Our previous studies have validated PDGFRβ-targeted PET using the radiolabeled Affibody molecule Z09591 (also known in the literature as ATH001) for detecting fibrogenic cells in liver fibrosis models, suggesting its potential for translation to pulmonary fibrosis (PF) and other fibrotic diseases (Wegrzyniak et al. 2023, 2024). The gene discussed is PDGFRB; the disease is pemphigus foliaceus.