As demonstrated in the high rates of cytopenia in more than one hematopoietic lineages, current supportive care measures that are lineage specific (G‐CSF for neutropenia, RBC transfusion or ESAs for anemia, platelet transfusion for thrombocytopenia) do not address the burden of myelosuppression in other lineages. The gene discussed is CSF3; the disease is anemia (phenotype).