Annals of Coloproctology

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Review

Translation/basic research

Extracellular vesicles in colorectal cancer: Young Il Kim, Chungyeop Lee, Hakho Lee, In Ja Park; Ann Coloproctol. 2025;41(5):379-392. Published online October 16, 2025; DOI: https://doi.org/10.3393/ac.2025.00745.0106

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Abstract PDF: Colorectal cancer (CRC) remains a major global health issue, with challenges including early detection and recurrence monitoring. While colonoscopy and fecal-based tests are standard screening tools, their limitations have driven interest in less invasive alternatives. Extracellular vesicles (EVs) present in patient liquid biopsy samples have emerged as potential biomarkers and therapeutic tools in CRC. EVs carry molecular cargo, including nucleic acids and proteins, that reflect the status of their cells of origin and can be readily accessed through minimally invasive liquid biopsy. This review outlines the role of EVs in the initiation and progression of CRC, summarizes recent advances in EV isolation techniques, and highlights candidate EV-derived biomarkers for diagnosis, prognosis, and treatment monitoring. By providing an updated synthesis of current research, this review aims to inform future studies and support clinical translation of EV-based approaches in CRC.

Original Articles

Minimally invasive surgery

Comparative perioperative outcomes of articulated versus conventional straight devices in laparoscopic low anterior resection: a propensity score–matched analysis: Hayoung Lee, Yong Sik Yoon, Young Il Kim, Min Hyun Kim, Jong Lyul Lee, Chan Wook Kim, In Ja Park, Seok-Byung Lim; Ann Coloproctol. 2025;41(5):434-442. Published online October 16, 2025; DOI: https://doi.org/10.3393/ac.2025.00227.0032

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Abstract PDF Supplementary Material: Purpose
Laparoscopic low anterior resection for rectal cancer is technically challenging due to the precision required for mesorectal excision. Articulated instruments were developed to improve precision and oncological safety over conventional instruments. This study compares their perioperative outcomes.
Methods
A retrospective cohort study of 432 patients with colorectal cancer who underwent low anterior resection between August 2022 and February 2024 applied propensity score matching to minimize selection bias. Primary endpoints were circumferential resection margin (CRM), distal resection margin (DRM), and harvested lymph nodes count. Secondary outcomes included postoperative complications.
Results
Following propensity score matching, 84 matched pairs were analyzed. Most patients achieved CRM negativity (>1 mm), with CRM ≥10 mm in 67.9% of the articulated group and 59.5% of the conventional group (P=0.613). Median (interquartile range, IQR) lymph nodes harvests were comparable (20 [14–26] vs. 18 [14–22], P=0.147). The articulated group had a significantly longer DRM (30.0 mm [IQR, 18.0–40.0 mm] vs. 24.0 mm [IQR, 12.0–34.2 mm], P=0.008) and the median operation time (111.0 minutes [IQR, 95.8–125.2 minutes] vs. 99.5 minutes [IQR, 72.0–119.8 minutes], P=0.009). Estimated blood loss, open conversion rates, and postoperative complications, including leakage (7.1% vs. 8.3%, P>0.999) and surgical site infections, (15.5% vs. 9.5%, P=0.383), showed no significant differences.
Conclusion
Articulated laparoscopic instruments demonstrated comparable safety and feasibility to conventional instruments but offered no significant clinical or oncological benefits beyond a longer DRM. Larger studies are needed to evaluate their value in laparoscopic rectal surgery.

Anorectal benign disease

Effects of clinical information on the treatment decisions for good responders to neoadjuvant chemoradiotherapy among rectal cancer patients: Eon Bin Kim, In Ja Park, Hwa Jung Kim, Jong Keon Jang, Seong Ho Park, Young Il Kim, Min Hyun Kim, Jong Lyul Lee, Chan Wook Kim, Yong Sik Yoon, Seok-Byung Lim, Chang Sik Yu; Ann Coloproctol. 2025;41(5):473-482. Published online July 10, 2025; DOI: https://doi.org/10.3393/ac.2024.00276.0039

