Table 1. Definitions of malignant tumor.

Condition	Description
Basic condition 1	Having the date of the initial visit to the hospital or hospitalization for a clinical event of malignant tumor AND a confirmed malignant tumor diagnosis flag assigneda, with the first clinical event during the data extraction period being the only event to be studied
Additional condition 1	[tumor marker, histological malignant tumor, and other related tests (category code D)] within 1 month before or after the date of the initial visitb
Additional condition 2	[treatment/management of specified diseases (category code B)] within 1 month before or after the date of the initial visitb
Additional condition 3	[pathological diagnosis (category code N)] within 1 month before or after the date of the initial visitb
Additional condition 4	[photographing/imaging, etc. (category code E)] within 1 month before or after the date of the initial visitb
Additional condition 5	[surgery (category code K)] within 3 months after the date of the initial visitb
Additional condition 6	[drug prescription (limited to drugs designated in the drug code list)] within 3 months after the date of the initial visitb
Additional condition 7	[radiotherapy (category code M)] within 6 months after the date of the initial visitb
Additional condition 8	[anti-malignant tumor infusion (medical practice code list category code G)] within 3 months after the date of the initial visitb
“Possible cases” (Basic condition 2)	Basic condition 1 AND additional conditions (1 OR 2 OR 3 OR 4 OR 5 OR 6 OR 7 OR 8)

^a Having an ICD-10 code for malignant tumor designated in the disease code list.

^b The date of initial visit to the hospital or hospitalization, including the day of the visit or hospitalization.

ICD-10: International Statistical Classification of Diseases and Related Health Problems 10th revision.