TERT and cancer: However, TERT transcripts range widely in various cancers, and their protein expression is highly correlated with GREPL2 expression, in line with our analysis (r = 0.705, Table 1), although less correlations are observed for tumor grade (r = 0.456), ATRX expression (r = 0.454), patients’ age (r = 0.446), and IDH1 expression (r = 0.326).