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Abstract PDF Supplementary Material: Purpose
The decision for treatment after neoadjuvant chemoradiotherapy (nCRT) in rectal cancer is intricately linked to tumor response and clinical parameters. This study was designed to elucidate determinants influencing treatment decisions for good responders to nCRT, while concurrently evaluating the ramifications of modifications in magnetic resonance imaging (MRI) tumor response evaluation protocols.
Methods
A survey was constructed with 5 cases of good responder after nCRT based on the magnetic resonance–based tumor regression grade (mrTRG) criteria. A total of 35 colorectal surgeons in Korea participated in the survey via email, and they were introduced to 2 discrete MRI-based tumor response evaluation methodologies: the conventional mrTRG and an emergent complete response (CR)/non-CR classification system. Surgeons were directed to select between total mesorectal excision, local excision, or a watch and wait strategy.
Results
Treatment decisions varied significantly (P<0.01), as gradually more clinical information was provided with mrTRG. The paradigm shift from mrTRG to CR/non-CR evaluation criterion instigated the highest alteration in decision (P<0.01). Even comparing with other sets of information, decision change with different tumor response assessment (i.e., mrTRG vs. CR/non-CR) was statistically significant (P<0.01). Three particular cases consistently displayed a declining predilection for total mesorectal excision, favoring a more pronounced inclination towards watch and wait strategy or local excision. Nonetheless, the magnitude of these decisional shifts oscillated depending on the specific endoscopic imagery present.
Conclusion
Our current findings underscore the significant role of tumor response assessment methods in shaping treatment decisions for rectal cancer patients who respond well to nCRT. This highlights the need for clear and accurate tools to interpret MRI results.

Editorial

Colorectal cancer

Less is more: simplifying patient-centered cancer care: In Ja Park; Ann Coloproctol. 2025;41(3):173-174. Published online June 30, 2025; DOI: https://doi.org/10.3393/ac.2025.00738.0105

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Review

Inflammatory/benign bowel disease

Clinical outcomes and optimal indications for nonoperative management of acute appendicitis in adult patients: a comprehensive literature review: Hyun Gu Lee, In Ja Park; Ann Coloproctol. 2025;41(2):107-118. Published online April 16, 2025; DOI: https://doi.org/10.3393/ac.2023.00192.0027

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1 Web of Science
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Graphical Abstract Abstract PDF

Appendectomy as the standard treatment for acute appendicitis has been challenged by accumulating evidence supporting nonoperative management with antibiotics as a potential primary treatment. This review aimed to summarize the clinical outcomes and the optimal indications for nonoperative management of acute appendicitis in adults. Current evidence suggests that uncomplicated and complicated appendicitis have different pathophysiologies and should be treated differently. Nonoperative management for uncomplicated appendicitis was not inferior to appendectomy in terms of complications and length of stay, with less than a 30% failure rate at 1 year. The risk of perforation and postoperative complications did not increase even if nonoperative management failed. Complicated appendicitis with localized abscess or phlegmon could also be treated conservatively, with a success rate of more than 80%. An interval appendectomy following successful nonoperative management is recommended only for patients over the age of 40 years to exclude appendiceal malignancy. The presence of appendicoliths increased the risk of treatment failure and complications; thus, it may be an indication for appendectomy. Nonoperative management is a safe and feasible option for both uncomplicated and complicated appendicitis. Patients should be informed that nonoperative management may be a safe alternative to surgery, with the possibility of treatment failure.

Citations

Citations to this article as recorded by

Appendicolith in non-operative management of acute appendicitis: Implications for recurrence and future directions
Ju Tian
World Journal of Clinical Cases.2025;[Epub] CrossRef

Editorial

From the Editor: Uniting expertise, a new era of global collaboration in coloproctology: In Ja Park; Ann Coloproctol. 2024;40(4):285-286. Published online August 30, 2024; DOI: https://doi.org/10.3393/ac.2024.00514.0073

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Original Articles

Colorectal cancer

Oncologic outcomes and associated factors of colon cancer patients aged 70 years and older: Byeo Lee Lim, In Ja Park, Jun-Soo Ro, Young Il Kim, Seok-Byung Lim, Chang Sik Yu; Ann Coloproctol. 2025;41(3):198-206. Published online August 5, 2024; DOI: https://doi.org/10.3393/ac.2023.00367.0052

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5 Citations

Abstract PDF Supplementary Material

Purpose
The aim of this study was to examine the prognosis and associated risk factors, including adjuvant chemotherapy (CTx), in elderly patients with colon cancer.
Methods
This retrospective study included patients who underwent radical resection for colon cancer between January 2010 and December 2014 at Asan Medical Center. The effects of stage, risk factors, and chemotherapy on overall survival (OS) and recurrence-free survival (RFS) were compared in patients aged ≥70 and <70 years.
Results
Of 3,313 patients, 933 (28.1%) was aged ≥70 years. Of the 1,921 patients indicated for adjuvant CTx, 1,294 of 1,395 patients (92.8%) aged <70 years and 369 of 526 patients (70.2%) aged ≥70 years received adjuvant CTx. Old age (≥70 years) was independently associated with RFS in overall cohort. Among patients aged ≥70 years indicated for adjuvant CTx, the 5-year OS (81.6% vs. 50.4%, P<0.001) and RFS (82.9% vs. 67.4%, P=0.025) rates were significantly higher in those who did than did not receive adjuvant CTx. Additionally, adjuvant CTx was confirmed as independent risk factor of both OS and RFS in patients aged ≥70 years indicated for adjuvant CTx.
Conclusion
Old age was associated with poor RFS and adjuvant CTx had benefits in OS as well as RFS in elderly patients eligible for adjuvant CTx.

