American Joint Committee on Cancer

The Importance of Staging

Evidence-based anatomic staging is the critical factor to understanding cancer and treating patients. New breakthroughs in oncologic, radiologic, pathologic, and molecular science are opening up ever-more promising possibilities for precisely defining a prognosis and recommending a treatment based on a patient's individual data.

Cancer Programs

2025 ACS Cancer Conference

Registration is now open for the 2025 ACS Cancer Conference and Workshops, March 12-14. We look forward to seeing you in Phoenix!

Cancer Programs

Version 9 Protocols and AJCC Staging Online Unveiled

November 2023

The AJCC announces two groundbreaking developments: the release of the latest Version 9 AJCC Cancer Staging Protocols and the upcoming launch of AJCC Staging Online.

ACS News

AJCC Cancer Staging Content to Appear in SNOMED CT Under New Licensing Agreement

A licensing agreement between the ACS and SNOMED International includes American Joint Committee on Cancer references in SNOMED CT.

Cancer Programs

Cancer Staging Systems

The AJCC has developed and compiled cancer staging references for quickly finding important information about different types of cancers.

Cancer Programs

Learn the Principles of Cancer Staging

AJCC Chapter 1: Principles of Cancer Staging is available as a free download. Chapter 1 provides overall rules for AJCC cancer staging that apply across all tumor sites.

Cancer Programs

FAQs and Resources

Review this document for frequently asked questions on Version 9 and the Cervix Uteri release.

Cancer Staging System Updates

8th Edition Updates and Corrections

Important updates and errata identified in the AJCC Cancer Staging Manual, 8th Edition are divided into four levels of significance:

Critical Changes. Change is critical for accurate staging. Includes changes to TNM categories, criteria, or prognostic stage groups.
Histology/Topography. Corrections and additions made to histology or topography codes.
Clarification. Clarification of concepts in text or definitions that does not affect staging.
Omission. Error of omission that does not affect staging.

Updates and Errata Spreadsheet Updated 5/13/21.
Updated 8th Edition Breast Chapter Updated 3/13/18.
Topography and Histology 8th Edition Updated 9/1/23. This is a complete list from the 8th edition plus new histologies and terms approved after publication with their effective date.

Version 9 Updates

Topography and Histology Version 9 Updated 9/1/23. This is a complete list from Version 9 plus new histologies and terms approved after publication with their effective date.

If you have identified any issues not listed here, please email ajcc@facs.org.