Document Detail

Chromosome translocation frequency after radioiodine thyroid remnant ablation: a comparison between recombinant human thyrotropin stimulation and prolonged levothyroxine withdrawal.
MedLine Citation:
PMID:  19509107     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Thyroid remnant ablation of differentiated thyroid carcinoma (DTC) patients is traditionally performed after levothyroxine withdrawal. Recombinant human TSH (rhTSH) administration increases serum TSH levels without inducing hypothyroidism. AIM: The aim of the study was to investigate the frequency of chromosome translocations in DTC patients after the first (131)I therapeutic dose and compare the frequency of translocations between DTC patients off levothyroxine and those receiving rhTSH. PATIENTS AND METHODS: A total of 20 DTC patients were randomly assigned to levothyroxine withdrawal [(30 d) group A; n=10, nine women; mean age 48.5+/- 19.2 yr] or rhTSH injections [(0.9 mg im per 2 consecutive days) group B; n=10, eight women; mean age 50.4+/- 18.8 yr] before undergoing (131)I activity (3.7 GBq). The frequency of translocations in peripheral lymphocytes was analyzed by tricolor fluorescence in situ hybridization with whole-chromosome-specific probes for chromosomes 1, 4, and 8. Lymphocytes were stained routinely (about 500 each time). RESULTS: The two groups showed similar baseline translocation frequency. After (131)I administration, the total chromosomal translocation rate was significantly lower in group B than group A (P = 0.02). The frequency of translocations increased significantly in group A only (P = 0.01 vs. baseline). Rearrangement specifically involved chromosomes 4 and 8 (P = 0.02 vs. baseline). CONCLUSIONS: Our preliminary data show that in hypothyroid status (131)I ablation therapy induces a higher translocation rate, especially in chromosomes 4 and 8. This finding, in agreement with previous dosimetric reports, suggests that whereas inducing a low extrathyroid exposure, rhTSH reduces the potential risk of chromosomal aberration associated with blood irradiation.
Anna Frigo; Angela Dardano; Elisa Danese; Maria Vittoria Dav??; Paolo Moghetti; Chiara Colato; Giuseppe Francia; Franca Bernardi; Claudio Traino; Fabio Monzani; Marco Ferdeghini
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial     Date:  2009-06-09
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  94     ISSN:  1945-7197     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-07     Completed Date:  2009-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3472-6     Citation Subset:  AIM; IM    
Department of Surgical and Biomedical Sciences, University of Verona, 37129 Verona, Italy.
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MeSH Terms
Bone Marrow / radiation effects
Iodine Radioisotopes / therapeutic use*
Middle Aged
Recombinant Proteins / therapeutic use
Thyroid Neoplasms / genetics,  radiotherapy*
Thyrotropin / therapeutic use*
Thyroxine / administration & dosage*
Translocation, Genetic*
Reg. No./Substance:
0/Iodine Radioisotopes; 0/Recombinant Proteins; 7488-70-2/Thyroxine; 9002-71-5/Thyrotropin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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