Citations

Citations to this article as recorded by

Immunological changes and recovery-related factors in older patients with colon cancer: A pilot trial
Byeo Lee Lim, Young Il Kim, Jong Lyul Lee, Chan Wook Kim, Yong Sik Yoon, Yousun Ko, Kyung Won Kim, In Ja Park
Journal of Geriatric Oncology.2025; 16(3): 102200. CrossRef
Stage II-III colorectal cancer in geriatric patients: Clinicopathological features and chemotherapy utilization
Yakup Duzkopru, Özlem Doğan
Turkish Journal of Clinics and Laboratory.2025; 16(1): 118. CrossRef
Does Oxaliplatin-based Adjuvant Therapy Benefit Older Colorectal Cancer Patients?
Peter Hofland
Onco Zine - The International Oncology Network.2025;[Epub] CrossRef
Early detection of anastomotic leakage in colon cancer surgery: the role of early warning score and C-reactive protein
Gyung Mo Son
Annals of Coloproctology.2024; 40(5): 415. CrossRef
Efficacy of Neoadjuvant Hypofractionated Chemoradiotherapy in Elderly Patients with Locally Advanced Rectal Cancer: A Single-Center Retrospective Analysis
Jae Seung Kim, Jaram Lee, Hyeung-min Park, Soo Young Lee, Chang Hyun Kim, Hyeong Rok Kim
Cancers.2024; 16(24): 4280. CrossRef

Colorectal cancer

Partial mesorectal excision can be a primary option for middle rectal cancer: a propensity score–matched retrospective analysis: Ee Jin Kim, Chan Wook Kim, Jong Lyul Lee, Yong Sik Yoon, In Ja Park, Seok-Byung Lim, Chang Sik Yu, Jin Cheon Kim; Ann Coloproctol. 2024;40(3):253-267. Published online March 31, 2023; DOI: https://doi.org/10.3393/ac.2022.00689.0098

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Abstract PDF

Purpose
Although partial mesorectal excision (PME) and total mesorectal excision (TME) is primarily indicated for the upper and lower rectal cancer, respectively, few studies have evaluated whether PME or TME is more optimal for middle rectal cancer.
Methods
This study included 671 patients with middle and upper rectal cancer who underwent robot-assisted PME or TME. The 2 groups were optimized by propensity score matching of sex, age, clinical stage, tumor location, and neoadjuvant treatment.
Results
Complete mesorectal excision was achieved in 617 of 671 patients (92.0%), without showing a difference between the PME and TME groups. Local recurrence rate (5.3% vs. 4.3%, P>0.999) and systemic recurrence rate (8.5% vs. 16.0%, P=0.181) also did not differ between the 2 groups, in patients with middle and upper rectal cancer. The 5-year disease-free survival (81.4% vs. 74.0%, P=0.537) and overall survival (88.0% vs. 81.1%, P=0.847) also did not differ between the PME and TME groups, confined to middle rectal cancer. Moreover, 5-year recurrence and survival rates were not affected by distal resection margins of 2 cm (P=0.112) to 4 cm (P>0.999), regardless of pathological stages. Postoperative complication rate was higher in the TME than in the PME group (21.4% vs. 14.5%, P=0.027). Incontinence was independently associated with TME (odds ratio [OR], 2.009; 95% confidence interval, 1.015–3.975; P=0.045), along with older age (OR, 4.366, P<0.001) and prolonged operation time (OR, 2.196; P=0.500).
Conclusion
PME can be primarily recommended for patients with middle rectal cancer with lower margin of >5 cm from the anal verge.

