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Recent Advances in Digestive Tract Tumors: Updates From the 5th Edition of the World Health Organization "Blue Book"
Raul S Gonzalez1, Anwar Raza2, Robert Propst2
1The Department of Pathology, Beth Israel Deaconess Medical Center, Boston, Massachusetts (Gonzalez).
Context.—:
The World Health Organization Classification of Tumours: Digestive System Tumors, 5th edition, was published in 2019 and shows several impactful changes as compared with the 4th edition published in 2010. Changes include a revised nomenclature of serrated lesions and revamping the classification of neuroendocrine neoplasms. Appendiceal goblet cell adenocarcinoma is heavily revised, and intrahepatic cholangiocarcinoma is split into 2 subtypes. New subtypes of colorectal carcinoma and hepatocellular carcinoma are described. Precursor lesions are emphasized with their own entries, and both dysplastic and invasive lesions are generally recommended to be graded using a 2-tier system. Hematolymphoid tumors, mesenchymal tumors, and genetic tumor syndromes each have their own sections in the 5th edition. New hematolymphoid lesions include monomorphic epitheliotropic intestinal T-cell lymphoma; duodenal-type follicular lymphoma; intestinal T-cell lymphoma, not otherwise specified; and indolent T-cell lymphoproliferative disorder of the gastrointestinal tract. This paper will provide an in-depth look at the changes in the 5th edition as compared with the 4th edition.
Objective.—:
To provide a comprehensive, in-depth update on the World Health Organization classification of digestive tumors, including changes to nomenclature, updated diagnostic criteria, and newly described entities.
Data Sources.—:
The 5th edition of the World Health Organization Classification of Tumours: Digestive System Tumours, as well as the 4th edition.
Conclusions.—:
The World Health Organization has made many key changes in its newest update on tumors of the digestive system. Pathologists should be aware of these changes and incorporate them into their practice as able or necessary.
Insights
The 2019 World Health Organization classification of digestive tumors introduces significant updates, including revised nomenclature for serrated lesions and new classifications for neuroendocrine neoplasms. Pathologists must adapt to these changes for accurate diagnosis and patient care.
Area of Science:
- Gastroenterology
- Oncology
- Pathology
Background:
- The 4th edition of the World Health Organization Classification of Tumours: Digestive System Tumours was published in 2010.
- The 5th edition, published in 2019, introduces substantial revisions.
- These revisions impact the classification and nomenclature of various digestive system tumors.
Purpose of the Study:
- To provide a comprehensive update on the 5th edition of the World Health Organization Classification of Tumours: Digestive System Tumours.
- To detail changes in nomenclature, diagnostic criteria, and newly described entities.
- To compare the 5th edition with the 4th edition.
Main Methods:
- Comparative analysis of the 4th (2010) and 5th (2019) editions of the World Health Organization Classification of Tumours: Digestive System Tumours.
- Review of updated nomenclature, diagnostic criteria, and newly described tumor entities.
- Focus on key changes in classification for specific tumor types.
Main Results:
- Revised nomenclature for serrated lesions and neuroendocrine neoplasms.
- Appendiceal goblet cell adenocarcinoma classification is heavily revised.
- Intrahepatic cholangiocarcinoma is now split into 2 subtypes.
- New subtypes of colorectal and hepatocellular carcinoma are described.
- Emphasis on precursor lesions with dedicated entries.
- Introduction of a 2-tier grading system for dysplastic and invasive lesions.
- New sections for hematolymphoid tumors, mesenchymal tumors, and genetic tumor syndromes.
- Inclusion of new hematolymphoid lesions such as monomorphic epitheliotropic intestinal T-cell lymphoma.
Conclusions:
- The 5th edition of the World Health Organization Classification of Tumours: Digestive System Tumours presents significant changes from the 4th edition.
- Pathologists need to be aware of and incorporate these updates into their clinical practice.
- These revisions aim to improve diagnostic accuracy and classification of digestive system tumors.
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