Starting from 2018, "Brain and nervous system" is replaced by "Brain and other central nervous system" in HKCaR reporting. Malignant tumours are those with ICD-10 C70-C72 and C75.1-C75.3 and broadly correspond to WHO grades II-IV. Figures of prior year under "Brain and nervous system" are provided for reference only. Comparison against prior year is not applicable.