Citations

Citations to this article as recorded by

Review of definition and treatment of upper rectal cancer
Elias Karam, Fabien Fredon, Yassine Eid, Olivier Muller, Marie Besson, Nicolas Michot, Urs Giger-Pabst, Arnaud Alves, Mehdi Ouaissi
Surgical Oncology.2024; 57: 102145. CrossRef
Tumour-specific mesorectal excision for rectal cancer: Systematic review and meta-analysis of oncological and functional outcomes
Fabio Carbone, Wanda Petz, Simona Borin, Emilio Bertani, Stefano de Pascale, Maria Giulia Zampino, Uberto Fumagalli Romario
European Journal of Surgical Oncology.2023; 49(11): 107069. CrossRef

Malignant disease,Epidemiology & etiology

Colorectal cancer mortality trends in the era of cancer survivorship in Korea: 2000–2020: Min Hyun Kim, Sanghee Park, Nari Yi, Bobae Kang, In Ja Park; Ann Coloproctol. 2022;38(5):343-352. Published online October 28, 2022; DOI: https://doi.org/10.3393/ac.2022.00535.0076

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23 Citations

Graphical Abstract Abstract PDF Supplementary Material

Purpose
Korea has implemented an early screening for colorectal cancer since 2004. However, it is not known whether this has translated into improved survival over the years.
Methods
We acquired colorectal cancer mortality data from the Cause of Death Statistics in Korea from 2000 to 2020. We characterized the data into year of death, cancer-specific loci, and age group. We analyzed age-standardized mortality rates (ASMR) according to year of death, age group, and primary location to find trends in colorectal cancer mortality over a 20-year period.
Results
The crude mortality rate of colorectal cancer increased from 8.78 per 100,000 in 2000 to 17.27 per 100,000 in 2020. The second decade was slower in increments compared to the first decade. ASMR showed a decrease over the second decade after an initial increase in the first decade. The decrease was primarily from the lowering of ASMR for rectosigmoid cancers. Age group analysis showed a lowering of ASMR mainly in the 45–59-year, 60–74-year, and ≥ 75-year age groups; however, 0–29-year and 30–44-year age groups showed generally unchanged ASMR over the total period.
Conclusion
After a brief incline of age-specific mortality of colorectal cancers during the early 2000s, colorectal cancer mortality has gradually been decreasing in the past decade. This was mainly due to decreased mortalities in rectosigmoid colon cancers especially in the age groups that were the target of early screening.

