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GST profiling may be useful in the screening for thyroid nodule malignancy.
Fabiana Granja1, Joseane Morari, Elaine C Morari
1Laboratory of Cancer Molecular Genetics, Department of Medicine, State University of Campinas, São Paulo, Olympio Pattaro 45, 13085-857. Brazil.
Cancer Letters
|May 26, 2004
Summary
Genetic variations in Glutathione-S-Transferase P1 (GSTP1) enzymes are linked to increased thyroid cancer risk. GSTP1 profiling may aid in screening for malignant thyroid nodules.
Area of Science:
- Genetics
- Oncology
- Biochemistry
Background:
- The Glutathione-S-Transferase (GST) system, particularly GSTP1, is crucial for detoxifying carcinogens in head and neck tissues.
- Polymorphisms in the GSTP1 gene lead to variant enzymes with reduced detoxification capacity, potentially increasing cancer risk.
Purpose of the Study:
- To investigate the association between GSTP1 gene inheritance patterns and the risk of developing thyroid cancer.
- To evaluate GSTP1 genotype as a potential screening tool for thyroid nodule malignancy.
Main Methods:
- Genotyping of GSTP1 (including variant alleles GSTP1AB and GSTP1BB) using PCR-SSCP-sequencing.
- Comparison of genotypes in patients with malignant thyroid nodules (papillary and follicular carcinomas) against benign nodules and healthy controls.
- Exclusion of individuals with prior thyroid disease, radiation exposure, or malignancy history.
Main Results:
- A significant over-representation of variant GSTP1 alleles was observed in patients with papillary and follicular thyroid carcinomas compared to controls (p < 0.0001).
- Individuals with variant GSTP1 enzymes showed a substantially increased risk for papillary (7.092-fold) and follicular (9.625-fold) thyroid cancer, even after adjusting for confounding factors.
- GSTP1 genotype was significantly associated with increased susceptibility to thyroid cancer.
Conclusions:
- GSTP1 genetic variations may contribute to an elevated risk of thyroid cancer.
- GSTP1 profiling from peripheral blood could serve as a valuable and simple screening method for identifying individuals at higher risk for thyroid nodule malignancy.