Hepatocellular Carcinoma Showing Tumor Shrinkage Due to an Abscopal Effect

We herein report a 63-year-old man who presented with left lower jaw pain and was diagnosed with hepatocellular carcinoma with bone metastases post-examination. All tumors grew after immunotherapy with atezolizumab and bevacizumab, and his jaw pain worsened. After palliative radiation therapy, however, the tumors shrank markedly, with no recurrence seen after stopping immunotherapy. To our knowledge, this is the first case in which a radiotherapy- and immunotherapy-mediated abscopal effect facilitated tumor shrinkage and immunotherapy discontinuation.