Intra-abdominal recurrence from colorectal carcinoma: Differences and similarities between local and peritoneal recurrence.

BACKGROUND: Peritoneal recurrences from colo-rectal cancer can be isolated (PR) or associated with local recurrences (LR). The purpose of this study was to analyze patterns and outcomes of LR and PR. METHODS: Analyze from a prospective database of 108 patients treated with CCS plus HIPEC at two cancer centers between 2008 and 2015. RESULTS: The population was divided into an LPR group (presence of LR with or without PR, n = 56) and a PR group (isolated PR, n = 52). The patients characteristics (age, sex, Charlson score, PCI) or perioperative treatments were comparable between the groups. The median number of resected organs for tumor involvement (respectively, 2 vs 1; p < 0.001), the percentage of patients with metastatic lymph nodes (LN+) from the resected specimen (respectively, 25% vs 7%; p = 0.016) and the mortality rate (respectively, 9% vs 0%; p = 0.023) were significantly higher in the LPR group. After a median follow-up of 32 (1-108) months, median overall survival was comparable between the two groups (respectively, 46 vs 42 months; p = 0.262). CONCLUSIONS: LR is associated with a higher incidence of organ invasion, LN involvement (25%) and postoperative mortality. Optimal surgical resection of LR with systematic lymphadenectomy of invaded organs seems mandatory.

Significance of lymph node involvement in local recurrence of colorectal cancer.

BACKGROUND: There are few data on lymphatic spread concomitant to local recurrence (LR) of colorectal cancer (CRC). The objectives of this study were to determine variables associated with lymphatic spread, to analyze the distribution of LN+, and understand the underlying mechanisms. METHODS: A total of 76 patients underwent resection of LR of CRC between January 2007 and December 2018 at Institut cancérologique de l'Ouest and were retrospectively reviewed. RESULTS: Twenty-five (32.9%) patients had lymph node (LN) involvement with LR. Lymphatics from the mesocolon-rectum and aorto-iliac compartments were involved in 21%, 20.3% and 18.1%, 20.3% for pelvic and retroperitoneal LRs, respectively. In multivariate analysis, the only predictive factor for LN invasion (LN+) was a primary positive LN status (odds ratio, 5.3; P = .007). Despite a trend toward a worse median overall survival in the LN+ group, the difference was not significant in comparison with the LN- group (46 vs. 57 months; P = 0.31) or with the LN- plus LN not assessed groups (46 months vs not reached; P = .07). CONCLUSIONS: LN invasion with LR from CRC is a frequent occurrence without significant impact on survival. The only predictive factor is a primary positive nodal status.