A team of researchers at the University of British Columbia investigated the potential of radiopharmaceutical therapy based on Terbium-161 (161Tb) both in vitro and in vivo using a novel tracer, [161Tb]Tb-BL34L20S, which uses the C-X-C chemokine receptor type 4 (CXCR4)-targeting peptide BL34L20S labeled to 161Tb.