My research focused on acute myeloid leukemia (AML) and B-lymphoblastic leukemia/lymphoma. I demonstrated the unique features of patients with de novo AML carrying the Philadelphia chromosome, which was subsequently recognized in the 2016 edition of World Health Organization classification. I also demonstrated that patients with terminal deoxynucleotidyl transferase (TdT)-positive aggressive B-cell lymphoma should be distinguished from patients with de novo B-lymphoblastic leukemia/lymphoma, which was subsequently recognized in the 2022 edition of World Health Organization classification.