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Missing breast cancer genes may soon be discovered

We are closer to finding the missing 80% of breast cancer genes than ever before thanks to the success of the COSMIC database (Catalogue Of Somatic Mutations In Cancer) the 5th European Breast Cancer Conference (EBCC-5) was told today.

The genes BRCA1 and BRCA2 account for approximately 20% of the familial risk of breast cancer, leaving 80% to be explained. The COSMIC database developed at the Sanger Institute, Cambridge, UK was created in 2004 to provide free up to the minute genetic data to scientific communities and to prevent the duplication of research. The data in COSMIC has expanded to include data on 538 genes, 124,367 tumours with 23,157 mutations.

So far in genetic research 350 cancer genes have been identified and of these, 311 have a mutation in the somatic cell. Scientists believe that many somatic mutations are caused by a number of things the way that DNA repairs and maintains itself, or past exposure to a harmful substance such as a virus. Alternatively it may be a combination of both.

This for example could explain why some smokers get lung cancer and some don't there must be a combination of faulty gene and harmful exposure to tobacco smoke to activate the cancer cells.

The challenge for scientists is telling the difference between, say the 28 genes that are frequently mutated, beyond what would be expected by chance and are almost certainly cancer causing genes, and the 180 'bystander' genes which may be coincidentally involved. It's highly likely that some 'bystander' genes may turn out to be damaging as more researchers exploit this extraordinary free collection of data.

The data has been drawn together from the scientific literature on cancer cell lines (including those master lines held by the National Cancer Institute in the US) and tumour biopsy analysis. The information is stored in a standardised fashion to facilitate searching and compilation by anyone not expert in the area. Tissue samples a
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Contact: EBCC-5 Press Office
stephanie.makin@toniclc.com
33-49-392-8402
Federation of European Cancer Societies
22-Mar-2006


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