CLDN4 and neoplasm: Overall uptake of [111In]anti-claudin-4 was significantly higher in Panc-1 compared with HT1080 tumours (14.3 ± 2.6 and 4.3 ± 3.0 % ID/g, respectively; P < 0.001) and was also higher compared to uptake of [111In]mIgG in Panc-1 (6.3 ± 0.8 % ID/g; P < 0.01) and HT1080 (5.4 ± 0.9 % ID/g; P < 0.01) tumours.