The combination of milademetan and the MEK inhibitor trametinib was synergistic in growth inhibition of ECLC5-GLx (TRIM33-RET/MDM2amp), LUAD12c (METex14/KRASG12S/MDM2amp), SW1573 (KRASG12C,TP53 wildtype) and A549 (KRASG12S) cells, and in increasing expression of pro-apoptotic proteins PUMA and BIM.... Combined MDM2/MEK inhibition demonstrates efficacy across multiple patient-derived LUAD models harboring MDM2amp and concurrent oncogenic drivers.