Provided herein are methods for treating and/or preventing hepatocellular carcinoma (HCC) characterized by hepatitis B virus (HBV) infection in a patient, comprising administering an effective amount of 7-(6-(2-hydroxypropan-2-y1)pyridin-3-y1)-1-((trans)-4-methoxycyclohexyl)-3,4-dihydropyrazino[2,3-b]pyrazin-2(1H)-one or a pharmaceutically acceptable salt or tautomer thereof (collectively referred to herein as "Compound 1") to the patient having HCC characterized by HBV infection.