ATX-1905 is a positron emission tomography (PET) tracer that demonstrates good autotaxin ( ATX ) binding specificity and achieves semiquantification of lung ATX expression levels, which are elevated in fibrotic lungs. ATX-1905 exhibits elevated uptake in Bleomycin -induced pulmonary fibrosis (BPF) lungs. ATX-1905 is promising for research of idiopathic pulmonary fibrosis (IPF).