PDGFRB and age-related macular degeneration: Although synergistic antiproliferative effects of PDGF/PDGFR inhibitors, such as imatinib and olaratumab, and classical cytotoxic agents (i.e., AMD, cisplatin) were observed in both in vitro and in vivo experiments, the effects of these inhibitors on drug-resistant cells have not been explored.