Annals of Coloproctology

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Applications of propensity score matching: a case series of articles published in Annals of Coloproctology: Hwa Jung Kim; Ann Coloproctol. 2022;38(6):398-402. Published online December 28, 2022; DOI: https://doi.org/10.3393/ac.2022.01060.0151

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Propensity score matching (PSM) is an increasingly applied method of ensuring comparability between groups of interest. However, PSM is often applied unconditionally, without precise considerations. The purpose of this study is to provide a nonmathematical guide for clinicians at the stage of designing a PSM-based study. We provide a seed of thought for considering whether applying PSM would be appropriate and, if so, the scope of the list of variables. Although PSM may be simple, its results could vary substantially according to how the propensity score is constructed. Misleading results can be avoided through a critical review of the process of PSM.

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An analysis of exogenous harmful substance exposure as risk factors for COPD and hypertension co-morbidity using PSM
Qingyang Chen, Haodong Zhou, Jiarong Tang, Yingbiao Sun, Geriletu Ao, Hongjun Zhao, Xuhong Chang
Frontiers in Public Health.2024;[Epub] CrossRef
Impact of Postoperative Naples Prognostic Score to Predict Survival in Patients with Stage II–III Colorectal Cancer
Su Hyeong Park, Hye Seung Woo, In Kyung Hong, Eun Jung Park
Cancers.2023; 15(20): 5098. CrossRef

Original Article

Malignant disease, Rectal cancer,Prognosis and adjuvant therapy,Colorectal cancer

The Impact of Primary Tumor Resection on Survival in Asymptomatic Colorectal Cancer Patients With Unresectable Metastases: Ki Yoon Doah, Ui Sup Shin, Byong Ho Jeon, Sang Sik Cho, Sun Mi Moon; Ann Coloproctol. 2021;37(2):94-100. Published online April 30, 2021; DOI: https://doi.org/10.3393/ac.2020.09.15.1

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17 Citations

Abstract PDF

Purpose
This study was conducted to evaluate the effectiveness of primary tumor resection (PTR) in asymptomatic colorectal cancer (CRC) patients with unresectable metastases using the inverse probability of treatment weighting (IPTW) method to minimize selection bias.
Methods
We selected 146 patients diagnosed with stage IV CRC with unresectable metastasis between 2001 and 2018 from our institutional database. In a multivariate logistic regression model using the patients’ baseline covariates associated with PTR, we applied the IPTW method based on a propensity score and performed a weighted Cox proportional regression analysis to estimate survival according to PTR.
Results
Upfront PTR was performed in 98 patients, and no significant differences in baseline factors were detected. The upweighted median survival of the PTR group was 18 months and that of the non-PTR group was 15 months (P = 0.15). After applying the IPTW, the PTR was still insignificant in the univariate Cox regression (hazard ratio [HR], 0.26; 95% confidence interval [CI], 0.5–1.21). However, in the multivariate weighted Cox regression with adjustment for other covariates, the PTR showed a significantly decreased risk of cancer-related death (HR, 0.61; 95% CI, 0.40–0.94).
Conclusion
In this study, we showed that asymptomatic CRC patients with unresectable metastases could gain a survival benefit from upfront PTR by analysis with the IPTW method. However, randomized controlled trials are mandatory.

