Boundless Bio CEO Discusses Oncology Breakthroughs at Leerink Conference Zachary Hornby, CEO of Boundless Bio, highlighted the company's innovative cancer therapies targeting extrachromosomal DNA during a fireside chat at the Leerink Global Healthcare Conference on March 12. The firm is advancing its leading candidate, BBI-355, currently in Phase 1/2 trials, aiming to address oncogene amplified cancers.12