Grade Post Therapy


**Note 1:** Leave post-therapy grade blank when * No neoadjuvant therapy * Clinical or pathological case only * There is only one grade available and it cannot be determined if it is clinical, pathological or post-therapy **Note 2:** Assign the highest grade from the resected primary tumor assessed after the completion of neoadjuvant therapy. **Note 3:** Codes 1-4 take priority over A-D. **Note 4:** Code 9 when * Surgical resection is done after neoadjuvant therapy and grade from the primary site is not documented * Grade checked “not applicable” on CAP Protocol (if available) and no other grade information is available


NAACCR #3845


Code Description
1 G1: Tumor with areas of retinoma [retinocytoma] (fleurettes or neuronal differentiation)
2 G2: Tumor with many rosettes (Flexner–Wintersteiner or Homer Wright)
3 G3: Tumor with occasional rosettes (Flexner–Wintersteiner or Homer Wright)
4 G4: Tumor with poorly differentiated cells without rosettes and/or with extensive areas (more than half of tumor) of anaplasia
A Well differentiated
B Moderately differentiated
C Poorly differentiated
D Undifferentiated, anaplastic
9 Grade cannot be assessed (GX); Unknown
<BLANK> See Note 1