Citations

Citations to this article as recorded by

A predictive model to identify optimal candidates for surgery among patients with metastatic colorectal cancer
Xiqiang Zhang, Zhaoyi Jing, Longchao Wu, Ze Tao, Dandan Lu
Frontiers in Oncology.2025;[Epub] CrossRef
Recurrence Rates and Postoperative Complications Following Colorectal Cancer Surgery: A 5-Year Study at a Tertiary Care Hospital in Peshawar
Tilal Ahmed Raza, Hussain Jan Abbasi, Farrukh Ozair, Hajra Imtiaz
Pakistan Journal of Health Sciences.2025; : 120. CrossRef
Primary tumor resection for asymptomatic colorectal cancer patients with synchronous unresectable metastases: a meta-analysis of randomized controlled trials and case-matched studies
Jun Huang, Jiahao Zhou, Ping Zhang, Qingbin Wu, Ziqiang Wang
Langenbeck's Archives of Surgery.2024;[Epub] CrossRef
Effect of primary tumor resection on survival in patients with asymptomatic unresectable metastatic colorectal cancer: a systematic review and meta-analysis
Chengren Zhang, Cong Cao, Lili Liu, Yaochun Lv, Jingjing Li, Jiyong Lu, Shuai Wang, Binbin Du, Xiongfei Yang
Expert Review of Anticancer Therapy.2023; 23(1): 107. CrossRef
The role of upfront primary tumor resection in asymptomatic patients with unresectable stage IV colorectal cancer: A systematic review and meta-analysis
Zongyu Liang, Zhiyuan Liu, Chengzhi Huang, Xin Chen, Zhaojun Zhang, Meijuan Xiang, Weixian Hu, Junjiang Wang, Xingyu Feng, Xueqing Yao
Frontiers in Surgery.2023;[Epub] CrossRef
Primary tumor resection in colorectal cancer patients with unresectable distant metastases: a minireview
Junge Bai, Ming Yang, Zheng Liu, Sergey Efetov, Cuneyt Kayaalp, Audrius Dulskas, Darcy Shaw, Xishan Wang
Frontiers in Oncology.2023;[Epub] CrossRef
Palliative primary tumor resection in minimally symptomatic (asymptomatic) patients with colorectal cancer and synchronous unresectable metastases versus chemotherapy alone: a metaanalysis
Iu. V. Alimova, Yu. A. Shelygin, E. G. Rybakov, M. V. Alekseev
Koloproktologia.2023; 22(2): 126. CrossRef
The impact of primary tumor resection for asymptomatic colorectal cancer patients with unresectable metastases: a systematic review and meta-analysis
Shuyuan Li, Liqiang Ji, Jie Huang, Ye Wang, Peng Liu, Wei Zhang, Zheng Lou
International Journal of Colorectal Disease.2023;[Epub] CrossRef
The impact of palliative primary tumor resection on overall survival in minimally symptomatic (asymptomatic) colorectal cancer and synchronous unresectable metastases vs chemotherapy only: a comparative study of outcomes
Iu. V. Alimova, S. I. Achkasov, Yu. A. Shelygin, M. V. Alekseev, V. N. Kashnikov, M. Yu. Fedyanin, M. A. Danilov, E. G. Rybakov
Koloproktologia.2023; 22(4): 10. 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
Palliative primary tumor resection in minimally symptomatic patients with colorectal cancer and synchronous unresectable metastases: when is it necessary? (systematic review)
Iu. V. Alimova, Yu. A. Shelygin, E. G. Rybakov
Koloproktologia.2022; 21(3): 99. CrossRef
Surgical treatment for metastatic colorectal cancer
Eun Jung Park, Seung Hyuk Baik
Journal of the Korean Medical Association.2022; 65(9): 568. CrossRef
Recent Advance in the Surgical Treatment of Metastatic Colorectal Cancer-An English Version
Eun Jung Park, Seung Hyuk Baik
Journal of the Anus, Rectum and Colon.2022; 6(4): 213. CrossRef
Molecular analyses of peritoneal metastasis from colorectal cancer
Chang Hyun Kim
Journal of the Korean Medical Association.2022; 65(9): 586. CrossRef
Molecular Analyses in Peritoneal Metastasis from Colorectal Cancer: A Review-An English Version
Chang Hyun Kim
Journal of the Anus, Rectum and Colon.2022; 6(4): 197. CrossRef
Primary Tumor Resection in Asymptomatic Colorectal Cancer Patients With Unresectable Metastases: Can It Improve Survival?
Myong Hoon Ihn
Annals of Coloproctology.2021; 37(2): 71. CrossRef
Treatment for Peritoneal Metastasis of Patients With Colorectal Cancer
Young Jin Kim, Chang Hyun Kim
Annals of Coloproctology.2021; 37(6): 425. CrossRef

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