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2 reasons may account for the rise in survival rates over 20 years: First, the establishment of widely used PSA testing resulted in a shift towards more favourable T categories due to the detection of many additional small tumours as well as the noticeable change in initial treatment strategy towards more radical prostatectomies. The second factor that likely increased survival was improvements in the therapies themselves.
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Dörr et al. (2015) studied this question.
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