February 2012, by one surgeon with years of skilled technique in laparoscopic cholecystectomy, rich experience in assisting laparoscopic colorectal surgery, and experience of approximately 180 procedures of gastric and colorectal surgery annually.

[Safety and efficacy of prophylactic single antibiotics administration in selective open colorectal surgery].

Objective: To investigate the safety and efficacy of prophylactic single antibiotic administration in selective open colorectal surgery.

Methods: Two hundred and seventy-five patients undergoing selective open colorectal surgery in the Peking Union Medical College Hospital from October 2009 to October 2011 were retrospectively reviewed. Prophylatic single antibiotic administration was used by intravenous infusion 30-60 min before incision.

[A comparative study upon two surgical procedures of local resection of early rectal cancer].

Objective: To compare the application of transanal endoscopic microsurgery (TEM) technique with Mason's operation in the treatment of early rectal cancer.

Methods: Patients with early rectal cancer were divided into two groups according to different surgical procedures they underwent during different period. Patients in Mason Group underwent Mason's operations during the period from January 2000 to March 2006; and in TEM Group were managed with TEM procedures from April 2006 to July 2011.

[Clinical application of anterior perineal plane for ultra-low anterior resection of the rectum].

Objective: To summarize clinical experience in the treatment of low rectal cancer with anterior perineal plane for ultra-low anterior resection of the rectum(APPEAR).

Methods: Clinical and follow-up data of 26 patients with low rectal cancer undergoing the APPEAR operation in Department of General Surgery at Peking Union Medical College from September 2009 to August 2011 were retrospectively analyzed.

Results: The 26 cases consisted of 19 male and 7 female patients with an average age of (63.

[Hand-assisted laparoscopic versus laparoscopic-assisted right hemicolectomy: a clinical controlled study].

Objective: To compare the outcomes of right hemicolectomy performed either by the hand-assisted laparoscopic(HALS) or conventional laparoscopic surgery(LAS).

Methods: Ninety-five patients undergoing HALS(n=47) from March 2002 to November 2006 or by LAS (n=48) from January 2007 to December 2009 were retrospectively studied. All the operations were performed by the same surgical team.

[Efficacy comparison of neoadjuvant radiotherapy with or without chemotherapy for locally advanced rectal cancer].

Objective: To evaluate the efficacy of neoadjuvant radiotherapy alone versus chemoradiotherapy in patients with mid-low locally advanced rectal cancer.

Methods: Data of 69 patients with advanced (stage T(3) or T(4)) rectal cancer, undergone neoadjuvant therapy in our hospital from October 1997 to October 2007, were analyzed retrospectively. Forty patients received preoperative radiotherapy (50 Gy in 25 fractions over 5 weeks) alone (RT group), and 29 patients received preoperative radiotherapy concomitant with 5-FU/leucovorin -based preoperative chemoradiotherapy (CRT group).

[A pilot study on the impact of the drug resistance on the radioresistance in human pancreatic cancer cell lines].

Objective: To investigate the impact of the drug resistance on the radioresistance in human pancreatic cancer cell lines.

Methods: Three drug resistant pancreatic cancer cell sublines induced by fluorouracil (5-FU), adriamycin (ADM) and gemcitabine respectively, SW1990/FU, SW1990/ADM and SW1990/Gz, were tested for the cell cycle and radio-sensitivity with flow cytometry and clonogenic assay.

Results: Compared with SW1990, the cell cycle assay indicated higher G(0)/G(1) period percentage in SW1990/FU and SW1990/Gz, but the G(2)/M period percentage decreased; SW1990/FU had the same while SW1990/Gz had lower S period percentage.

[Drug resistance and activity changes of thioredoxin reductase in pancreatic cancer cells strain SW1990 induced by gemcitabine].

Objective: To establish gemcitabine-resistant pancreatic cancer cell strain and study the role of thioredoxin reductase (TrxR) in drug-resistant process.

Methods: Gemcitabine-resistant pancreatic cancer cell strain SW1990/GZ was induced by increasing drug dosage intermittently, then the changes of its biological features and the activity of TrxR were examined.

Results: Stable drug-resistant SW1990/GZ cell strain was established by culturing with gemcitabine for 9 months.