Abstract
Background
Simultaneous medullary thyroid carcinoma (MTC) and differentiated thyroid carcinoma (DTC) is a rare entity. This is the first population-level analysis of the characteristics and outcomes of simultaneous MTC/DTC.
Methods
In the Surveillance, Epidemiology, and End Results (SEER) database (1988–2008), patients with simultaneous MTC/DTC were retrospectively compared with those with MTC alone using χ2, ANOVA, log-rank tests, Cox multivariate regression, and Kaplan–Meier analyses.
Results
A total of 162 patients had simultaneous MTC/DTC; 1,699 had MTC alone. MTC was diagnosed first in 67.9 % of simultaneous MTC/DTC cases. Simultaneous MTC/DTC increased from 2.7 % of all MTCs in 1988–1997 to 12.3 % in 2003–2008. Compared with MTC alone, simultaneous MTC/DTC had smaller mean MTC tumor size (2.9 vs. 2.2 cm; p = 0.005) and lower rates of MTC extrathyroidal extension (25.4 vs. 16.8 %; p = 0.015) and distant metastases (15.7 vs. 9.3 %; p = 0.032). Patients diagnosed with DTC first had smaller mean MTC tumor sizes (p = 0.01), whereas patients diagnosed with MTC first had tumor sizes similar to those of MTC alone. Compared with MTC alone, patients with simultaneous MTC/DTC were more likely to receive thyroidectomy (84.7 vs. 93.2 %; p = 0.003) and radioisotopes (4.4 vs. 25 %; p < 0.001). On Kaplan–Meier analysis, disease-specific survival rates were higher for simultaneous MTC/DTC than for MTC alone (10-year survival rates 87 vs. 81 %; p = 0.056).
Conclusions
Simultaneous MTC/DTC is diagnosed earlier in tumor development than MTC alone, with a trend toward better prognosis. This entity likely represents a primary tumor with an incidental pathologic finding of a second malignancy. Each malignancy should be treated according to its respective stage and current guidelines.
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RW was supported in part by the Yale School of Medicine Office of Student Research.
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Wong, R.L., Kazaure, H.S., Roman, S.A. et al. Simultaneous Medullary and Differentiated Thyroid Cancer: A Population-Level Analysis of an Increasingly Common Entity. Ann Surg Oncol 19, 2635–2642 (2012). https://doi.org/10.1245/s10434-012-2357-8
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DOI: https://doi.org/10.1245/s10434-012-2357-8