Frequent somatic mutations of the telomerase reverse transcriptase promoter in ovarian clear cell carcinoma but not in other major types of gynaecological malignancy

The Journal of Pathology
Ren-Chin WuTian-Li Wang

Abstract

Up-regulated expression of telomerase reverse transcriptase (TERT) and subsequent maintenance of telomere length are essential in tumour development. Recent studies have implicated somatic gain-of-function mutations at the TERT promoter as one of the mechanisms that promote transcriptional activation of TERT; however, it remains unclear whether this genetic abnormality is prevalent in gynaecological neoplasms. We performed mutational analysis in a total of 525 gynaecological cancers, and correlated TERT promoter mutations with clinicopathological features. With the exception of ovarian clear cell carcinomas, in which mutations were found in 37 (15.9%) of 233 cases, the majority of gynaecological malignancies were wild-type. TERT promoter mutation does not appear to be an early event during oncogenesis, as it was not detected in the contiguous endometriosis associated with ovarian clear cell carcinoma. Ovarian clear cell carcinoma cell lines with TERT promoter mutations exhibited higher TERT mRNA expression than those with wild-type sequences (p = 0.0238). TERT promoter mutation tended to be mutually exclusive with loss of ARID1A protein expression (p = 4.4 × 10(-9) ) and PIK3CA mutation (p = 0.0019) in ovarian clear cell carcin...Continue Reading

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