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01.12.2012 | Research | Ausgabe 1/2012 Open Access

World Journal of Surgical Oncology 1/2012

Assessment of lymph node status in gallbladder cancer: location, number, or ratio of positive nodes

Zeitschrift:
World Journal of Surgical Oncology > Ausgabe 1/2012
Autoren:
Yoshio Shirai, Jun Sakata, Toshifumi Wakai, Taku Ohashi, Yoichi Ajioka, Katsuyoshi Hatakeyama
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1477-7819-10-87) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

YS conceived the study and drafted the manuscript. JS helped to draft the manuscript and performed statistical analyses. TW performed chart review and follow-up of the study cohort. TO helped with chart review and patient follow-up. YA provided histological data. KH was responsible for the whole study and participated in its coordination. All authors read and approved the final manuscript.

Abstract

Background

Assessment of lymph node status is a critical issue in the surgical management of gallbladder cancer. The aim of this study was to compare the anatomical location of positive nodes, number of positive nodes, and lymph node ratio (LNR) as prognostic predictors in gallbladder cancer.

Methods

We conducted a retrospective analysis of 135 patients with gallbladder cancer who underwent a radical resection with regional lymphadenectomy. A total of 2,245 regional lymph nodes were retrieved (median, 14 per patient). The location of positive nodes was classified according to the AJCC staging manual (7th edition). ‘Optimal’ cutoff values were determined for the number of positive nodes and LNR based on maximal χ2 scores calculated with the Cox proportional hazards regression model.

Results

Lymph node metastasis was found histologically in 59 (44%) patients. The ‘optimal’ cutoff values for the number of positive nodes and LNR were determined to be three nodes and 10%, respectively. Univariate analysis identified location of positive nodes (pN0, pN1, pN2; P < 0.001), number of positive nodes (0, 1 to 3, ≥4; P < 0.001), and LNR (0%, 0 to 10%, >10%; P < 0.001) as significant prognostic factors. Multivariate analysis identified number of positive nodes as an independent prognostic factor ( P = 0.004); however, location of positive nodes and LNR failed to remain as an independent variable.

Conclusions

The number of positive lymph nodes better predicts patient outcome after resection than either the location of positive lymph nodes or LNR in gallbladder cancer. Dividing the number of positive lymph nodes into three categories (0, 1 to 3, or ≥4) is valid for stratifying patients based on the prognosis after resection.
Zusatzmaterial
Authors’ original file for figure 1
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Authors’ original file for figure 2
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Authors’ original file for figure 3
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Authors’ original file for figure 4
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Literatur
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