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The significance of extramural venous invasion in R1 positive rectal cancer

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Abstract

Background and aims

Evidence has shown that a positive resection margin (R1) is a key determinant of subsequent local recurrence and a poor prognostic factor in rectal cancer. The aim of this study was to evaluate the outcomes and prognosticators in patients with R1 resection of rectal cancer.

Material and methods

Retrospective study of all patients operatively managed within our institution between April 2008 and April 2013 for rectal cancer. Baseline demographics and multiple outcome measures recorded. Overall survival (OS), disease-free survival (DFS) and recurrence were the primary outcome measures.

Results

Overall, there were 306 primary rectal cancers. Seventy-six percent were grade T3/4 tumours. OS was 30 months. R1 rate was 16 % (48 patients). Thirty-one patients underwent APR and 17 AR. In patients who responded to neoadjuvant chemotherapy (NAC), overall survival was 55 months, with no extramural venous invasion (EMV) seen in this cohort. In non-responders OS was 29 months, with EMV in 48 %. In patients who did not receive NAC, OS was 23 months, with EMV in 74 %. EMV is a strong predictor for poor survival following R1 (p = 0.001). We also found a correlation between number of positive nodes and OS/DFS (p = 0.004).

Conclusions

In this small cohort of patients with R1 positive rectal cancers, response to NAC is the strongest predictor of poor overall and disease-free survival. In patients who respond to NAC, OS and DFS has been shown to be positive, with a reduced rate of EMV.

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Correspondence to N. M. Ormsby.

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We have read and understood the IJCD policy on declaration of interests and declare that we have no competing interests.

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Ormsby, N.M., Bermingham, H.N., Joshi, H.M. et al. The significance of extramural venous invasion in R1 positive rectal cancer. Int J Colorectal Dis 32, 119–124 (2017). https://doi.org/10.1007/s00384-016-2658-7

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  • DOI: https://doi.org/10.1007/s00384-016-2658-7

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