PRDM1 is a tumor suppressor gene in an in vitro model of ALCL. (A) PRDM1/BLIMP1 mRNA and protein level after infection with empty vector (pWPI) or vector for BLIMP1 reexpression (pWPI-HA-BLIMP1). (B) Percentage of GFP-positive cells after infection at 72 hours and 96 hours. (C) Percentage of growing cells after infection at 72 hours. *P = .017. (D) Growth curve after infection, cells counted at days 3, 5, and 7 after infection. (E) Percentage of dead cells after infection at 72 hours and 96 hours. (F) Cell-cycle profile after infection.