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Postoperative chemotherapy is associated with prognosis of stage IV colorectal cancer treated with preoperative chemotherapy/chemoradiotherapy and curative resection

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Purpose

Advances in systemic chemotherapy have increased the resectability in colorectal cancer (CRC) associated with metastases even if it was initially unresectable. However, what determines the prognosis of stage IV CRC patients treated by preoperative therapy and surgery remains unclear. We attempted to identify prognostic factors in such CRC patients.

Methods

We reviewed stage IV CRC patients who underwent curative resection between December 2007 and May 2019. The patients who underwent conversion chemotherapy for initially unresectable disease and those who received neoadjuvant chemotherapy (NAC) for resectable synchronous metastases or neoadjuvant chemoradiotherapy (NACRT) for advanced lower rectal cancer with resectable metastases were included. Recurrence-free survival (RFS) and overall survival (OS) were examined by multivariate analyses using Cox proportional hazard models. The RFS and OS curves were analyzed according to postoperative adjuvant chemotherapy (AC).

Results

Among 70 patients who underwent curative surgery (34 men, mean age: 60 years old), 33 had initially unresectable disease, 23 received NAC, and 14 NACRT. By multivariate analyses, AC was an independent predictor for improved RFS and OS (hazard ratio = 0.29, p = 0.0002, and hazard ratio = 0.37, p = 0.025). Patients treated with AC showed improved RFS and OS than those without AC (2-year RFS rate = 30% vs 19%, p = 0.031, and 3-year OS rate = 87% vs 67%, p = 0.045).

Conclusion

Because of its association with improved prognosis, AC should be considered for stage IV CRC patients after curative resection regardless of initial resectability status and preoperative therapy.

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Funding

This work was supported by Grants-in-Aid for Scientific Research (C: grant number; 17 K10620, C: grant number;17 K10621, C: grant number; 18 K07194, C: grant number; 19 K09114, and C: grant number; 19 K09115) from the Japan Society for the Promotion of Science, and by the Project for Cancer Research and Therapeutic Evolution (P-CREATE, grant number: JP19cm0106502) from the Japan Agency for Medical Research and Development (AMED).

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Correspondence to Hiroaki Nozawa.

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Nozawa, H., Sonoda, H., Ishii, H. et al. Postoperative chemotherapy is associated with prognosis of stage IV colorectal cancer treated with preoperative chemotherapy/chemoradiotherapy and curative resection. Int J Colorectal Dis 35, 177–180 (2020). https://doi.org/10.1007/s00384-019-03461-5

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