4‐phenylbutyric acid promotes hepatocellular carcinoma via initiating cancer stem cells through activation of PPAR‐α oleh Shu‐Zhen Chen, Yan Ling, Le‐Xing Yu, Yu‐Ting Song, Xiao‐Fei Chen, Qi‐Qi Cao, Han Yu, Can Chen, Jiao‐Jiao Tang, Zhe‐Cai Fan, Yu‐Shan Miao, Ya‐Ping Dong, Jun‐Yan Tao, Satdarshan P.S. Monga, Wen Wen, Hong‐Yang Wang