Cytogenetic alterations and oxidative stress in thyroid cancer patients after iodine-131 therapy

ISSN： 1464-3804

Source： Mutagenesis, Vol.15, Iss.1, 2000-01, pp. : 69-75

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Abstract

This study aimed to assess two end-points of DNA damage, namely chromosomal aberrations and micronuclei in peripheral lymphocytes, and their possible relationship with oxidative stress (which may be related to DNA damage and repair) in thyroid cancer patients receiving therapeutic doses of ¹³¹I. Nineteen patients receiving 2590 MBq (70 mCi) were studied. Chromosomal aberrations were scored using standard cytogenetic methods and micronuclei scored in cytokinesis-blocked lymphocytes. Oxidative stress was assessed by determining thiobarbituric acid-reactive substances in blood, total plasma antioxidant status and serum uric acid levels. All parameters were assessed before treatment and 1 and 6 months after ¹³¹I administration. The frequency of micronucleated cells per 1000 binucleated cells scored (mean ± SEM) increased significantly from 5.21 ± 0.80 to 9.68 ± 1.22 1 month after treatment (P < 0.01)="" and="" to="" 8.42="" ±="" 1.28="" 6="" months="" after="" treatment="">P < 0.05).="" the="" frequency="" of="" cells="" with="" chromosomal="" aberrations,="" excluding="" gaps,="" per="" 100="" cells,="" increased="" significantly="" from="" 1.68="" ±="" 0.41="" to="" 3.47="" ±="" 0.55="" 1="" month="" after="" treatment="">P < 0.01)="" and="" to="" 4.05="" ±="" 0.46="" 6="" months="" after="" treatment="">P < 0.01).="" oxidative="" stress="" parameters="" showed="" slight="" modifications="" over="" the="" time="" period="" studied,="" but="" the="" differences="" were="" not="" significant="" except="" for="" a="" decrease="" in="" thiobarbituric="" acid-reactive="" products="" 6="" months="" after="" therapy="">P < 0.05)="" and="" in="" serum="" uric="" acid="" concentration="" 1="" and="" 6="" months="" after="" therapy="">P < 0.01).="" this="" report="" demonstrates="" slight="" but="" significant="" and="" persistent="" dna="" damage="" in="">¹³¹I-treated patients as assessed by cytogenetic assays. There was no clear correlation between the cytogenetic findings and oxidative stress parameters studied.