In Situ Neoplasia – AJCC Cancer Staging Manual 8th Edition

​AJCC is announcing a change in staging rules for the AJCC Cancer Staging Manual, Eighth Edition effective with cases diagnosed on or after January 1, 2018, in the assignment of the T category for in situ neoplasia, carcinoma in situ and melanoma in situ.

Starting with the 8th Edition in 2018, the clinical T category will now be cTis. 

  • This rule change for the 8th Edition does not affect cases staged with previous editions prior to 2018.

  • Starting in 2018 for the 8th Edition, other valid T and N categories with the appropriate c and p prefix will be introduced based on 8th Edition rules.