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Erschienen in:
01.03.2015 | Original Article
A minimum yield of twelve lymph nodes in rectal cancer remains valid in the era of neo-adjuvant treatment
Results from a national cohort study
Erschienen in: International Journal of Colorectal Disease | Ausgabe 3/2015
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Purpose
The purpose of the study was to examine if a minimum of 12 lymph nodes (LNs) is still valid in rectal cancer after neo-adjuvant treatment.
Methods
An analysis was carried out in a nationwide Danish cohort of 6793 patients, treated by curative resection of stage I–III rectal cancer during the period 2003–2011. The cohort was divided into two groups according to whether neo-adjuvant treatment had been given. The groups were analysed separately and were further analysed according to four lymph node yield (LNY) groups 0–5, 6–11, 12–17 and ≥18.
Results
Two thousand one hundred twenty-three patients (31.0 %) received neo-adjuvant treatment. A median LNY of 10 and 15 (p < 0.0001) and rates of node-positive (N-positive) disease of 31.6 and 36.7 % (p < 0.001) were observed with and without (+/−) neo-adjuvant treatment, respectively. The rate of N-positive disease according to tumour stage ranged from 4.8 %/11.4 % (ypT0/pT1) to 42.1 %/64.1 % (ypT4/pT4). The rate of N-positive disease according to LNY ranged from 19.5 %/16.8 % (0–5 LNs) to 42.6 %/37.9 % (≥18 LNs) (−/+neo-adjuvant treatment). In a logistic regression analysis, a significant association was found between N-positive disease and pT/ypT stage as well as between N-positive disease and LNY.
Conclusions
A significantly smaller ratio of N-positive disease was observed in the group of patients who had received neo-adjuvant treatment. The ratio of N-positive disease increased significantly with more advanced tumour stage and increasing LNY irrespective of neo-adjuvant treatment. A minimum of 12 LNs is needed to ensure N-negative disease, irrespective of neo-adjuvant treatment.