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Lunresertib is an investigational new drug that is being evaluated for the treatment of cancer. It is an oral small molecule inhibitor of PKMYT1, developed by Repare Therapeutics.[1] This drug targets cell cycle regulation in tumors with specific genetic alterations, including CCNE1 amplifications or FBXW7 and PPP2R1A loss of function mutations. It is currently in phase 1/2 clinical trials, both as monotherapy or in combination with camonsertib, an ATR inhibitor.[2]