To validate our finding in the TCGA IDH-mutant astrocytoma tumours that MYC expression is increased in tumours with a somatic copy number loss of the chromosome 19q MCR, we re-analysed single cell RNA-seq data from 8 IDH-mutant astrocytoma samples by Venteicher et al. [25]. The gene discussed is IDH1; the disease is astrocytoma (excluding glioblastoma).