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Cancer. 2016 May 1;122(9):1370-9. doi: 10.1002/cncr.29934. Epub 2016 Mar 11.

Prognostic effects of TERT promoter mutations are enhanced by coexistence with BRAF or RAS mutations and strengthen the risk prediction by the ATA or TNM staging system in differentiated thyroid cancer patients.

Song YS1, Lim JA1,2, Choi H1,3, Won JK4, Moon JH1,5, Cho SW1, Lee KE6,7, Park YJ1,7, Yi KH1,8, Park DJ1, Seo JS7,9.

Author information

1
Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2
Department of Internal Medicine, National Medical Center, Seoul, Korea.
3
Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, Korea.
4
Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.
5
Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
6
Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
7
Genomic Medicine Institute, Medical Research Center, Seoul National University, Seoul, Korea.
8
Department of Internal Medicine, Boramae Medical Center, Seoul, Korea.
9
Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea.

Abstract

BACKGROUND:

Recent reports suggest that mutations in the promoter of the gene encoding telomerase reverse transcriptase (TERT) affect thyroid cancer outcomes.

METHODS:

In all, 551 patients with differentiated thyroid cancer (DTC) enrolled in this study. The median follow-up duration was 4.8 years (interquartile range, 3.4-10.6 years).

RESULTS:

TERT promoter mutations were detected in 25 DTCs (4.5%): 2.8% in neither BRAF-mutated nor RAS-mutated tumors, 4.8% in BRAF-mutated tumors, and 11.3% in RAS-mutated tumors. Moreover, they were frequently observed in American Thyroid Association (ATA) high-risk and TNM stage III/IV groups (9.1% and 12.9%, respectively). The coexistence of BRAF or RAS with TERT promoter mutations increased aggressive clinicopathologic features, recurrence (hazard ratio [HR] for BRAF, 4.64; 95% confidence interval [CI], 1.42-15.18; HR for RAS, 5.36; 95% CI, 1.20-24.02), and mortality (HR for BRAF, 15.13; 95% CI, 1.55-148.23; HR for RAS, 14.75; 95% CI, 1.30-167.00), even after adjustments for the age at diagnosis and sex, although the significance was lost after additional adjustments for pathologic characteristics. Furthermore, TERT promoter mutations significantly increased the risk of both recurrence and mortality in the ATA high-risk (HR for recurrence, 5.79; 95% CI, 2.07-16.18; HR for mortality, 16.16; 95% CI, 2.10-124.15) and TNM stage III/IV groups (HR for recurrence, 3.60; 95% CI, 1.19-10.85; HR for mortality, 9.06; 95% CI, 2.09-39.26).

CONCLUSIONS:

The coexistence of BRAF or RAS mutations enhanced the prognostic effects of TERT promoter mutations. Furthermore, TERT promoter mutations strengthened the predictions of mortality and recurrence by the ATA and TNM staging systems, particularly for high-risk patients with DTC. Cancer 2016;122:1370-1379. © 2016 American Cancer Society.

KEYWORDS:

differentiated thyroid cancer; mortality; prognosis; recurrence; telomerase reverse transcriptase (TERT) promoter mutations

PMID:
26969876
DOI:
10.1002/cncr.29934
[Indexed for MEDLINE]
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