SST and cancer: Native SRIF expression was found to correlate strongly with receptor expression in the same tissue compartments in both benign and malignant tumours, as follows: stromal sst1 (P=0.008), epithelial sst1 (P<0.001), stromal sst2 (P=0.019), vascular sst2 (P=0.026), epithelial sst3 (P=0.026), stromal sst5 (P=0.013) and vascular sst5 (P=0.038).