New Japanese Classification of Pancreatic Cancer
Background: The Japanese classification of pancreatic cancer, seventh edition, has been released by Japan Pancreas Society (JPS) in July 2016.
Methods: Revision concepts and major revision points of the seventh edition of Japanese classification of the pancreatic cancers were reviewed.
Definition of the parts of the pancreas.
T category and stage grouping: consistency with those of the UICC seventh edition was obtained.
Reappraisal of anatomy of extrapancreatic nerve plexuses.
N category: classification based on numbers of lymph nodal metastasis among the regional lymph nodes; N1a, metastasis in one to three regional lymph nodes; and N1b, metastasis in four or more regional lymph nodes.
Histopathological classification which is consistent with the WHO classification.
The following new items have been added: (1) diagnostic guideline of tumor extension and lymph node metastasis based on multidetector CT (MD-CT), (2) objective criteria defining resectability status only based on the findings of MD-CT, (3) cytopathology guideline, and (4) criteria of histological response to drug therapy and/or radiotherapy.
Conclusion: The revised seventh edition of JPS pancreatic cancer classification focuses on establishing consistency to UICC seventh edition, while originality of JPS classification is maintained.
KeywordsPancreatic cancer Japanese classification Staging system UICC/AJCC staging system
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