As shown in Table 3, anti-CFFCHAP fine specificities were more frequent in the RA-ILD group (anti-CFFCHAP-IgG 64.9% vs. 50.4%; anti-CFFCHAP-IgA 48.6% vs. 28.4%; anti-CFFCHAP-IgM 35.1% vs. 19.8%). This evidence concerns the gene CD79A and interstitial lung disease.