DDIT4 and neoplasm: To investigate whether autophagy is involved in the regulation of DDIT4‐AS1 in promoting tumor progression, MDA‐MB‐231 cells were transfected with GV658‐DDIT4‐AS1 plasmid and BECN1 siRNA or ATG5 siRNA (Figure S4a,b, Supporting Information), and cell viability as well as migration was measured.