Measurement of Calcitonin and Calcitonin Gene-Related Peptide mRNA Refines the Management of Patients with Medullary Thyroid Cancer and May Replace Calcitonin-Stimulation Tests

Measurement of Calcitonin and Calcitonin Gene-Related Peptide mRNA Refines the Management of Patients with Medullary Thyroid Cancer and May Replace Calcitonin-Stimulation Tests

Author Camacho, Cleber P. Autor UNIFESP Google Scholar
Lindsey, Susan C. Autor UNIFESP Google Scholar
Melo, Maria Clara C. Autor UNIFESP Google Scholar
Yang, Ji H. Autor UNIFESP Google Scholar
Germano-Neto, Fausto Autor UNIFESP Google Scholar
Valente, Flavia de O. F. Autor UNIFESP Google Scholar
Lima, Thiago R. N. Autor UNIFESP Google Scholar
Biscolla, Rosa Paula M. Autor UNIFESP Google Scholar
Vieira, Jose G. H. Autor UNIFESP Google Scholar
Cerutti, Janete M. Autor UNIFESP Google Scholar
Dias-da-Silva, Magnus R. Autor UNIFESP Google Scholar
Maciel, Rui M. B. Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Background: Serum calcitonin (sCT) is the main tumor marker for medullary thyroid cancer (MTC), but it has certain limitations. Various sCT assays may have important intra-assay or interassay variation and may yield different and sometimes conflicting results. A pentagastrin-or calcium-stimulation calcitonin (CT) test may be desirable in some situations. Alternatively, or in the absence of the stimulation test, mRNA detection offers the advantages of being more comfortable and less invasive; it only requires blood collection and has no side effects. the objective of this study was to investigate the applicability of measuring calcitonin-related polypeptide alpha (CALCA) gene transcripts (CT-CALCA and calcitonin gene-related peptide [CGRP]-CALCA) in patients with MTC and in relatives diagnosed with a RET mutation and to test mRNA as an alternative diagnostic tool for the calcitonin-stimulation test.Methods: Twenty-three healthy controls and 26 individuals evaluated for MTC were selected, including patients with sporadic or hereditary MTC and RET mutation-carrying relatives. for molecular analysis, RNA was extracted from peripheral blood, followed by cDNA synthesis using 3.5 mu g of total RNA. Quantitative real-time polymerase chain reaction (RT-qPCR) was performed with SYBR Green and 200nM of each primer for the two specific mRNA targets (CT-CALCA or CGRP-CALCA) and normalized with the ribosomal protein S8 as the reference gene.Results: We detected CALCA transcripts in the blood samples and observed a positive correlation between them (r = 0.946, p < 0.0001). Both mRNAs also correlated with sCT (CT-CALCA, r = 0.713, p < 0.0001; CGRP-CALCA, r = 0.714, p < 0.0001). the relative expression of CT-CALCA and CGRP-CALCA presented higher clinical sensitivity (86.67 and 100, respectively), specificity (97.06 and 97.06), positive predictive value (92.86 and 93.75), and negative predictive value (94.29 and 100), than did sCT (73.33, 82.35, 64.71, and 87.50, respectively). in addition, the CALCA transcript measurement mirrored the response to the pentagastrin test.Conclusion: We demonstrate that the measurement of CALCA gene transcripts in the bloodstream is feasible and may refine the management of patients with MTC and RET mutation-carrying relatives. We propose considering the application of this diagnostic tool as an alternative to the calcitonin-stimulation test.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Fleury Group
Brazilian Ministry of Health
Grant number FAPESP: 2006/60402-1
FAPESP: 2010/51547-1
FAPESP: 2009/11257-7
FAPESP: 2011/0787-2
FAPESP: 2011/20747-8
Fleury Group: 12518
Brazilian Ministry of Health: 25000.168513/ 2008-11
Date 2013-03-01
Published in Thyroid. New Rochelle: Mary Ann Liebert Inc, v. 23, n. 3, p. 308-316, 2013.
ISSN 1050-7256 (Sherpa/Romeo, impact factor)
Publisher Mary Ann Liebert Inc
Extent 308-316
Origin http://dx.doi.org/10.1089/thy.2012.0361
Access rights Closed access
Type Article
Web of Science ID WOS:000315951900010
URI http://repositorio.unifesp.br/handle/11600/36048

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