Successful pembrolizumab treatment of microsatellite instability-high intrahepatic cholangiocarcinoma: A case report

Pembrolizumab is considered to be an effective therapy for patients with microsatellite instability (MSI)-high cancer. Here, we report a case of MSI-high cholangiocarcinoma effectively treated with pembrolizumab. MSI status should be actively evaluated in patients with cholangiocarcinoma.