Multinational validation of the American Joint Committee on Cancer 8th edition pancreatic cancer staging system in a pancreas head cancer cohort

Wooil Kwon, Jin He, Ryota Higuchi, Donghee Son, Seung Yeoun Lee, Jaeri Kim, Hongbeom Kim, Sun Whe Kim, Christopher L. Wolfgang, John L. Cameron, Masakazu Yamamoto, Jin Young Jang

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The aim of the present study was to compare the 7th and 8th editions of the American Joint Committee on Cancer (AJCC) staging system for pancreas head cancer and to validate the 8th edition using three multinational tertiary center data. Methods: Data of 2,864 patients with pancreas head cancer were collected from Korea (571), Japan (824), and the USA (1,469). Survival analysis was performed to compare the 7th and 8th editions. Validation was performed by log-rank tests and test for trend repeated 1,000 times with random sets. Results: In the 7th edition, 4.1%, 3.1%, 18.6%, 67.5%, 3.6%, and 3.1% were stage IA, IB, IIA, IIB, III, and IV. In the 8th edition, 8.8%, 13.9%, 3.1%, 38.2%, 32.9%, and 3.1% were stage IA, IB, IIA, IIB, III, and IV, respectively. The change in T category downstaged 459 patients from IIA to the new IA and IB. The new N2 category upstaged 856 patients from the former IIB to III. The 7th edition reversely stratified IA and IB. The 8th edition corrected this mis-stratification of the 7th edition, but lacked discriminatory power between IB and IIA (P = 0.271). Validation using the log-rank showed that the 8th edition provided better discrimination in 6.387 test sets among 10 tests. The test for trend validated the 8th edition to stratify stages in correct order more often (7.815/10). Conclusion: The 8th edition provides more even distribution with more powerful discrimination compared to the 7th edition.

Original languageEnglish (US)
Pages (from-to)418-427
Number of pages10
JournalJournal of Hepato-Biliary-Pancreatic Sciences
Volume25
Issue number9
DOIs
StatePublished - Sep 2018

Keywords

  • American Joint Committee on Cancer
  • Multinational
  • Pancreas head cancer
  • Stage
  • Validation

ASJC Scopus subject areas

  • Medicine(all)

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