IDH1 mutations in grade II astrocytomas are associated with unfavorable progression-free survival and prolonged postrecurrence survival. - Thon, Niklas; Eigenbrod, Sabina; Kreth, Simone; Lutz, Juergen; Tonn, Joerg-Christian; Kretzschmar, Hans; Peraud, Aurelia; Kreth, Friedrich-Wilhelm (Cancer (0008543X), 2012)