Citations

Citations to this article as recorded by

Immunological changes and recovery-related factors in older patients with colon cancer: A pilot trial
Byeo Lee Lim, Young Il Kim, Jong Lyul Lee, Chan Wook Kim, Yong Sik Yoon, Yousun Ko, Kyung Won Kim, In Ja Park
Journal of Geriatric Oncology.2025; 16(3): 102200. CrossRef
Oncologic outcomes of surgically treated colorectal cancer in octogenarians: a comparative study using inverse probability of treatment weighting (IPTW)
Soo Young Oh, Jung Yun Park, Kwan Mo Yang, Seong-A Jeong, Yong Jae Kwon, Yun Tae Jung, Chung Hyeun Ma, Keong Won Yun, Kwang Hyun Yoon, Jae Young Kwak, Chang Sik Yu
BMC Gastroenterology.2025;[Epub] CrossRef
Oncologic outcomes and associated factors of colon cancer patients aged 70 years and older
Byeo Lee Lim, In Ja Park, Jun-Soo Ro, Young Il Kim, Seok-Byung Lim, Chang Sik Yu
Annals of Coloproctology.2025; 41(3): 198. CrossRef
Older Age Threshold for Oxaliplatin Benefit in Stage II to III Colorectal Cancer
Jun Woo Bong, Hwamin Lee, Seogsong Jeong, Sanghee Kang
JAMA Network Open.2025; 8(8): e2525660. CrossRef
Primary tumor resection vs. self-expandable metallic stent in unresectable obstructive stage IV colorectal cancer: a comparative outcome study
Chang Hyun Kim, Jae Kyun Ju, Jaram Lee, Hyeung-min Park, Soo Young Lee, Hyeong Rok Kim, Young Eun Joo, Sung Bum Cho
Annals of Surgical Treatment and Research.2025; 109(2): 89. CrossRef
Evaluation of the utility of a nomogram for predicting lymph node metastasis in T1 colorectal cancer in shared decision-making in clinical practice: a survey-based study
Hyeon Seung Kim, Kyung Su Han, Min Wan Lee, Dae Kyung Sohn, Chang Won Hong, Dong Woon Lee, Kiho You, Sung Chan Park, Byung Chang Kim, Bun Kim, Jae Hwan Oh
Annals of Coloproctology.2025; 41(4): 303. CrossRef
Performance reporting design in artificial intelligence studies using image-based TNM staging and prognostic parameters in rectal cancer: a systematic review
Minsung Kim, Taeyong Park, Bo Young Oh, Min Jeong Kim, Bum-Joo Cho, Il Tae Son
Annals of Coloproctology.2024; 40(1): 13. CrossRef
Sex Disparities in Rectal Cancer Surgery: An In-Depth Analysis of Surgical Approaches and Outcomes
Chungyeop Lee, In Ja Park
The World Journal of Men's Health.2024; 42(2): 304. CrossRef
In-Hospital Mortality and Associated Factors among Colorectal Cancer Patients in Germany
Karel Kostev, Sarah Krieg, Andreas Krieg, Tom Luedde, Sven H. Loosen, Christoph Roderburg
Cancers.2024; 16(6): 1219. CrossRef
Effect of Fluorescence Lymph Node Mapping on Improving Diagnostic Values of CT D3 Lymph Node Staging for Right-Sided Colon Cancer
Gyung Mo Son, Tae Un Kim, Mi Sook Yun, ChangYeop Kim, In Young Lee, Su Bum Park, Dong-Hoon Shin, Gi Won Ha
Cancers.2024; 16(20): 3496. CrossRef
Gochujang suppresses cell survival and changes reactive oxygen species metabolism in colorectal cancer cells
Eun-Bi Seo, So-Min Oh, Anna Han
Food & Nutrition Research.2024;[Epub] CrossRef
Optimal Indocyanine Green Dosage for Repetitive Angiography for Laparoscopic Colorectal Surgery
Gyung Mo Son, Sang-Ho Park, Nam Su Kim, Mi Sook Yun, In Young Lee, Myeong-Sook Kwon, Tae Kyun Kim, Eun Hwa Lee, Eun Jung Hwang, Kwang-Ryul Baek
Medicina.2024; 60(12): 1966. CrossRef
Beyond survival: a comprehensive review of quality of life in rectal cancer patients
Won Beom Jung
Annals of Coloproctology.2024; 40(6): 527. CrossRef
Clinical implication of tissue carcinoembryonic antigen expression in association with serum carcinoembryonic antigen in colorectal cancer
Abdulmohsin Fawzi Aldilaijan, Young Il Kim, Chan Wook Kim, Yong Sik Yoon, In Ja Park, Seok-Byung Lim, Jihun Kim, Jun-Soo Ro, Jin Cheon Kim
Scientific Reports.2023;[Epub] CrossRef
Development and validation of nomogram models to predict radiotherapy or chemotherapy benefit in stage III/IV gastric adenocarcinoma with surgery
Xiangqing Ren, Tian Huang, Xiaolong Tang, Qian Ma, Ya Zheng, Zenan Hu, Yuping Wang, Yongning Zhou
Frontiers in Oncology.2023;[Epub] CrossRef
Prognostic prediction of colorectal cancer using the C-reactive protein to albumin ratio: the importance of inflammatory biomarkers and their association with long-term outcomes
Chul Seung Lee
Annals of Coloproctology.2023; 39(4): 287. CrossRef
Unveiling the profound advantages of total neoadjuvant therapy in rectal cancer: a trailblazing exploration
Kyung Uk Jung, Hyung Ook Kim, Hungdai Kim, Donghyoun Lee, Chinock Cheong
Annals of Surgical Treatment and Research.2023; 105(6): 341. CrossRef
National cancer screening program for colorectal cancer in Korea
Seung Min Baik, Ryung-Ah Lee
Annals of Surgical Treatment and Research.2023; 105(6): 333. CrossRef
Recurrence Patterns and Risk Factors after Curative Resection for Colorectal Cancer: Insights for Postoperative Surveillance Strategies
Hyo Seon Ryu, Jin Kim, Ye Ryung Park, Eun Hae Cho, Jeong Min Choo, Ji-Seon Kim, Se-Jin Baek, Jung-Myun Kwak
Cancers.2023; 15(24): 5791. CrossRef
Influence of the COVID-19 Pandemic on the Treatment Patterns and Outcomes of Colorectal Cancer
In Ja Park
The Ewha Medical Journal.2023;[Epub] CrossRef
How Can We Improve the Tumor Response to Preoperative Chemoradiotherapy for Locally Advanced Rectal Cancer?
Jeonghee Han
The Ewha Medical Journal.2023;[Epub] CrossRef
Inflammatory Response Markers as Predictors of Colorectal Cancer Prognosis
Minsung Kim, Il Tae Son, Bo Young Oh
The Ewha Medical Journal.2023;[Epub] CrossRef
Preventing Anastomotic Leakage, a Devastating Complication of Colorectal Surgery
Hyun Gu Lee
The Ewha Medical Journal.2023;[Epub] CrossRef

