Solid Tumor Rules
Summary: The Solid Tumor Rules 2026.1 manual provides standardized guidelines for cancer registrars to determine the number of primaries and code histology for solid tumors, excluding lymphoma and leukemia.
The Solid Tumor Rules 2026.1 manual is the definitive reference for cancer registrars to ensure consistent data collection. It covers 10 specific site-groups, including Breast, Colon, Lung, Kidney, Head and Neck, CNS, Urinary, Melanoma, and Other Sites. The manual provides detailed instructions on multiple primary rules, histology coding, and the use of ambiguous terminology. This 2026.1 update incorporates alignment with Cancer PathCHART tumor site-morphology standards and reflects current clinical practices from the World Health Organization and CAP. It is intended for use with cases diagnosed from 2018 onwards, with specific site-group exceptions noted.
Document outline
1. General Instructions 2. Preface 3. Diagnosis Years for Site-groups 4. Purpose and Structure of the Solid Tumor Rules 5. Multiple Primary Rules 6. Timing Rules for Metachronous Tumors 7. Histology Rules 8. Ambiguous Terms to Code Histology 9. Definitions 10. Site-group Sections (Breast, Colon/Rectum, Head and Neck, Kidney, Lung, Malignant CNS, Non-malignant CNS, Urinary, Melanoma, Other Sites)