RESUMO
RATIONALE: Acute promyelocytic leukemia is a special subtype of acute myeloid leukemia. The incidence of early death and complications is high. An oral regimen of all-trans retinoic acid combined with the realgar-indigo naturalis formula (RIF) without chemotherapy has provided a new strategy for the treatment of these patients. PATIENT CONCERNS: A 92-year-old male patient was admitted to the hospital due to fatigue and oral bleeding. He had no fever or lung infection. Routine blood test showed white blood cell count 1.0â×109/L, hemoglobin 100âg/L, and platelets 21â×â109/L. Coagulation function indicated fibrinogen 1.02âg/L and D-dimer 2360âng/mL. And 28% abnormal promyelocytes were observed in peripheral blood. DIAGNOSIS: A bone marrow morphologic, immunophenotypic, cytogenetic, and molecular examination was performed. Routine bone marrow examination showed active proliferation of nucleated cells, with promyelocytes accounting for 91%; immunophenotyping revealed an early myeloid cell population, accounting for approximately 82.4% of all cells. INTERVENTIONS: From February 15, 2020, 25âmg/m2 all-trans retinoic acid was orally administered daily. After the fusion gene result was obtained, oral administration of 60âmg/kg RIF daily began since February 18, 2020. The combination of the 2 agents was given until March 16, 2020. Oral administration of 25âmg/m2 retinoic acid daily began from March 20, 2020 for 2âweeks, and oral administration of 60âmg/kg RIF daily lasted for 4âweeks as the consolidation therapy. During the treatment, the proportion of promyelocytes in peripheral blood, white blood cell count, platelets, coagulation function, liver function, and QT interval were monitored. OUTCOMES: Oral retinoic acid and oral RIF were given without chemotherapy and the patient achieved bone marrow remission after 1âmonth, and molecular remission was achieved 2âmonths later. In the early stage of acute promyelocytic leukemia, combined thrombocytopenia and disseminated intravascular coagulation may develop. Platelet and fresh frozen plasma infusion were proactively given until platelets were stabilized above 30â×â109/L, and the coagulation function returned to normal. LESSONS: The regimen was safe and effective, and subsequent treatment did not require hospitalization, which helped to improve the patient's quality of life.