Editorial

Malignant disease,Rectal cancer

Precision medicine for primary rectal cancer will become a reality: In Ja Park; Ann Coloproctol. 2022;38(4):281-282. Published online August 29, 2022; DOI: https://doi.org/10.3393/ac.2022.00500.0071

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7 Web of Science
8 Citations

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Citations

Citations to this article as recorded by

Was there any change in surgical treatment for colorectal cancer during the COVID-19 pandemic?
Yeajin Moon, Seung Hun Lee, Seung Hyun Lee
Kosin Medical Journal.2025; 40(3): 207. CrossRef
Performance reporting design in artificial intelligence studies using image-based TNM staging and prognostic parameters in rectal cancer: a systematic review
Minsung Kim, Taeyong Park, Bo Young Oh, Min Jeong Kim, Bum-Joo Cho, Il Tae Son
Annals of Coloproctology.2024; 40(1): 13. CrossRef
Beyond survival: a comprehensive review of quality of life in rectal cancer patients
Won Beom Jung
Annals of Coloproctology.2024; 40(6): 527. CrossRef
Unveiling the profound advantages of total neoadjuvant therapy in rectal cancer: a trailblazing exploration
Kyung Uk Jung, Hyung Ook Kim, Hungdai Kim, Donghyoun Lee, Chinock Cheong
Annals of Surgical Treatment and Research.2023; 105(6): 341. CrossRef
Preventing Anastomotic Leakage, a Devastating Complication of Colorectal Surgery
Hyun Gu Lee
The Ewha Medical Journal.2023;[Epub] CrossRef
Influence of the COVID-19 Pandemic on the Treatment Patterns and Outcomes of Colorectal Cancer
In Ja Park
The Ewha Medical Journal.2023;[Epub] CrossRef
How Can We Improve the Tumor Response to Preoperative Chemoradiotherapy for Locally Advanced Rectal Cancer?
Jeonghee Han
The Ewha Medical Journal.2023;[Epub] CrossRef
Inflammatory Response Markers as Predictors of Colorectal Cancer Prognosis
Minsung Kim, Il Tae Son, Bo Young Oh
The Ewha Medical Journal.2023;[Epub] CrossRef

Original Articles

Colorecal cancer

Prognostic significance of lymph node yield on oncologic outcomes according to tumor response after preoperative chemoradiotherapy in rectal cancer patients: Hyo Seon Ryu, In Ja Park, Bo Kyung Ahn, Min Young Park, Min Sung Kim, Young Il Kim, Seok-Byung Lim, Jin Cheon Kim; Ann Coloproctol. 2023;39(5):410-420. Published online April 28, 2022; DOI: https://doi.org/10.3393/ac.2022.00143.0020

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6 Web of Science
5 Citations

Graphical Abstract Abstract PDF

Purpose
This study aimed to evaluate the predictive value of lymph node yield (LNY) for survival outcomes according to tumor response after preoperative chemoradiotherapy (PCRT) in patients with rectal cancer.
Methods
This study was a retrospective study conducted in a tertiary center. A total of 1,240 patients with clinical stage II or III rectal cancer who underwent curative resection after PCRT between 2007 and 2016 were included. Patients were categorized into the good response group (tumor regression grade [TRG], 0–1) or poor response group (TRG, 2–3). Propensity score matching was performed for age, sex, and pathologic stage between LNY of ≥12 and LNY of <12 within tumor response group. The primary outcome was 5-year disease-free survival (DFS) and overall survival (OS).
Results
LNY and positive lymph nodes were inversely correlated with TRG. In good responders, 5-year DFS and 5-year OS of patients with LNY of <12 were better than those with LNY of ≥12, but there was no statistical significance. In poor responders, the LNY of <12 group had worse survival outcomes than the LNY of ≥12 group, but there was also no statistical significance. LNY of ≥12 was not associated with DFS and OS in multivariate analysis.
Conclusion
LNY of <12 showed contrasting outcomes between the good and poor responders in 5-year DFS and OS. LNY of 12 may not imply adequate oncologic surgery or proper staging in rectal cancer patients treated by PCRT. Furthermore, a decrease in LNY should be comprehended differently according to tumor response.

