Edited by Lucio Frydman, Weizmann Institute of Science, Rehovot, Israel, and accepted by Editorial Board Member Angela M. Gronenborn February 16, 2021 (received for review July 11, 2020)There is an unmet clinical need for sensitive methods for detecting cell death in vivo, for example, in disease and following tumor treatment. We show here that deuterium magnetic resonance measurements at 7 T of labeled malate production from injected 2H-labeled fumarate provide a sensitive method for detecting tumor cell death in vivo following treatment. Malate production was relatively slow in viable...…Edited by Lucio Frydman, Weizmann Institute of Science, Rehovot, Israel, and accepted by Editorial Board Member Angela M. Gronenborn February 16, 2021 (received for review July 11, 2020)There is an unmet clinical need for sensitive methods for detecting cell death in vivo, for example, in disease and following tumor treatment. We show here that deuterium magnetic resonance measurements at 7 T of labeled malate production from injected 2H-labeled fumarate provide a sensitive method for detecting tumor cell death in vivo following treatment. Malate production was relatively slow in viable...WW…