Tumour uptake of [111In]anti-claudin-4 mAb in Panc-1 xenografts at 72 h p.i. was markedly higher than the maximum value reported by Foss and co-workers in the same model (4 % ID/g at 48 h p.i.), probably due to the superior kinetic stability of the radioimmunoconjugate [45]. Here, CLDN4 is linked to neoplasm.