Long-term complete response to lenvatinib in a patient with unresectable hepatocellular carcinoma.

A 36-year-old man had been diagnosed with a solitary hepatocellular carcinoma in the right lobe of the liver by computed tomography, and right hemihepatectomy was performed 16 years previously. Approximately 13 years later, he underwent partial hepatectomy because of intrahepatic recurrence in segment 4. Multinodular intrahepatic recurrences in the remnant liver were identified 19 months after repeat hepatectomy, and he underwent transcatheter arterial chemoembolization therapy. Ultimately, six transcatheter arterial chemoembolization therapies were required because of multiple repeat multinodular intrahepatic recurrences. The patient was refractory to transcatheter arterial chemoembolization, and therefore, he participated in a trial of lenvatinib monotherapy. At lenvatinib initiation, his liver function was Child-Pugh class A. Enhanced abdominal computed tomography detected four tumors in the remnant liver. Enhanced abdominal computed tomography findings at the first evaluation showed no residual contrast uptake on arterial phase images, corresponding to a complete response according to Response Evaluation Criteria in Solid Tumors at 4 months after initiation of lenvatinib. The patient was able to continue long-term lenvatinib therapy with well-controlled general health, and he maintained a complete response for two years and three months. Here, we describe his clinical course and radiological results during lenvatinib monotherapy.