At ASH 2015, Dr. Wei Ding from the Mayo Clinic in Rochester discusses her abstract titled "PD-1 Blockade with Pembrolizumab (MK-3475) in Relapsed/Refractory CLL Including Richter Transformation: An Early Efficacy Report from a Phase 2 Trial (MC1485)." For more oncology news, education, and information, please visit http://www.oncology.tv/