KLF4 and posterior cortical atrophy: The multitude of CSC surface and intracellular markers detected in PCa, for example, c-kit, CD133, CD44, α2β1 integrin, CXCR4, Sox2, Oct3/4, Nanog, c-myc, and Klf4 [15], emphasizes the molecular and biological diversity of CSCs in PCa.