AJCC Cancer Staging System Version 9

**Semantic type:** Intellectual Product

**Definition:** The 9th version of the criteria developed by the American Joint Committee on Cancer (AJCC) and used for the classification and staging of neoplastic diseases. Version 9 updates the Cervix Uteri Cancer Staging System and became effective on January 1, 2021. It replaces the 8th Edition Cervix Uteri cancer site content. All other disease sites in the 8th Edition Cancer Staging Manual remain current for 2021. With this iteration, the AJCC has changed how it will further update and release cancer staging content; it has shifted the naming for releases from "Cancer Staging Manual Edition" to "Cancer Staging System Version".

**Synonyms:** - AJCC Cancer Staging Manual Version 9 - AJCC v9 - AJCC9