Several important conclusions can be drawn from the obtained interactome data: consistent with BAG3's proposed role in promoting cancer stemness like properties,33, 34 we found an enrichment of the stemness regulators NES, VIM, and SOX2 in sphere‐cultured BAG3‐expressing U251 cells versus BAG3‐KO (EV) cells. This evidence concerns the gene SOX2 and cancer.