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Aggressive medullary thyroid cancer, an analysis of the Irish National Cancer Registry

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Abstract

Background and objectives

Medullary thyroid cancer consists of a spectrum of disease that ranges from extremely indolent tumors to aggressive types associated with a high mortality rate. The objective of our study is to evaluate the prognostic factors and outcomes of patients diagnosed with MTC in a homogenous population, and to examine patients diagnosed with MTC for mutations in the RET proto-oncogene from the same period.

Methods

A retrospective analysis of the National Cancer Registry in Ireland was undertaken, between 1998 and 2007. The Kaplan–Meier method was used to determine overall survival and factors predictive of outcome were determined by univariate and multivariate analysis by cox regression using Stata 13 software.

Main findings

Forty-three patients were diagnosed with medullary thyroid cancer, 55.8 % were female and 44.2 % were male. A median age of 52 was found. The overall median survival was 6.32 years and the 1- and 5-year overall survival was 88.37 and 62.79 %, respectively, with 10-year survival calculated at 48.63 %. On univariate analysis age, stage and surgical intervention were statistically significant indicators of prognosis. T stage and age remained statistically significant indicators of prognosis on multivariate analysis. Two patients with no history of MEN syndromes or family history of medullary thyroid cancer had RET proto-onocogene mutations.

Conclusions

Our patient cohort was substantially older and presented at an advanced T status than what is commonly seen in the literature. This may account for poor survival outcomes and the very low pick-up of RET mutations in sporadic medullary thyroid cancer.

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Correspondence to P. Lennon.

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No funding was required or sought for this project. The authors declare no conflict of interest. The use of this anonymized data for research is covered by the Statutory Instrument, which established the Registry Board in 1991, and therefore no further ethical approval was sought.

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We declare that there was no financial support or funding for this submission, and no sponsors.

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We declare that there were no financial or personal relationships with other people or organizations that could inappropriately influence or bias the authors’ actions.

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Lennon, P., Deady, S., White, N. et al. Aggressive medullary thyroid cancer, an analysis of the Irish National Cancer Registry. Ir J Med Sci 186, 89–95 (2017). https://doi.org/10.1007/s11845-016-1455-1

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  • DOI: https://doi.org/10.1007/s11845-016-1455-1

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