Rachna Shroff, MD, MS (IMAGE) University of Arizona Health Sciences Caption Rachna Shroff, MD, MS, led a team of researchers that examined the immune response following the first and second doses of the Pfizer-BioNTech COVID-19 vaccine in patients on immunosuppressive active cancer therapy, such as chemotherapy. Credit University of Arizona Health Sciences/Kris Hanning Usage Restrictions Editorial use only License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.