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Over 40,000 women in the UK are diagnosed with breast cancer each year - and the rate is still increasing. Nonetheless mortality rates are falling, at least partly due to the NHS screening programme. But is screening leading to the over zealous treatment of some women, with surgeons removing pre-cancers that might never develop? Should limited resources be focused on detection, prevention or treatment? Tonight's speaker, leading breast cancer surgeon, Michael Baum, looks at the politics and ethics of breast cancer screening. Professor Baum chairs one of the largest breast cancer trials worldwide and set up the NHS Breast Screening Programme in 1987; after leaving the programme, Baum became an outspoken critic of mammography screening. In the chair is Daniel Glaser, neuroscientist at UCL.