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Overall survival. Kaplan-Meier estimator for PROSTVAC (a vaccine containing two recombinant viral vectors [vaccinia and fowlpox] and three immune co-stimulatory molecules [B7.1, ICAM-1, and LFA3]) arm is shown as a solid gold line and estimator for the control arm is a dashed blue line. The small vertical tic marks show the censoring times. The estimated median overall survival is 25.1 months for the PROSTVAC arm and 16.6 months for the control arm.
