Abstract
Sister chromatid exchanges, a sensitive measure of chromosome damage, were counted in peripheral blood lymphocytes from 23 patients with juvenile chronic arthritis receiving long term, low dose chlorambucil treatment. Thirty five patients with juvenile chronic arthritis who had not been treated with cytotoxic drugs served as controls. All of the treated patients have cells with abnormal sister chromatid exchange frequencies. Damage is related to the daily dose and may, in part, be determined by the duration of treatment. Sister chromatid exchanges from nine patients who had received chlorambucil at some time in the past remained high for at least five months after stopping the drug. Long term follow up will determine whether sister chromatid exchange analysis can help predict those most at risk of drug induced malignancies.
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