No significant differences were identified between subtypes for race, percent predicted forced vital capacity (FVC%) or diffusing capacity of the lung for carbon monoxide (DLCO%), smoking status, or treatment status, but patients with SSc-ILD and IPAF were younger at time of sampling and patients with IPF were predominantly male which is in line with previously reported cohorts [13]. This evidence concerns the gene NLRC4 and idiopathic pulmonary fibrosis.