• CCNE1 -amp and FBXW7 LOF are associated with high levels of replication stress and depend on the inhibitory phosphorylation of CDK1 at Thr14 (CDK1 pT14) by PKMYT1 to prevent premature mitosis • Lunresertib (RP-6306) is a clinical stage, potent and selective oral inhibitor of PKMYT1, with single agent activity in CCNE1 -amp临床前模型