GR-389988 (a.k.a. GZ389988) is a neurotrophic receptor tyrosine kinase/Trk inhibitor that was developed by Genzyme. It blocks nerve growth factor (NGF)/Trk pathway activation. The chemical structure is claimed in Genzyme's patent US9174986B2
for utility in the treatment of inflammatory diseases, autoimmune disease, defects of bone metabolism and/or cancer, and especially for the management of osteoarthritis and osteoarthritis pain. GR-389988 also inhibits c-FMS, the cellular receptor for colony stimulating factor-1 (CSF-1).