Studies at the 66th ASH Annual Meeting highlight progress in preventing and treating blood cancers, including daratumumab reducing disease progression risk by half in high-risk multiple myeloma patients, acalabrutinib and venetoclax combination improving progression-free survival in untreated CLL patients, epcoritamab showing promise in relapsed/refractory CLL, genetic changes and elevated leukemia risk in Ground Zero first responders, and socioeconomic factors limiting access to stem cell transplants for AML patients.