An extra chromosome 9 derived from either a normal chromosome 9 or a derivative chromosome 9 in a patient with acute myeloid leukemia positive for t(9;11)(p21.3;q23.3): A case report. - Gao, Man; Pang, Hui; Kim, Young Mi; Lu, Xianglan; Wang, Xianfu; Lee, Jiyun; Wang, Mingwei; Meng, Fanzheng; Li, Shibo (Oncology Letters, 2019)