Abstract
Background
Primary tumor resection (PTR) before commencing systemic chemotherapy in patients with stage IV colorectal cancer and unresectable metastases (mCRC) remains controversial. This study aimed to assess whether PTR before systemic chemotherapy is associated with mortality in mCRC patients, after adjusting for confounding factors, such as the severity of the primary tumor and metastatic lesions.
Methods
We analyzed hospital-based cancer registries from nine designated cancer hospitals in Fukushima Prefecture, Japan. Patients were divided into two groups (PTR and non-PTR), based on whether PTR was performed as initial therapy for mCRC or not. The primary outcome was all-cause mortality. Kaplan–Meier survival analysis was performed, and survival estimates were compared using the log-rank test. Adjusted hazard ratios were calculated using Cox regression to adjust for confounding factors. All tests were two-sided; P-values < 0.05 were considered statistically significant.
Results
Between 2008 and 2015, 616 mCRC patients were included (PTR: 414 [67.2%]; non-PTR: 202 [32.8%]). The median follow-up time was 18.0 (interquartile range [IQR]: 8.4–29.7) months, and 492 patients (79.9%) died during the study period. Median overall survival in the PTR and non-PTR groups was 23.9 (IQR: 12.2–39.9) and 12.3 (IQR: 6.2–23.8) months, respectively (P < 0.001, log-rank test). PTR was significantly associated with improved overall survival (adjusted hazard ratio: 0.51; 95% confidence interval: 0.42–0.64, P < 0.001).
Conclusions
PTR before systemic chemotherapy in patients with mCRC was associated with improved survival.
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Acknowledgements
We would like to express our gratitude to Seria Sato, Koji Uehara, Nobuko Kanno, Mika Yusa, Kazuhira Saito, Tomoko Oya, Yosinobu Yamazaki, Yoko Endo, Chieko Tairako, Yumi Inaba for their contribution to data collection.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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The study was conducted in accordance with the Declaration of Helsinki and relevant local laws and regulations. The study protocol was approved by the institutional review board of all participating hospitals (UMIN000033718).
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The institutional review board waived the requirement for informed consent in accordance with the Japanese government’s Ethical Guidelines for Medical and Health Research Involving Human Subjects, which allow for the opt-out approach.
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Kawamura, H., Ogawa, Y., Yamazaki, H. et al. Impact of Primary Tumor Resection on Mortality in Patients with Stage IV Colorectal Cancer with Unresectable Metastases: A Multicenter Retrospective Cohort Study. World J Surg 45, 3230–3239 (2021). https://doi.org/10.1007/s00268-021-06233-x
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DOI: https://doi.org/10.1007/s00268-021-06233-x