ACTA1 and ovarian neoplasm: For example, based on an integrated flow cytometry analysis of FAP, CD29, αSMA, FSP1, PDGFRβ, and CAV1 expression, four different CAFs subsets (named CAF-S1 to -S4) have been identified in different breast and ovarian tumor subtypes and differentially accumulate within the TME [64] (Figure 1B).