ZYNLONTA® (loncastuximab tesirine-lpyl) net sales of $16.6 million in 4Q 2023 and $69.1 million for full year (FY) 2023; 4Q sales grew sequentially in both academic and community settings Focused pipeline progressing with continued LOTIS-7 dose escalation, screening patients for ADCT-601 targeting AXL in pancreatic cancer, and advancing differentiated solid tumor research platform FY 2023 operating expenses decreased 21%1 year-over-year due to portfolio prioritization and operational efficiencie