In addition to persistent DNA damage, ALT‐positive human cancer cells are defined by several unique cellular phenotypes including heterogeneous telomere length, nuclear phase‐separated condensates called ALT‐associated PML bodies (APBs), and C‐rich extrachromosomal telomeric repeats (C‐circles) 2, 3, 11, 12, 13. This evidence concerns the gene GPT and cancer.