Abstract
Background
Lymph node (LN) harvesting is associated with outcomes in colonic cancer. We sought to interrogate whether a distinctive immune milieu of the primary tumour is associated with LN yield.
Methods
A total of 926 treatment-naive patients with colorectal adenocarcinoma with more than 12 LNs (LN-high) were compared with patients with 12 or fewer LNs (LN-low). We performed immunohistochemistry and quantification on tissue microarrays for HLA class I/II proteins, beta-2-microglobulin (B2MG), CD8, CD163, LAG3, PD-L1, FoxP3, and BRAF V600E.
Results
The LN-high group was comprised of younger patients, longer resections, larger tumours, right-sided location, and tumours with deficient mismatch repair (dMMR). The tumour microenvironment showed higher CD8+ cells infiltration and B2MG expression on tumour cells in the LN-high group compared to the LN-low group. The estimated mean disease-specific survival was higher in the LN-high group than LN-low group. On multivariate analysis for prognosis, LN yield, CD8+ cells, extramural venous invasion, perineural invasion, and AJCC stage were independent prognostic factors.
Conclusion
Our findings corroborate that higher LN yield is associated with a survival benefit. LN yield is associated with an immune high microenvironment, suggesting that tumour immune milieu influences the LN yield.
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Data availability
The data that support the findings of this study are not openly available to maintain patient confidentiality, but de-identified data are available from the corresponding author upon reasonable request.
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VD is partially funded by NIH grant.
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OY and VD performed study concept and design; AP, AN, YO, and SR performed development of methodology; CF, DT, DP, OY, and DB provided acquisition of data and revision of paper; SL, OY, and VD analysed and interpreted data; SL, OY, and VD performed writing the paper. All authors reviewed and approved the final paper.
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The analyses of the cohort were conducted in adherence of the Declaration of Helsinki. The study was approved by the hospital institutional review board (IRB; MGB no. 2017P61).
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Lee, S.H., Pankaj, A., Neyaz, A. et al. Immune microenvironment and lymph node yield in colorectal cancer. Br J Cancer 129, 917–924 (2023). https://doi.org/10.1038/s41416-023-02372-1
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DOI: https://doi.org/10.1038/s41416-023-02372-1