Provided herein is a compound, 1-(4-(3-amino-[1,2,3]triazolo[1,5-a]pyridin-4-yl)phenyl)-3-(3-chlorophenyl)urea, pharmaceutical compositions thereof, and crystal forms thereof. Also provided are particles (e.g., nanoparticles) comprising the compound, and pharmaceutical compositions thereof, that are mucus penetrating. Also provided herein are methods and kits for using the compound, and pharmaceutical compositions thereof, for treating and/or preventing diseases associated with abnormal or pathological angiogenesis and/or aberrant signaling of a growth factor (e.g., vascular endothelial growth factor (VEGF)), such as proliferative diseases (e.g., cancers, benign neoplasms, inflammatory diseases, autoimmune diseases) and ocular diseases (e.g., macular degeneration, glaucoma, diabetic retinopathy, retinoblastoma, edema, uveitis, dry eye, blepharitis, and post-surgical inflammation) in a subject in need thereof.