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Spanish researchers sequence non-infiltrating bladder cancer exome
Date:10/19/2013

Bladder cancer represents a serious public health problem in many countries, especially in Spain, where 11,200 new cases are recorded every year, one of the highest rates in the world. The majority of these tumours have a good prognosis -- 70-80% five-year survival after diagnosis -- and they do not infiltrate the bladder muscle at the time of diagnosis -- in around 80% of cases.

Despite this, many of the tumours recur, requiring periodic cytoscopic tumour surveillance. This type of follow-up affects patients' quality of life, at the same time as incurring significant healthcare costs.

Researchers at the Spanish National Cancer Research Centre (CNIO), coordinated by Francisco X. Real, head of the Epithelial Carcinogenesis Group and Nuria Malats, head of the Genetic & Molecular Epidemiology Group, have carried out the first exome sequencing for non-infiltrating bladder cancer, the most frequent type of bladder cancer and the one with the highest risk of recurrence (the exome is the part of the genome that contains protein synthesis information).

The results reveal new genetic pathways involved in the disease, such as cellular division and DNA repair, as well as new genes -- not previously described -- that might be crucial for understanding its origin and evolution.

"We know very little about the biology of bladder cancer, which would be useful for classifying patients, predicting relapses and even preventing the illness", says Cristina Balbs, a predoctoral researcher in Real's laboratory who is the lead author of the study.

The work consisted of analysing the exome from 17 patients diagnosed with bladder cancer and subsequently validating the data via the study of a specific group of genes in 60 additional patients.

"We found up to 9 altered genes that hadn't been described before in this type of tumour, and of these we found that STAG2 was inactive in almost 40% of the least aggressive tumours", says Rea
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Contact: Nuria Noriega
comunicacion@cnio.es
Centro Nacional de Investigaciones Oncologicas (CNIO)
Source:Eurekalert  

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Spanish researchers sequence non-infiltrating bladder cancer exome
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