NT5C3A and neoplasm: Tumour uptake of [18F]rucaparib in PSN1 xenografts was measured to be 5.49 ± 0.49%ID/g and 2.2 ± 0.34%ID/g at 1 and 2 h post-administration, respectively, with tumour-to-blood (T/B) ratios of 1.53 ± 0.11 and 4.33 ± 2.1, suggesting relatively slow tumour clearance compared with blood and liver clearances.