RIPK1 and lung cancer: Induction of PP2A-dependent necroptosis by FTY720 was also detected in H157 (K-Ras mutant) and H827 (EGFR mutant) human lung cancer cells, in which inhibition of RIPK1 or PP2A using necrostastin or OA and knockdown of RIPK1 or PP2Ac prevented FTY720-mediated cell death compared to controls (Supporting Information Fig S12A–C).