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The prostate cancer conundrum revisited
Cancer,  Clinical Article

Etzioni R et al. – Changes in primary treatment explained a minority of the observed decline in prostate cancer mortality. The remainder of the decline probably was because of other interventions, such as prostate–specific antigen screening and advances in the treatment of recurrent and progressive disease.

Methods
  • The authors applied 3 independently developed models of prostate cancer natural history and disease detection under common assumptions about treatment patterns, treatment efficacy, and survival in the population.
  • Primary treatment patterns were derived from the Surveillance, Epidemiology, and End Results registry; data on the frequency of hormone therapy were obtained from the CaPSURE (Cancer of the Prostate Strategic Urologic Research Endeavor) database; and treatment efficacy was based on estimates from randomized trials and comparative effectiveness studies of treatment alternatives.
  • The models projected prostate cancer mortality without prostate-specific antigen screening and in the presence and absence of treatment benefit.
  • The impact of primary treatment was expressed as a fraction of the difference between observed mortality and projected mortality in the absence of treatment benefit.

Results
  • The 3 models projected that changes in treatment explained 22% to 33% of the mortality decline by 2005.
  • These contributions were accounted for mostly by surgery and radiation therapy, which increased in frequency until the 1990s, whereas hormone therapies contributed little to the mortality decline by 2005.
  • Assuming that treatment benefit was less for older men, changes in treatment explained only 16% to 23% of the mortality decline by 2005.

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