Introduction: Calcitonin (Ctn) is a hormone secreted by thyroid "C" cells and is considered an excellent marker for medullary thyroid carcinoma (MTC). However, the use of Ctn to screen patients with nodular thyroid disease (NTD) remains controversial.
Objective: The aim of this work was to define the frequency of hypercalcitoninemia among NTD patients followed at a tertiary referral hospital.
Methods: A retrospective analysis was made of basal Ctn measurements and corresponding patients' records between January 2011 and December 2015. Hypercalcitoninemia was defined as > 10 pg/mL. Depending on the Ctn value, three groups were considered: G1, ≤10 pg/mL; G2, 10-100 pg/mL; G3, ≥100 pg/mL.
Results: Ctn was requested in an NTD context for 1,504 patients, 69 of whom had hypercalcitoninemia. Of these, 20 underwent surgery (G2, 11; G3, 9), and a histological diagnosis of MTC was established in 12 (G2, 3/27%; G3, 9/100%). Surgery was chosen based solely on Ctn levels in 7 cases, since only 5 had a positive cytology.
Conclusions: Hypercalcitoninemia was found in 4.6% of NTD patients. Ctn levels ≥100 pg/mL were associated with a greater CMT risk than values between 10 and 100 pg/mL, reinforcing results from other groups. The need for an adequate interpretation of results as well as an appropriate selection of patients to surgery stresses the importance of endocrinologists requesting and interpreting results.
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| http://dx.doi.org/10.1159/000494834 | DOI Listing |
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