Biodistribution studies with [177Lu]Lu-PP-F11N and RAD001 in the A431-CCK2R tumor mouse model revealed that only the receptor-specific tumor uptake was increased (11% IA/g versus 7%IA/g without RAD001), while the uptake in other tissues with physiological receptor expression, such as the gastrointestinal tract, remained unchanged. Here, CCKBR is linked to neoplasm.