KLF4 and cancer: Surprisingly, KLFs have a function in regulating the proliferation, migration and invasion of OS cells as well as affecting OS cancer stem cell‐like phenotype, and the main KLF family members involved are KLF2, KLF3, KLF4, KLF5, KLF6, KLF7, KLF8, KLF9 and KLF11.