We recently showed that quantification of the relative level of GFAPδ to GFAPα, the GFAPδ/GFAPα ratio, using RNA sequencing data obtained from the cancer genome atlas (TCGA) indeed indicates that low‐ and high‐grade astrocytoma express different combinations of GFAP variants. The gene discussed is GFAP; the disease is astrocytoma (excluding glioblastoma).