CD90 has previously been used as a surface marker to isolate (cancer‐associated) fibroblasts in gastrointestinal mucosa and ovarian cancer tissue (Gedye et al., 2014; Kisselbach et al., 2009) and also serves as a widely expressed mesenchymal surface marker (Jiang and Rinkevich, 2018). This evidence concerns the gene THY1 and ovarian carcinoma.