The Solid Tumor Rules have been updated based on 5th Ed WHO Classification of Tumors books, College of American Pathologist Cancer Committee, and review of questions and feedback from registrars. Most changes are minor: new terminology, additional definitions, notes, and examples.
Important changes to reportable neoplasms in colorectal sites has been added to the colon rules. In order to simplify histology coding instructions, a histology rule was added to address these neoplasms. These updates do not require review of already abstracted cases. We strongly recommend you read the September 2021 Change Log to understand what changes were made.
The September 2021 Update includes changes that apply to cases diagnosed January 1, 2022 and after. The editors recommend that until these changes are implemented, registrars continue using the current Solid Tumor Rules, updated December 2020, for cases diagnosed from January 1, 2018 through 12/31/2021.
The updated Solid Tumor Rules may be accessed at: https://seer.cancer.gov/tools/solidtumor/
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