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Immunohistochemical detection of the receptor for urokinase plasminogen activator in human colon cancer

Paraffin‐wax embedded specimens from 30 cases of colonic adenocarcinoma were investigated for immunoreactivity for the receptor of urokinase‐type plasminogen activator (uPAR). In all cases there was a strong signal, predominantly at the invasive foci. The positive cells were mainly tumour‐infiltrating macrophages but neutrophils and eosinophils were also strongly stained. The neoplastic cells were positive in 19 of the samples with staining of occasional or a moderate number of cells. In uninvolved, normal‐appearing mucosa adjacent to the malignant infiltrates, immunostaining of both macrophages and neutrophils was seen, but the labelling was less intense than that seen in the malignant lesions. Weak to moderate staining of normal intestinal epithelium was also seen at the luminal surface. Comparison between immunoreactivity and in situ hybridization showed a similar distribution of protein and mRNA with two exceptions: first, neutrophils (strongly immunoreactive for uPAR) were negative or only weakly positive for uPAR mRNA; and second, many cancer cells at invasive foci showed prominent hybridization signals but no detectable uPAR immunoreactivity. Together with previous findings of urokinase plasminogen activator (uPA) protein and mRNA being expressed in tumour‐infiltrating fibroblast‐Iike cells at the invasive foci, these results support the view that the uPA pathway of plasminogen activation is involved in tissue degradation in colon cancer. The results also extend and consolidate an emerging picture of non‐neoplastic tumour stromal cells producing molecules involved in the generation and regulation of extracellular proteolysis in cancer.