Robert Anders, MD, PhD, Robert L. Ferris, MD, PhD, and Lauren L. Ritterhouse, MD, PhD, discuss biomarker testing in this CME/MOC activity titled "The Central Role of Biomarker Testing in Piecing Together the Immuno-Oncology Puzzle: Essential Guidance for Pathologists to Maximize the Potential of Cancer Immunotherapies." For the full presentation, downloadable Practice Aids, monograph, complete CME/MOC information, and to apply for credit, please visit us at http://bit.ly/2QAudYX. CME/MOC credit will be available until December 26, 2019.