moderately significantp < 0.001
Our study revealed a moderately significant relationship of miR-21 with cf-DNA (r = 0.786, p < 0.001); indicating their positive roles in SLE activity, while a considerable negative association of miR-21 with miR-146a and (r = − 0.404, p = 0.01); indicating the miR-21 clear correlation with the activity of SLE.