The ILD group had higher proportions of patients with CD4 expression (47% vs. 29%, p = 0.036), Mx1 expression on immune cells (29% vs. 13%, p = 0.023), and expression of MHC class 1 (67% vs. 41%, p = 0.004) and HLA-DR on myofibers (37% vs. 11%, p = 0.001) than the non-ILD group. This evidence concerns the gene CD4 and interstitial lung disease.