Yau T, Kang Y-K, Kim T-Y, El-Khoueiry A, Santoro A, Sangro B, Melero I, Kudo M, Hou M-M, Matilla A, Tovoli F, Knox J, He A, El-Rayes B, Acosta-Rivera M, Lim H-Y, Neely J, Shen Y, Wisniewski T, Anderson J, Hsu C. Efficacy and Safety of Nivolumab Plus Ipilimumab in Patients With Advanced Hepatocellular Carcinoma Previously Treated With Sorafenib: The CheckMate 040 Randomized Clinical Trial. JAMA Oncol. 2020;6(11):e204564. PMCID: PMC7530824