Single-Domain Antibody Nuclear Imaging Allows Noninvasive Quantification of LAG-3 Expression by Tumor-Infiltrating Leukocytes and Predicts Response of Immune Checkpoint Blockade. - Lecocq Q; Awad RM; De Vlaeminck Y; de Mey W; Ertveldt T; Goyvaerts C; Raes G; Thielemans K; Keyaerts M; Devoogdt N; Breckpot K (Journal of nuclear medicine : official publication, Society of Nuclear Medicine, 2021)