Microsatellite instability and its correlation with clinicopathological features in a series of thyroid tumors prevalent in iodine deficient areas

• Published in: Experimental & molecular medicine pp. 122 - 129
• Main Authors: Minal Vaish, Anjali Mishra, Manish Kaushal, Saroj K Mishra, Balraj Mittal
• Format: Journal Article
• Language: Korean
• Published: 생화학분자생물학회 01.04.2004
• Subjects: 생화학
• ISSN: 1226-3613; 2092-6413

Thyroid tumors display diverse spectrum of his-topathological groups with geographic variation in its prevalence. Influence of iodine deficiency (a major causative factor) in its etiology, prevalence, or aggressiveness is debatable which reflects the existence of various genetic events in pathoge-nesis. The present study was undertaken to study the role of Microsatellite instability (MSI) or LOH (loss of heterozygosity), an indicator of defective mismatch repair system as a genetic change and tumors. Tumor tisues from total thyroidectomy surgical specimens and blood (matched control) of 36 patients from iodine deficient areas (10 benign; 26 malignant) were obtained after their consent. Urinary iodine analysis was done by alkali ash method for which 10 ml of urine was colected from 18 patients before surgery. Genomic DNA, isolated from tumor tissue and blod was am-plified by polymerase chain reaction (PCR) using mono and dinucleotide markers - BAT-26, BAT-40, TGF(RII, IGFIIR, hMSH3, BAX, D2S123, D9S283, on 8% denaturing polyacrylamide gel folowed by autoradiography. Of total, 66.6% of tumors [70% (7/10) benign and 65.4% malignant cases (17/26)] showed MSI/LOH. Strong asociation of MSI/LOH with low iodine (P = 0.01) and with AMES risk groups i.e. age (P= 0.02), tumor size (P= 0.04) and metastases (P = 0.002) in thyroid tumors was observed. This may help in predicting the biolo-gical behaviour and strengthening the hypothesis thyroid tumors. Our results further substantiate the risk group clasification and help in deciding the treatment modality in particular patient. KCI Citation Count: 12