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Outcomes of surgery without HIPEC for synchronous peritoneal metastasis from colorectal cancer: data from a multi-center registry

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Abstract

Background

Preoperative detection of small peritoneal metastases is difficult, and a convenient method is required to decide the nature of procedures subsequent to initial exploratory surgery. The aim of this study was to validate the Japanese classification of peritoneal metastasis from colorectal cancer.

Methods

This retrospective study analyzes data from a multi-center registry. Factors affecting the extent of peritoneal metastasis, macroscopic radical resection and prognosis were analyzed using data from patients with colorectal cancer and synchronous peritoneal metastasis. Peritoneal metastasis was classified depending on extent into three groups (P1–P3).

Results

Among 60,176 patients with colorectal surgery, 3,075 (5.1 %) had synchronous peritoneal metastasis. Tumor location on the right side (P < 0.0001), histological grade (P = 0.0014) and distant metastasis (P < 0.0001) were associated with the extent of peritoneal metastasis. Gender (P = 0.041), lymph node metastasis (P < 0.0001), distant metastasis (P < 0.0001), extent of peritoneal metastasis according to the present classification (P < 0.0001) and the period when the patient underwent the operation (operative period; P < 0.0001) were independently associated with macroscopic radical resection. Cox proportional hazards model disclosed that gender (P = 0.0046), tumor location (P = 0.032), age (P = 0.048), histological grade (P < 0.0001), lymph node metastasis (P < 0.0001), distant metastasis (P < 0.0001), extent of peritoneal metastasis (P < 0.0001), and macroscopic radical resection (P < 0.0001) were independent prognostic factors.

Conclusions

Macroscopic radical resection was an independent prognostic factor even without hyperthermic intraperitoneal chemotherapy. The referral of patients without distant metastasis to centers with experienced peritoneal surgeons might be a potential option if the peritoneal metastasis is unresectable in general hospitals.

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Conflict of interest

All authors declare that they have no conflict of interest in this manuscript.

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Correspondence to Hirotoshi Kobayashi.

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On behalf of the Japanese Society for Cancer of the Colon and Rectum.

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Kobayashi, H., Kotake, K. & Sugihara, K. Outcomes of surgery without HIPEC for synchronous peritoneal metastasis from colorectal cancer: data from a multi-center registry. Int J Clin Oncol 19, 98–105 (2014). https://doi.org/10.1007/s10147-012-0505-6

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  • DOI: https://doi.org/10.1007/s10147-012-0505-6

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