PAF1 and neoplasm: When transferring from normal to tumour-xenografted mice, no significant change in uptake of 225Ac-PD2 in other organs was observed except for stable average uptake of 4.3 ± 1.5% ID/g in bones comparing to slightly increasing uptake (from 5.9 ± 1.2% ID/g to 8.4 ± 1.3% ID/g, between 3 and 7 days p.i.)in the case of normal mice.