沈阳医学院附属医院张永令同志认为,碘-131治疗甲状腺机能亢进症的致癌作用及可能的遗传学效应尚在争论中,医疗实践时应慎重.此意见我们认为值得考虑. Comrade Zhang Yongling at the Affiliated Hospital of Shenyang Medical College believes that the carcinogenicity and possible genetic effects of iodine-131 in the treatment of hyperthyroidism are still under debate and caution should be exercised in medical practice. This opinion is worth considering.