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, 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 2017. 
  • 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.