CD44 and cancer: Immunofluorescence staining and microscopic imaging were used to assess the expression of selected cancer cell markers such as p53, Pax8, and cancer-associated fibroblast markers such as platelet derived growth factor receptor alpha (PDGFRα), fibroblast activation protein (FAP), pluripotency-related transcription factors Oct4, Sox2, and Nanog; and markers characteristic for ovarian CSCs, such as CD133, CD44, c-kit, and the marker of epithelial to mesenchymal transition (EMT), Snail molecule.