Peripheral blood lymphocyte count, CD3+ count, percentage of CD3+, CD3+CD4+ count, and CD3+CD8+ count was lower in MDA5+ DM-ILD than in MDA5− DM-ILD− (all P < 0.001) as well as CD3−CD19+ count (P = 0.04). The gene discussed is CD4; the disease is interstitial lung disease.