{"entity":{"id":"ajcc-version-9","kind":"term","name":"AJCC Version 9 staging","aka":["AJCC Version 9","AJCC v9","AJCC 9th","Version 9 protocol"],"tldr":"The American Joint Committee on Cancer now updates its staging one cancer at a time as Version 9 protocols, so a report may use the 8th edition for one cancer and Version 9 for another.","summary":"The AJCC moved from printed editions to versions. Its 2026 table of the current staging system lists which of the 8th edition's chapters have been replaced by a Version 9 protocol and when: appendix carcinoma, anus and brain and spinal cord (2023); the six neuroendocrine tumour sites (stomach, duodenum and ampulla, jejunum and ileum, appendix, colon and rectum, pancreas) and vulva (2024); nasopharynx, thymus, lung and diffuse pleural mesothelioma (2025); salivary glands and HPV-associated oropharynx (2026); and cervix uteri (2021). Every other site still uses its 8th edition chapter.","asOf":"2026-11-04","links":[{"label":"American College of Surgeons, AJCC Current Staging System 2026 (which chapters are 8th edition and which Version 9)","url":"https://www.facs.org/media/c5ik5tkr/ajcc-current-staging-system-2026.pdf"},{"label":"American College of Surgeons, AJCC Version 9 cancer staging systems","url":"https://www.facs.org/quality-programs/cancer-programs/american-joint-committee-on-cancer/version-9/"}],"tags":[],"related":["ajcc-stage","tnm-staging","staging-systems","tnm-9-lung-cancer"],"cancers":[],"sections":[],"technologies":[],"targets":[],"drugs":[],"companies":[],"institutions":[],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"category":"Clinical"},"route":"/terms/ajcc-version-9/","neighbours":{"term":[{"id":"ajcc-stage","kind":"term","name":"AJCC stage (TNM staging manual)","route":"/terms/ajcc-stage/"},{"id":"anus-staging","kind":"term","name":"Anal cancer staging (AJCC chapter 21)","route":"/terms/anus-staging/"},{"id":"staging-systems","kind":"term","name":"Disease-specific staging and risk systems (FIGO, Ann Arbor, IPI, R-ISS, ELN, IMDC)","route":"/terms/staging-systems/"},{"id":"figo-2021-vulva","kind":"term","name":"FIGO 2021 staging of vulvar cancer","route":"/terms/figo-2021-vulva/"},{"id":"hpv-oropharynx-staging","kind":"term","name":"HPV-associated oropharyngeal cancer staging (AJCC chapter 10)","route":"/terms/hpv-oropharynx-staging/"},{"id":"nasopharynx-staging","kind":"term","name":"Nasopharyngeal cancer staging (AJCC chapter 9)","route":"/terms/nasopharynx-staging/"},{"id":"net-pancreas-staging","kind":"term","name":"Pancreatic neuroendocrine tumour staging (AJCC chapter 34)","route":"/terms/net-pancreas-staging/"},{"id":"pleural-mesothelioma-staging","kind":"term","name":"Pleural mesothelioma staging (AJCC chapter 37)","route":"/terms/pleural-mesothelioma-staging/"},{"id":"thymus-staging","kind":"term","name":"Thymic tumour staging (Masaoka-Koga and AJCC chapter 35)","route":"/terms/thymus-staging/"},{"id":"tnm-9-lung-cancer","kind":"term","name":"TNM 9: what changed in lung cancer staging","route":"/terms/tnm-9-lung-cancer/"},{"id":"tnm-staging","kind":"term","name":"TNM staging","route":"/terms/tnm-staging/"}]}}