MSI1 and medulloblastoma: Medulloblastoma-associated CSCs selected by serum-free medium with bFGF and EGF can form 3 D spheroids and display enhanced self-renewal and highly co-expressed stem cell genes (Oct4, Nanog, Nestin, and Musashi-1) as well as anti-apoptotic genes (Bcl-2 and Bcl-XL) [143].