Piperlongumine selectively kills glioblastoma multiforme cells via reactive oxygen species accumulation dependent JNK and p38 activation - Liu, J M; Pan, F; Li, L; Liu, Q R; Chen, Y; Xiong, X X; Cheng, K; Yu, S B; Yu, A CH; Chen, X Q (Biochem Biophys Res Commun, 2013)