A 55-year-old man presents to the clinic with a 3-month history of fatigue, weight loss, and abdominal discomfort. He has a history of chronic hepatitis B infection. On examination, he has mild hepatomegaly and jaundice. Blood tests reveal elevated liver enzymes and alpha-fetoprotein levels. An ultrasound of the abdomen shows a 3 cm lesion in the right lobe of the liver. What is the most likely diagnosis?