California Cancer Reporting System Standards Volume I: Abstracting and Coding Procedures for Hospitals
If a benign or borderline tumor transforms into a malignancy, abstract the malignancy as a new primary. If there is a change in WHO grade from a WHO I to a higher WHO grade, abstract as a new primary malignancy. If a malignant CNS tumor transforms into a higher grade tumor, do not change histology or grade and do not abstract as a new primary. This determination is made by the pathologist based on review of slides.
Non-malignant WHO grade I to malignant WHO grade III.
Complete two abstracts, one for the non-malignant tumor and one for the malignant tumor.
Situation |
Create new abstract? |
Benign /0 to borderline /1 |
No* |
Benign /0 to malignant /3 |
Yes |
Borderline /1 to malignant /3 |
Yes |
Malignant /3 to malignant /3 |
No* |
WHO Grade I to Grade II, III, or IV |
Yes |
WHO Grade II to III or IV |
No* |
WHO Grade III to IV |
No* |
* Abstract as one primary using original histology and note progression in remarks.