fig2
![Liquid biopsy: expanding the frontier of circulating biomarker discovery and validation in breast cancer](https://image.oaes.cc/4fb847bb-8a93-48e5-881d-d9ed7264c154/3295.fig.2.jpg)
Figure 2. Clusters of circulating cells detected in whole blood liquid biopsy samples from a patient with metastatic breast cancer. A: representative heterotypic cluster of circulating tumor cells (CTCs) and circulating cancer associated fibroblasts (cCAFs); B: representative homotypic cluster of cCAFs. Blue: DAPI; Red: FAP; Green: Cytokeratin; White: CD45. Scale bar = 20 µm. Data reproduced from Ao et al.[46]