Comparison of Short-Term Outcomes of Colorectal Cancer Surgery Performed by Male and Female Surgeons: A Japanese Multicenter Study.

Introduction: The number of female doctors is increasing worldwide, but the percentage of female general surgeons and gastrointestinal surgeons remains low, at only 6% in Japan. Furthermore, in rural areas, the number of doctors is small and training opportunities are limited, and training in surgical techniques is reportedly inadequate compared with urban areas. This study examined the current status and surgical outcomes of colorectal cancer surgery by surgeon sex using a multicenter database in a Japanese rural area.

Comparison of robotic and laparoscopic approaches in short- and long-term outcomes of lateral pelvic lymph node dissection for advanced rectal cancer: a Japanese multicenter study.

Background: Lateral pelvic lymph node dissection (LPND) is a challenging surgical technique with complex anatomy and narrow pelvic manipulation. The outcomes of robotic and laparoscopic surgery for LPND are still unclear.

Methods: We retrospectively reviewed 169 consecutive patients who underwent rectal cancer surgery with LPND between 2016 and 2023.

Surgical risk and cause of death among octogenarian and nonagenarian patients with colorectal cancer: a Japanese multicenter study.

Background: The number of elderly people undergoing surgery for colorectal cancer has been increasing. We examine prognosis, including risks of surgery by age and cancer- and noncancer-related deaths.

Methods: This study retrospectively reviewed 1830 patients who underwent curative resection colorectal surgery.

Effect of endoscopic surgical skill qualification system for laparoscopic rectal surgery: Japanese multicenter analysis.

Background: Laparoscopic rectal surgery is often technically difficult. The Endoscopic Surgical Skill Qualification System (ESSQS) was established in Japan as an objective measure of skill for laparoscopic surgeons. However, the advantages of the ESSQS qualification for laparoscopic rectal surgery have been limited.

Laparoscopic colectomy for patients with poor American Society of Anesthesiology classifications.

Introduction: The American Society of Anesthesiologists (ASA) classification is used to assess the fitness of a patient for surgery. Whether laparoscopic surgery is appropriate for colorectal cancer patients with poor ASA performance status (PS) remains unclear.

Methods: Among 4585 patients who underwent colorectal surgery between 2016 and 2023, this study retrospectively reviewed all 458 patients with ASA-PS ≥3.

Risk factors for pulmonary complications after colorectal cancer surgery: a Japanese multicenter study.

Purpose: Pulmonary complications (PC) are a serious condition with a 20% mortality rate. However, few reports have examined risk factors for PC after colorectal surgery. This study investigated the frequency, characteristics, and risk factors for PC after colorectal cancer surgery.

Impact of institutional volume on short- and long-term outcomes after laparoscopic colectomy.

Introduction: The impact of institutional volume on postoperative outcomes after laparoscopic colectomy is still being debated. This study aimed to investigate whether differences in postoperative outcomes of laparoscopic colon resection exist between high- and low-volume centers.

Methods: Data were reviewed for 1360 patients who underwent laparoscopic colectomy for colon cancer between 2016 and 2022.

Short-term outcomes after laparoscopic colorectal cancer surgery in patients over 90 years old: a Japanese multicenter study.

Background: The effect of laparoscopic surgery on short-term outcomes in colorectal cancer patients over 90 years old has remained unclear.

Methods: We reviewed 87 colorectal cancer patients aged over 90 years who underwent surgery between 2016 and 2022. Patients were divided into an open surgery group (n = 22) and a laparoscopic surgery group (n = 65).

Risk factors for reoperation within 30 days in laparoscopic colorectal cancer surgery: A Japanese multicenter study.

Introduction: Thirty-day reoperation rate reflects short-term surgical outcomes following surgery. Laparoscopic surgery for colorectal cancer reportedly has positive effects on postoperative complications. This retrospective study investigated risk factors for 30-day reoperation rate among patients after laparoscopic colorectal cancer surgery using a multicenter database.

Correlations of age with clinicopathological features, perioperative outcomes and the prognosis in patients with colorectal cancer: a Japanese multicenter study.

Purpose: Colorectal cancer is not common in patients under 40 years old, and its associations with clinical features and the prognosis remain uncertain.

Methods: Using a multicenter database, we retrospectively reviewed 3015 patients who underwent colorectal surgery between 2016 and 2021. Patients were divided by age into those < 40 years old (young; n = 52), 40-54 years old (middle-aged; n = 254) and > 54 years old (old; n = 2709).

Usefulness of the endoscopic surgical skill qualification system for laparoscopic colectomy for transverse colon cancer: a Japanese multicenter analysis.

Purpose: Laparoscopic colectomy for transverse colon cancer (TCC) can be technically demanding due to the anatomical complexity of the region. In Japan, the Endoscopic Surgical Skill Qualification System (ESSQS) was established to improve the skill of laparoscopic surgeons and further develop surgical teams. We examined the safety and feasibility of laparoscopic colectomy for TCC and evaluated the effects of the Japanese ESSQS in facilitating this approach.

Incidence of and risk factors for postoperative ileus between right and left laparoscopic colectomy using propensity-score-matched analysis: A retrospective multicenter study.

Instruction: In colon cancer, the incidence of postoperative ileus is reportedly higher for the right-side than for the left-side colon, but those studies included small numbers of subjects and contained several biases. Furthermore, risk factors for postoperative ileus remain unclear.

Methods: This multicenter study reviewed 1986 patients who underwent laparoscopic colectomy between 2016 and 2021 for right-side (n = 907) and left-side (n = 1079) colon cancer.

Efficacy of left colic artery preservation with D3 lymph node dissection in laparoscopic surgery for advanced sigmoid and rectal cancer.

