TERT and neoplasm: In univariate analysis, TERT promoter mutations (HR = 4·3, 95% CI = 1·4–13·3, P = 0·01), older age at initial surgery (HR = 1·05, 95% CI = 1·01–1·08, P = 0·01), larger tumour size (HR = 1·04, 95% CI = 1·01–1·06, P = 0·01) and Stage IV disease (HR = 14·0, 95% CI = 4·4–43·9, P < 0·0001) were all significantly associated with a lower disease‐free survival.