BRCA2 and neoplasm: Tumor accumulation of thorium-227 was observed out to 336 h, with a measured uptake of 42 ± 4% and 59 ± 10% injected activity per gram (% IA/g) tumor for the DLD-1 parental (Figure 3A) and DLD-1 BRCA2 -/- respectively (Figure 3C).