Purpose: For advanced left colon cancer, lymph node dissection at the root of the inferior mesenteric artery is recommended. Whether the left colic artery (LCA) should be preserved or resected remains contentious.

Methods: The 367 patients who underwent laparoscopic sigmoidectomy or anterior resection and who were pathologically node-positive were reviewed.

Effect of adjuvant chemotherapy after curative resection of colorectal cancer peritoneal metastasis.

Purpose: Several guidelines have recommended surgical resection for localized peritoneal metastases, but the prognosis remains poor. In addition, the efficacy of adjuvant chemotherapy (AC) after curative resection is under debate. The present study compared long-term outcomes between curative and non-curative resection and evaluated the effects of AC after curative resection.

Mid-term outcomes of laparoscopic vs open colectomy for pathological T4 and/or N2 colon cancer patients: Multicenter study using propensity score matched analysis.

Objectives: We aimed to assess mid-term outcomes after laparoscopic surgery (LAP) vs open surgery (OP) for pathological T4 (pT4) and/or N2 (pN2) colon cancer.

Methods: We retrospectively reviewed 255 primary tumor resections for pT4 and/or pN2 colon cancer performed from 2015 to 2020 at six hospitals, divided into LAP (n = 204) and OP groups (n = 51). After propensity score matching to minimize selection bias, 47 matched patients per group were assessed.

Effect of oxaliplatin in elderly colon cancer patients with pathological T4 and/or N2 disease: a multicenter, propensity score-matched analysis.

Purpose: Although adjuvant chemotherapy (AC) using fluoro-pyrimidine and oxaliplatin (FU + oxaliplatin) is recommended after curative resection for locally advanced colon cancer patients, several randomized controlled trials have shown no additional effect of oxaliplatin in patients aged ≥ 70 years. Here, we examined the effectiveness of FU + oxaliplatin on the long-term outcome of old patients with a high risk of recurrence.

Methods: This multicenter, retrospective study included 346 colon cancer patients diagnosed with pathological T4 and/or N2 disease from 2016 to 2020.

Short- and long-term outcomes of single-incision laparoscopic surgery for right colon cancer: A multicenter propensity score-matched analysis.

Introduction: Single-incision laparoscopic surgery (SILS) for colon cancer is a recent innovation in minimally invasive surgery that can improve short-term outcome. However, several biases exist in current favorable comparisons of SILS with conventional laparoscopic (CL) surgery. Moreover, the oncological outcomes in SILS remain unclear.

Effect of Neoadjuvant Chemotherapy in Patients With Locally Advanced Rectal Cancer: A Multicenter Propensity Score-matched Analysis.

Background/aim: The effect of neoadjuvant chemotherapy (NAC) and adjuvant chemotherapy (AC) for locally advanced rectal cancer (LARC) is not fully understood. This study aimed to identify outcomes following NAC plus AC for LARC.

Patients And Methods: We reviewed 252 patients who underwent curative resection for LARC.

Charlson comorbidity index predicts anastomotic leakage in patients with resected right-sided colon cancer.

Purpose: Anastomotic leakage after right-sided colon cancer surgery is a serious complication that affects postoperative mortality. The Charlson comorbidity index (CCI) has been reported to be a useful predictor of postoperative complications.

Methods: A total of 593 cases of right-sided colon cancer resections performed from 2016 to 2020 were examined.

Short- and mid-term outcomes of laparoscopic colorectal surgery in patients ≥ 85 years old: a multicenter study using a propensity score-matched analysis.

Purpose: The number of laparoscopic surgeries for colorectal cancer (CRC) in elderly patients has been increasing. We examined the short- and mid-term outcomes of laparoscopic surgery for CRC in oldest-old patients (≥ 85 years old) compared with the outcomes in younger patients (< 85 years old).

Methods: We retrospectively reviewed primary tumor resection for CRC from April 2015 to December 2020 at six hospitals.

Effect of hemodialysis on short-term outcomes after colon cancer surgery.

Background: Hemodialysis patients who undergo surgery have a high risk of postoperative complications. The aim of this study was to determine whether colon cancer surgery can be safely performed in hemodialysis patients.

Methods: This multicenter retrospective study included 1372 patients who underwent elective curative resection surgery for colon cancer between April 2016 and March 2020.

Transanal approach after preoperative imatinib treatment of a rectal gastrointestinal stromal tumors with external anal sphincter invasion: A case report.

Introduction And Importance: Rectal gastrointestinal stromal tumors (GISTs) are rare, and preserving anorectal function can be challenging. We report the case of a patient with rectal GIST with external anal sphincter invasion, treated via the laparoscopic and transanal approaches.

Case Presentation: A 61-year-old man with locally advanced GIST in the right anterolateral wall of the lower rectum was examined.

Effect of endoscopic surgical skill qualification system for laparoscopic multivisceral resection: Japanese multicenter analysis.

Background: The efficacy of laparoscopic multivisceral resection (Lap-MVR) has been reported by several experienced high-volume centers. The Endoscopic Surgical Skill Qualification System (ESSQS) was established in Japan to improve the skill of laparoscopic surgeons and further develop surgical teams. We examined the safety and feasibility of Lap-MVR in general hospitals, and evaluated the effects of the Japanese ESSQS for this approach.

A learning curve in using organ retractor for single-incision laparoscopic right colectomy.

Single-incision laparoscopic surgery (SILS) has the potential to improve perioperative outcomes, including less postoperative pain, shorter operation time, less blood loss, and shorter hospital stay. However, SILS is technically difficult and needs a longer learning curve. Between April 2016 and September 2019, a total of 198 patients with clinical stage I/II right colon cancer underwent curative resection.