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Evaluation of prostate-specific antigen declines for surrogacy in patients treated on SWOG 99-16: Petrylak DP, Ankerst DP, Jiang CS, Tangen CM, Hussain MH, Lara PN Jr, Jones JA, Taplin ME, Burch PA, Kohli M, Benson MC, Small EJ, Raghavan D, Crawford ED, C