Cancer types
In our study, we grouped childhood cancers into six categories based on the National Cancer Registry Annual Report: leukemia (C91-C95), brain and central nervous system cancer (C70-C72), non-Hodgkin’s lymphoma (C82-C85, C96), bone and articular cartilage cancer (C40-C41), mesothelioma soft tissues (C45-C49), and the remaining group of ‘other’ cancers.
We classified cancer treatment into 3 phases: early, middle, and late phases. The early phase is the first year following diagnosis, the middle phase includes the second to the fourth year following diagnosis, and the late phase is the fifth year following diagnosis. The early phase has been further divided into 3, 6, 9, and 12 months.