Timothy Yap, MBBS, PhD, FRCP, The University of Texas MD Anderson Cancer Center, Houston, TX discusses the A1 results from the Phase I study of M1744 (NCT04170153), a potent, selective, orally administered ATR inhibitor that exerts antitumor activity in preclinical models. These early data show M1774 monotherapy in patients with advanced solid tumors is well-tolerated, and M1774 is under continued investigation in a biomarker-selected population in combination with niraparib. This interview took place at the European Society for Medical Oncology (ESMO) 2022 Congress in Paris, France.