59OPreliminary results on mechanisms of resistance to ALK inhibitors: A prospective cohort from the MATCH-R study

Background: ALK tyrosine kinase inhibitors (TKIs) have shown to be effective in the treatment of patients with ALK rearranged NSCLC. The clinical benefit is eventually limited by the acquisition of resistance to ALK TKIs by tumor cells. The study of the biological mechanisms implied in tumor progression can provide the rational for therapeutic strategies to overcome resistance.