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Potential Surrogate Endpoints for Prostate Cancer Survival
Clinical trials for prostate cancer that use surro-gate endpoints for prostate cancer-specific survival may require less time to complete. Ray et al. (p. 228) used data from the Radiation Therapy and Oncology Group 92-02 randomized trial and Prentice's four criteria for surrogacy to evaluate two potential surrogate endpoints for prostate cancer-specific sur-vival—distant metastasis and general clinical treatment failure. At 3 years, both distant metastasis and general clinical treatment failure were consistent with all four of Prentice's criteria for being surrogate endpoints for prostate cancer-specific survival at 10 years. At 5 years, prostate cancer-specific survival was not statistically significantly different between treatment arms of the randomized trial, so
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J Natl Cancer Inst 2009 101: 228-236.
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