Question: 20200031

Status


Final

Category


#1:   Solid Tumor Rules (2018)
#2:   Histology
#3:   Breast


References


Source 1:   2018 Solid Tumor Rules
pgs:  
Notes:   Breast; July 2019 Update
Source 2:  
pgs:  
Notes:  


Question


Histology/Behavior--Breast: How are histology and behavior coded for a case originally diagnosed as in situ and later an invasive tumor with a different histology is diagnosed but still a single primary using Breast Solid Tumor Rule M10? See Discussion.
 



Discussion


SINQ 20200022 indicates that cases originally diagnosed as in situ do not have a new primary when a new invasive tumor with a different histology is diagnosed within 5 years. Should histology and/or behavior get updated for the in situ breast primary?



Answer


Update the histology and behavior based on the invasive tumor when an invasive tumor is diagnosed within 5 years of an in situ tumor in the same breast. This will be updated in the 2021 revisions of the Breast Solid Tumor Rules.



History




Last Updated


07/10/2020

Date Finalized


10/14/2020