The number of CD20 positive cells/mm2 was significantly higher in CPFE ANA + (n = 7) (49.6 ± 7.1) and IPF ANA + (n = 9) (47,1 ± 6.4) compared to CPFE ANA- (n = 8) (6.2 ± 3.6), IPF ANA- (n = 19) (5.9 ± 1.6) and control lung samples (3.2 ± 1.1) (p < 0.05) (Table 3) . The gene discussed is BTG3; the disease is idiopathic pulmonary fibrosis.