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A 66-year-old has pancytopenia. Erythroid precursors make up 88% of marrow cells, and 40% of all marrow cells are proerythroblasts that are PAS positive and express CD71 and E-cadherin. These cells are MPO negative, B12 and folate are normal, and TP53 is mutated. Under the WHO 5th edition, the diagnosis is:
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