Loss of CDKN2A rendered KPC-luc cells susceptible to direct apoptosis from dual CDK/BET inhibition….In vivo, combined BET/CDK inhibition increased T cell infiltration into PDAC tumors, and when combined with PD-L1 blockade diminished tumor growth….This suggests combined CDK/BET inhibition may be a personalized therapeutic approach for patients with CKDN2A-deficient PDAC, and a means to sensitize PDAC to immunotherapy.