A recent study found a link between mRNA vaccination and improved cancer immunotherapy response. The preclinical data demonstrated impressive results, leading to big questions. “We believe that [vaccination] actually does generate and even converts the cold tumors to hot tumors,” Steven H. Lin, MD, PhD, a physician-scientist and radiation oncologist at the University of Texas MD Anderson Cancer Center in Houston, tells Robert A. Figlin, MD, the interim director of Cedars-Sinai Cancer Center in Los Angeles and Steven Spielberg Family Chair in Hematology-Oncology.