CER-1236 in Patients With Acute Myeloid Leukemia (AML), Myelodysplastic Syndrome (MDS), and Myelofibrosis (MF)

Inclusion Criteria: * Patients need to have a confirmed diagnosis of de novo or secondary AML, or myelodysplastic syndrome (MDS)/AML with 10% to 19% blasts, per the International Consensus Classification 2022 or the WHO 2022 classification. * Absolute lymphocyte count \>0.3 x 109/L prior to apheresis. * Eastern cooperative oncology group (ECOG) performance status 0 to 1. Exclusion Criteria: * Prior therapy with a permanently integrated, genetically modified cell product. * No measurable leukemia on the screening bone marrow evaluation prior to any bridging therapy. * Active autoimmune disease or history of autoimmune disease requiring treatment within the prior 2 years. Patients with history of autoimmune thyroiditis or type 1 diabetes well controlled on replacement regimen are eligible. * A known hypersensitivity or severe allergy to fludarabine, cyclophosphamide, or study drug components or diluents. * Any other medical, psychological, or social condition that may interfere with study participation or compliance, or compromise patient safety in the opinion of the physician. * Primary immunodeficiency disorder.