The answer is D: Oncotype DX®.

Oncotype DX® is a 21-gene assay performed on breast tumor cells' RNA. It has both prognostic and predictive uses. Read more about Oncotype DX® here and here

BRCA1 is a genetic test; however, it is performed on the blood, not tumor cells. 

CA 27.29 is a breast cancer tumor marker, a substance secreted by the tumor and plays a significant role in staging and diagnosis.  

CTCs are used to detect microscopic metastases and may be prognostic of recurrence.  


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