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Actuarial overall survival after palliative reirradiation stratified by SPS score (Kaplan-Meier estimate): group 1 (n = 23), median not reached; group 2 (n = 26), median 6.7 months; group 3 (n = 38), median 4.1 months; P = 0.26 for group 2 versus 3 and P < 0.05 for other comparisons.
