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, 2017, in the assignment of the T category for in situ
neoplasia, carcinoma in situ and melanoma in situ.
Starting with the 8th edition in 2017, 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
- Starting in 2017 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.