CCK and neoplasm: Nevertheless, previously performed biodistribution studies of [177Lu]Lu-DOTA-PP-F11N and [177Lu]Lu-DOTA-CCK-66 using the same parameters (AR42J-tumor bearing CB17-SCID mice, same activity and precursor amounts) revealed significantly higher activity levels in the tumor at 24 h p.i. for the latter (1.88 ± 0.82%ID/g versus 8.56 ± 1.08).