To determine the "in-vitro" intrinsic cell radiosensitivity (RS) as a risk indicator of radiation-related side-effects in patients with systemic lupus erythematosus (SLE) compared with healthy subjects (control group). Moreover, we elucidated if clinical, therapeutic and biological parameters could affect the "in-vitro" intrinsic RS in patients with SLE. Intrinsic RS was determined by the quantification of the initial radiation-induced DNA double-strand breaks in peripheral lymphocytes, measured by pulsed-field gel electrophoresis from 52 patients with SLE and a control group consisting of 48 sex- and age-matched healthy subjects. No difference in intrinsic RS was found among both groups. However, SLE patients with anaemia, increased erythrocyte sedimentation rate and those with positive result for anti-La/SSB and anti-RNP antibodies showed significantly higher DNA double-strand breaks than those without them. In our study, patients with SLE did not have a higher intrinsic RS than healthy subjects. According to these results, and with the caution of being a limited laboratory study, the use of radiotherapy should not be avoided in patients with SLE when it is clinically needed.
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