Abstract
Maspin, SCCA1/2 and hurpin were identified by cDNA microarray analyses as dramatically differentially expressed transcripts in primary non-small cell lung cancer (NSCLC). These sequences are located within a 10-gene serpin cluster on 18q21.3. Using comparative RT–PCR, we have investigated the expression of each of these serpins, including their flanking loci, in an independent NSCLC series. Whereas six of the genes (maspin, SCCA1, SCCA2, hurpin, megsin and pAI-2) were commonly differentially expressed in primary lesions, each significantly more often in squamous cell tumours, maspin was identified as the most frequently over-represented sequence in both squamous cell carcinoma and adenocarcinoma. Using a well-characterized monoclonal antibody, we have shown strong maspin expression in tumour protein extracts, detected multiple isoforms of the 42 kDa protein and shown that maspin is localized specifically to the tumour cells within neoplastic lesions. In contrast, most cells in non-neoplastic lung tissue appear not to express the gene, with the exception of the multipotent basal epithelial cells that line the bronchial airway. These reserve cells generally show strong predominantly nuclear localization of maspin. Strong nuclear expression of maspin within primary tumour cells is correlated with increased survival (P=0.05) and a longer remission duration (P=0.02) in resectable-staged patients. However, within the airways of cancer patients and somewhat in contrast to this observation, such expression was more frequently detected in the superficial cells of preneoplastic over non-neoplastic epithelia (P<0.0001), consistent with a role for the protein in early neoplasia.
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Acknowledgements
We thank the clinical teams in Liverpool and Bern for their assistance in the collection and processing of patient tissues. We also thank the patients for allowing us to use such material for our research. This work was funded by the Roy Castle Lung Cancer Foundation, UK, the Swiss Cancer League (KFS-703-8-1998) and the Bernese Cancer League.
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Smith, S., Watson, S., Ratschiller, D. et al. Maspin – the most commonly-expressed gene of the 18q21.3 serpin cluster in lung cancer – is strongly expressed in preneoplastic bronchial lesions. Oncogene 22, 8677–8687 (2003). https://doi.org/10.1038/sj.onc.1207127
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DOI: https://doi.org/10.1038/sj.onc.1207127
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