1257PKEYNOTE-151: A phase Ib study of second-line pembrolizumab (Pembro) for Chinese patients (pts) with advanced or metastatic melanoma. (23rd October 2018) - Si, L; Zhang, X; Shu, Y; Pan, H; Wu, D; Liu, J; Lou, F; Wang, X; Wen, X; Gu, Y; Zhu, L; Lan, S; et al.