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Lymph Node Positivity in T1/T2 Rectal Cancer: a Word of Caution in an Era of Increased Incidence and Changing Biology for Rectal Cancer

  • Original Article
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Journal of Gastrointestinal Surgery Aims and scope

Abstract

Background

The evaluation of lymph nodes in rectal cancer dictates treatment. The goals of this study are to characterize the contemporary rate of lymph node metastasis in early stage rectal cancer and to re-investigate histologic factors that predict positive lymph nodes.

Materials and Methods

Using the National Cancer Database, we identified patients with clinical stage I rectal adenocarcinoma. Multivariable logistic regression was used to determine risk factors for lymph node positivity.

Results

12.2% of patients with T1 tumors and 18.0% of patients with T2 tumors had positive lymph nodes. For T1 tumors, positive lymph nodes were present in 9.3% with neither poor differentiation nor lymphovascular invasion (LVI), 17.3% with poor differentiation alone, 34.7% with LVI alone, and 45.0% with both poor differentiation and LVI. For T2 tumors, positive lymph nodes were present in 11.7% with neither poor differentiation nor LVI, 25.3% with poor differentiation alone, 47.3% with LVI alone, and 41.5% with both poor differentiation and LVI. LVI was an independent predictor of positive lymph nodes (OR;4.75,95%CI;3.17–7.11,p < 0.001) for T1 and (OR;6.20,95%CI;4.53–8.51,p < 0.001) T2 tumors.

Conclusions

T1/T2 tumors have higher rates of positive lymph nodes when poor differentiation and LVI are present. These results should be taken into consideration prior to surgical treatment.

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All authors had substantial contributions to design of work, drafted work, made final approval, and agreed to be accountable for all aspects of the work.

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Correspondence to Adam C. Fields or Joel E. Goldberg.

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The authors declare that they have no conflict of interest.

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The study was reviewed and approved by the Institutional Review Board.

This work was presented as a podium presentation at the American College of Surgeons Clinical Congress, Oct 21-25 2018, Boston, Massachusetts.

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Fields, A.C., Lu, P., Hu, F. et al. Lymph Node Positivity in T1/T2 Rectal Cancer: a Word of Caution in an Era of Increased Incidence and Changing Biology for Rectal Cancer. J Gastrointest Surg 25, 1029–1035 (2021). https://doi.org/10.1007/s11605-020-04580-z

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