Treatment Decision Guided by Circulating Tumor Cell Count May Improve Long-term ...
 

I normally post articles related to Her2 positive only, but I think the below article worth reading especially if it's difficult or risky to do a surgical biopsy.

Treatment Decision Guided by Circulating Tumor Cell Count May Improve Long-term Outcomes for Patients with Metastatic Breast Cancer

https://www.aacr.org/about-the-aacr/...breast-cancer/