tokens: Pharmacokinetic analyses in 21 patients revealed Pirarubicin plasma T 1 / 2 alpha ( + / - SE ) of 2 . 5 + / - 0 . 85 minutes , T beta 1 / 2 of 25 . 6 + / - 6 . 5 minutes , and T 1 / 2 gamma of 23 . 6 + / - 7 . 6 hours .