Proposed modification of the eighth edition of the AJCC staging system for intrahepatic cholangiocarcinoma

Xu Feng Zhang, Feng Xue, Jin He, Sorin Alexandrescu, Hugo P. Marques, Luca Aldrighetti, Shishir K. Maithel, Carlo Pulitano, Todd W. Bauer, Feng Shen, George A. Poultsides, Oliver Soubrane, Guillaume Martel, Bas G. Koerkamp, Endo Itaru, Yi Lv, Timothy M. Pawlik*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Background: To improve the prognostic accuracy of the 8th edition of the American Joint Committee on Cancer (AJCC) staging system for intrahepatic cholangiocarcinoma (ICC) with establishment and validation of a modified TNM (mTNM) staging system. Methods: Data on patients who underwent curative-intent resection for ICC was collected from 15 high-volume centers worldwide (n = 643). An external validation dataset was obtained from the SEER registry (n = 797). The mTNM staging system was proposed by redefining T categories, and incorporating the recently proposed N status as N0 (no lymph node metastasis [LNM]), N1 (1–2 LNM) and N2 (≥3 LNM). Results: The 8th AJCC TNM staging system failed to stratify overall survival (OS) of stage II versus IIIA, stage IIIB versus IV, as well as overall stage III versus IV among all patients from the two databases, as well as stage I versus II, and stage III versus III among patients who had ≥6 LNs examined. There was a monotonic decrement in survival based on the proposed mTNM staging classification among patients derived from both the multi-institutional (Median OS, stage I 69.8 vs. II 37.1 vs. III 18.9 vs. IV 16.4 months, all p < 0.05), and SEER (Median OS, stage I 87.0 vs. II 29.3 vs. III 17.7 vs. IV 14.2 months, all p < 0.05) datasets, which was also verified among patients who had ≥6 lymph node harvested from both databases. Conclusion: The modified TNM staging system for ICC using the new T and N definitions provided an improved means to stratify patients relative to long-term OS versus the 8th AJCC staging.

Original languageEnglish
Pages (from-to)1456-1466
Number of pages11
JournalHPB
Volume23
Issue number9
DOIs
Publication statusPublished - 1 Sep 2021

Bibliographical note

Funding Information:
Xu-Feng Zhang was supported by the Clinical Research Award of the First Affiliated Hospital of Xi'an Jiaotong University of China (No. XJTU1AF-CRF-2017-004 ).

Publisher Copyright:
© 2021 International Hepato-Pancreato-Biliary Association Inc.

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