Thirty-six patients with jSLE, 13 juvenile dermatomyositis (JDM) inflammatory controls, and nine healthy controls had Fas, FasL, TRAIL, TNFR1, Bcl-2, Bax, Bim, and caspase-3 expressions in NK cells (CD3−CD16+CD56+) simultaneously determined by flow cytometry. The gene discussed is FAS; the disease is juvenile dermatomyositis.