P758: INHIBITION OF ATR WITH CERALASERTIB (AZD6738) FOR THE TREATMENT OF PROGRESSIVE OR RELAPSED MYELODYSPLASTIC SYNDROMES AND CHRONIC MYELOMONOCYTIC LEUKEMIA: A PHASE IB/II STUDY. (23rd June 2022) - Brunner, A.; Liu, Y.; Mendez, L.; Garcia, J.; Amrein, P.; Neuberg, D.; Dean, E.; Smith, S.; Stone, R.; Fathi, A.; Walter, M.; Graubert, T.; et al.