Citations

Citations to this article as recorded by

Breaking Myths: Comparable Outcomes in Lymph Node Analysis Across Surgical Methods
Salvatore Pezzino, Tonia Luca, Mariacarla Castorina, Giulia Fuccio Sanzà, Gaetano Magro, Stefano Puleo, Ornella Coco, Sergio Castorina
Cancers.2025; 17(8): 1312. CrossRef
A predictive nomogram for assessing the likelihood of retrieving 12 lymph nodes after rectal cancer surgery: a single-center study
Jian Ma, Runyang Hao, Shuai Jiao, Qingmin Chen, Baohong Yang, Xu Guan, Jiale Li, Xinxuan Zhao, Yu Huo, Qingxia Xu, Haiyi Liu, Wen Su, Xishan Wang
Frontiers in Oncology.2025;[Epub] CrossRef
Effects of Adjuvant Chemotherapy on Oncologic Outcomes in Patients With Stage ⅡA Rectal Cancer Above the Peritoneal Reflection Who Did Not Undergo Preoperative Chemoradiotherapy
Hyo Seon Ryu, Jong Lyul Lee, Chan Wook Kim, Yong Sik Yoon, In Ja Park, Seok-Byung Lim, Yong Sang Hong, Tae Won Kim, Chang Sik Yu
Clinical Colorectal Cancer.2024; 23(4): 392. CrossRef
Artificial Intelligence-Driven Volumetric Analysis of Muscle Mass as a Predictor of Tumor Response to Neoadjuvant Chemoradiotherapy in Patients with Rectal Cancer
Minsung Kim, Sang Min Lee, Il Tae Son, Jaewoong Kang, Gyoung Tae Noh, Bo Young Oh
Journal of Clinical Medicine.2024; 13(23): 7018. CrossRef
Multidisciplinary Treatment Strategy for Early Colon Cancer: A Review-An English Version
Gyung Mo Son, Su Bum Park, Tae Un Kim, Byung-Soo Park, In Young Lee, Joo-Young Na, Dong Hoon Shin, Sang Bo Oh, Sung Hwan Cho, Hyun Sung Kim, Hyung Wook Kim
Journal of the Anus, Rectum and Colon.2022; 6(4): 203. CrossRef

Colorectal cancer

Efficacy of preoperative chemoradiotherapy in patients with cT2N0 distal rectal cancer: Min Young Park, Chang Sik Yu, Tae Won Kim, Jong Hoon Kim, Jin-hong Park, Jong Lyul Lee, Yong Sik Yoon, In Ja Park, Seok-Byung Lim, Jin Cheon Kim; Ann Coloproctol. 2023;39(3):250-259. Published online April 4, 2022; DOI: https://doi.org/10.3393/ac.2022.00066.0009

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Graphical Abstract Abstract PDF Supplementary Material

Purpose
This study was designed to determine the feasibility of preoperative chemoradiotherapy (PCRT) in patients with clinical T2N0 distal rectal cancer.
Methods
Patients who underwent surgery for clinical T2N0 distal rectal cancer between January 2008 and December 2016 were included. Patients were divided into PCRT and non-PCRT groups. Non-PCRT patients underwent radical resection or local excision (LE) according to the surgeon’s decision, and PCRT patients underwent surgery according to the response to PCRT. Patients received 50.0 to 50.4 gray of preoperative radiotherapy with concurrent chemotherapy.
Results
Of 127 patients enrolled, 46 underwent PCRT and 81 did not. The mean distance of lesions from the anal verge was lower in the PCRT group (P=0.004). The most frequent operation was transanal excision and ultralow anterior resection in the PCRT and non-PCRT groups, respectively. Of the 46 patients who underwent PCRT, 21 (45.7%) achieved pathologic complete response, including 15 of the 24 (62.5%) who underwent LE. Rectal sparing rate was significantly higher in the PCRT group (11.1% vs. 52.2%, P<0.001). There were no significant differences in 3- and 5-year overall survival and recurrence-free survival regardless of PCRT or surgical procedures.
Conclusion
PCRT in clinical T2N0 distal rectal cancer patients increased the rectal sparing rate via LE and showed acceptable oncologic outcomes. PCRT may be a feasible therapeutic option to avoid abdominoperineal resection in clinical T2N0 distal rectal cancer.

