Incidence of hematologic cancer types in Japan by ICD-O-3 code: analysis of National Cancer Registry

<b>Aim:</b> We classified subtypes of hematologic cancer in Japan's National Cancer Registry (NCR) in 2016 by ICD-O-3 code and compared numbers with the Japanese Society of Hematology's Blood Diseases Registry (BDR).<b>Materials & methods:</b> We reviewed data for individual cases, and calculated incidence per 100,000.<b>Results:</b> NCR reported 67,919 cases of hematological cancer, including diffuse large B-cell lymphoma, Not Otherwise Specified (NOS) (11.07 per 100,000), plasma cell myeloma (5.26/100,000), myelodysplastic syndrome, NOS (3.92/100,000), malignant lymphoma, NOS (3.03/100,000), marginal zone B-cell lymphoma, NOS (2.52/100,000) and follicular lymphoma, grade 1 (1.43/100,000). Around 48% of NCR cancers were also reported in the Blood Diseases Registry.<b>Conclusion:</b> ICD-O-3 codes revealed 12,365 additional cases to the 55,554 reported publicly. Accurately updated data are necessary for medical resource planning.