Abstract
Purpose
This study aimed to clarify predictors and therapeutic significance of inguinal lymph node metastasis (ILNM) in patients with rectal cancer.
Methods
Patients with rectal adenocarcinoma invading the anal canal who underwent curative surgery between 2003 and 2019 were retrospectively reviewed. Synchronous and metachronous lymph node (LN) metastasis were collectively defined as final nodal metastasis (f-LNM). Factors associated with f-LNM were analyzed. Moreover, the “modified therapeutic value index,” defined by multiplication of the frequency of f-LNM by the 5-year overall survival rate for patients who received treatment for f-LNM, was calculated for each LN area.
Results
A total of 145 patients were enrolled (16 patients with f-ILNM). To predict f-ILNM, the cutoff of the inguinal lymph node (ILN) diameter of 8.5 mm gave an area under the curve of 0.889. Dentate line involvement (odds ratio 33.4) and ILN larger than the cutoff of 8 mm (odds ratio 11.9) were independently associated with f-ILNM. The modified therapeutic value indices of the inguinal, lateral pelvic, and mesorectal LNs in the entire population were 6.1, 8.2, and 20.3 points, respectively. In patients with dentate line invasion by cancer, the index of the ILN increased to 11.7 points. In patients with an ILN > 8 mm, the index further increased to 21.1 points.
Conclusion
Dentate line involvement and ILN > 8 mm predicted the development of ILNM in patients with rectal cancer invading the anal canal. Treatment of the ILN should be considered for patients with the above predictors given the significant therapeutic outcomes.
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Funding
This research is supported by Grants-in-Aid for Scientific Research (C: grant number; 17K10620, C: grant number; 17K 10621, C: grant number; 17K10623, C: grant number; 18K07194, C: grant number; 19K09114, C: grant number; 19K09115) from Japan Society for the promotion of Science. This research is supported by the Project for Cancer Research and Therapeutic Evolution (P-CREATE), grant number: JP 19cm0106502 from the Japan Agency for Medical Research and Development (AMED).
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H. Shiratori and H. Nozawa designed the study and wrote the initial draft of the manuscript, and K. Kawai, K. Hata, T. Tanaka, M. Kaneko, S. Emoto, H. Sonoda, and S. Ishihara revised it critically for important intellectual content. All the authors contributed to data collection, analysis, and interpretation of data and assisted in the preparation of the manuscript. All the authors agreed accountable for all aspects of the work and approved the final version to be published.
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This study was conducted following approval by the ethics committee of the University of Tokyo Hospital (No. 3252-(8)).
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Shiratori, H., Nozawa, H., Kawai, K. et al. Risk factors and therapeutic significance of inguinal lymph node metastasis in advanced lower rectal cancer. Int J Colorectal Dis 35, 655–664 (2020). https://doi.org/10.1007/s00384-020-03520-2
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DOI: https://doi.org/10.1007/s00384-020-03520-2