De Novo Pure Erythroid Leukemia With Rapid Progression and Multiple Lytic Bone Lesions: A Case Report.

A 62-year-old male patient presented with malaise and severe macrocytic anemia. Computed tomography revealed an osteolytic lesion in the left iliac bone. Bone marrow examination revealed that 90% of erythroblasts were large with periodic acid-Schiff (PAS)-positive staining while flow cytometry and immunostaining revealed CD71 (+), GP-A (+), p53 (+), CD117 (+), and CD34 (-) results, indicating pure erythroid leukemia (PEL) diagnosis. A needle biopsy of the osteolytic lesion revealed the same characteristics as PEL. Azacitidine therapy was administered as the first-line treatment, and his general condition temporarily improved. However, PEL quickly deteriorated, and he died 42 days of hospitalization after initial admission. PEL is an extremely rare form of acute myeloid leukemia (AML) and has presented cytogenetic characteristics in addition to the TP53 mutation. Other AML treatment is used because a standard treatment method is unavailable. However, the prognosis is extremely poor. Furthermore, few cases of concurrent bone lesions are reported globally, and more cases must be accumulated and analyzed.