Abstract
Background
Prognosis assessment of node-positive colorectal cancer patients by Astler-Coller (AC) and TNM classifications is suboptimal. Recently, several versions of lymph node ratio (LNR; ratio metastatic/examined nodes) have been proposed but are still mostly unused.
Methods
The prognostic value of several criteria, including LNR (two classes—LNR1 and LNR2—identified by a 15 % cut-off) was studied in 761 consecutive patients, from 2000 through 2010. The relationships between total examined nodes, N, T and LNR were also analysed. LNR1 and LNR2 patients’ survival was analysed within AC and TNM subgroups, and then coupled with them.
Results
Age, tumour location and LNR are independent factors predicting survival. The relationships between LNR, N stage and T stage with examined nodes suggest confusing factors. LNR allows for identification of subgroups with different survival within AC and TNM classifications (p < 0.0001). Patients with LNR class discordant from AC stage (LNR1-C2 and LNR2-C1) have a similar 5-year survival (54 and 57 %, respectively). LNR2 and TNM stage IIIC define a poor 5-year prognosis (33 %).
Conclusions
LNR is a powerful prognosis predictor, easily integrated with TNM and AC classifications to improve prognosis assessment and facilitate clinical use. Possible confusing factors should be considered in future studies.
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Acknowledgments
The authors thank Dr. Luca Ampollini (Clinica di Chirurgia Toracica, Dipartimento di Scienze Chirurgiche, Università degli Studi di Parma), Dr. Francesco Bozzani (Registro Tumori, Unità Operativa di Oncologia Medica, Azienda Ospedaliero-Universitaria di Parma), Dr. Pier Luigi Losardo (Servizio di Radioterapia, Dipartimento Onco-Ematologico Internistico, Azienda Ospedaliero-Universitaria di Parma) and Dr. Caterina Ghetti (Servizio di Fisica Sanitaria, Azienda Ospedaliera di Parma) for their precious contribution.
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Costi, R., Beggi, F., Reggiani, V. et al. Lymph Node Ratio Improves TNM and Astler-Coller’s Assessment of Colorectal Cancer Prognosis: an Analysis of 761 Node Positive Cases. J Gastrointest Surg 18, 1824–1836 (2014). https://doi.org/10.1007/s11605-014-2591-4
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DOI: https://doi.org/10.1007/s11605-014-2591-4