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Degradation of extracellular matrix (ECM) and basement membranes is required for tumour cell invasion and metastasis. The ECM is degraded by matrix metalloproteinases (MMP) which are counteracted by tissue inhibitors of metalloproteinases (TIMP). In aggressive tumours the balance of proteolysis and antiproteolysis is disrupted, resulting in fast tumour progression and invasiveness. We examined MMP and TIMP expression patterns in bronchial washings of 58 consecutive lung tumour patients and 10 controls. Pathohistological investigations revealed squamous cell carcinoma (n = 23), adenocarcinoma (n = 18), small cell lung carcinoma (n = 9), and pulmonary metastases of extrapulmonary tumours (n = 8). MMP/TIMP expression was correlated to histology, location, or staging of tumours.

Distinct endobronchial expression of matrix-metalloproteinases (MMP) and their endogenous inhibitors in lung cancer