The study of Barthel et al. about telomere length of 31 cancer types from the Cancer Genome Atlas (TCGA) cohort and the study of Arita et al. showed that regardless of the TERT promoter methylation status, TERT expression was increased in almost all tumors with mutations in the TERT promoter [30], which in turn affected telomerase activity in tumors [10]. This evidence concerns the gene TERT and cancer.