PROM1 and cancer: Given that the emergence of chemoresistance is linked to increased cancer stem-like characteristics, we quantified the following markers of HGSC cancer stem-like cells:[40–43] CD44,[44–46] CD24,[47–49] CD90,[50–52] CD133,[53–55] and ALDH activity.[54,56–59] Markers of cancer stem-like cells on GFP-labeled cancer cells were evaluated using flow cytometry after harvesting tumoroids.