IGF1 and idiopathic pulmonary fibrosis: All the MR results showed that the IGF-1 had no significant genetic correlation with IPF (OR, 1.100, 95% CI, 0.794-1.525, P=0.568 for IVW; OR, 1.102, 95% CI, 0.912-1.292, P=0.535 for maximum likelihood; OR, 1.284, 95% CI, 0.794-1.774, P=0.321 for simple median; OR, 1.729, 95% CI, 0.783-3.821, P=0.177 for MR Egger; OR, 1.423, 95% CI, 0.862-2.349, P=0.168 for weighted median, respectively).