Citations

Citations to this article as recorded by

Lymph node metastasis following chemoradiotherapy in advanced rectal cancer: ypT2-focused analyses of total mesorectal excision specimens
A. N. Singhi, T.-G. Lee, H.-M. Ahn, H.-R. Shin, M. J. Choi, M. H. Jo, H.-K. Oh, D.-W. Kim, S.-B. Kang
Techniques in Coloproctology.2025;[Epub] CrossRef
Performance reporting design in artificial intelligence studies using image-based TNM staging and prognostic parameters in rectal cancer: a systematic review
Minsung Kim, Taeyong Park, Bo Young Oh, Min Jeong Kim, Bum-Joo Cho, Il Tae Son
Annals of Coloproctology.2024; 40(1): 13. CrossRef
Comparative analysis of organ preservation attempt and radical surgery in clinical T2N0 mid to low rectal cancer
Hyeung-min Park, Jaram Lee, Soo Young Lee, Chang Hyun Kim, Hyeong Rok Kim
International Journal of Colorectal Disease.2024;[Epub] CrossRef
Organ preservation for early rectal cancer using preoperative chemoradiotherapy
Gyung Mo Son
Annals of Coloproctology.2023; 39(3): 191. CrossRef
Unveiling the profound advantages of total neoadjuvant therapy in rectal cancer: a trailblazing exploration
Kyung Uk Jung, Hyung Ook Kim, Hungdai Kim, Donghyoun Lee, Chinock Cheong
Annals of Surgical Treatment and Research.2023; 105(6): 341. CrossRef

Editorial

Malignant disease,Postoperative outcome & ERAS,Functional outcome

Future direction of Enhanced Recovery After Surgery (ERAS) program in colorectal surgery: In Ja Park; Ann Coloproctol. 2022;38(1):1-2. Published online February 23, 2022; DOI: https://doi.org/10.3393/ac.2022.00094.0013

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Clinical outcomes and future directions of enhanced recovery after surgery in colorectal surgery: a narrative review
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The Ewha Medical Journal.2024;[Epub] CrossRef
Beyond the Operating Room: A Narrative Review of Enhanced Recovery Strategies in Colorectal Surgery
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Comment from Editor-in-Chief: Master Class 2021

It Is a Pleasure to Announce the Issue Titled “Master Class 2021” in Annals of Coloproctology: In Ja Park; Ann Coloproctol. 2021;37(6):349-350. Published online December 22, 2021; DOI: https://doi.org/10.3393/ac.2021.00997.0142

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Original Article

Malignant disease, Rectal cancer,Colorectal cancer,Epidemiology & etiology

Clinicopathological Characteristics and Surgical Outcomes of Crohn Disease-Associated Colorectal Malignancy: Yoo Na Lee, Jong Lyul Lee, Chang Sik Yu, Jong Beom Kim, Seok-Byung Lim, In Ja Park, Young Sik Yoon, Chan Wook Kim, Suk-Kyun Yang, Byong Duk Ye, Sang Hyoung Park, Jin Cheon Kim; Ann Coloproctol. 2021;37(2):101-108. Published online April 30, 2021; DOI: https://doi.org/10.3393/ac.2020.11.02

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Abstract PDF Supplementary Material

Purpose
Carcinoma arising from Crohn disease (CD) is rare, and there is no clear guidance on how to properly screen for at-risk patients and choose appropriate care. This study aimed to evaluate the clinicopathological characteristics, treatment, and oncologic outcomes of CD patients diagnosed with colorectal cancer (CRC).
Methods
Using medical records, we retrospectively enrolled a single-center cohort of 823 patients who underwent abdominal surgery for CD between January 2006 and December 2015. CD-associated CRC patients included those with adenocarcinoma, lymphoma, or neuroendocrine tumors of the colon and rectum.
Results
Nineteen patients (2.3%) underwent abdominal surgery to treat CD-associated CRC. The mean duration of CD in the CD-associated CRC group was significantly longer than that in the benign CD group (124.7 ± 77.7 months vs. 68.9 ± 60.2 months, P = 0.006). The CD-associated CRC group included a higher proportion of patients with a history of perianal disease (73.7% vs. 50.2%, P = 0.035) and colonic location (47.4% vs. 6.5%, P = 0.001). Among 19 CD-associated CRC patients, 17 (89.5%) were diagnosed with adenocarcinoma, and of the 17 cases, 15 (88.2%) were rectal adenocarcinoma. On multivariable analyses for developing CRC, only colonic location was a risk factor (relative risk, 7.735; 95% confidence interval, 2.862–20.903; P = 0.001).
Conclusion
Colorectal malignancy is rare among CD patients, even among patients who undergo abdominal surgery. Rectal adenocarcinoma accounted for most of the CRC, and colonic location was a risk factor for developing CRC.

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Cancer Medicine.2023; 12(8): 10091. CrossRef
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Pretreatment inflammatory markers predicting treatment outcomes in colorectal cancer
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