Successful Treatment of Metastatic Gallbladder Carcinoma with PD-L1 Expression by the Combination of PD-1 Inhibitor Plus Bevacizumab with Chemotherapy: A Case Report.

Gallbladder cancer (GBC) is the most common type of biliary tract cancer. The GBC is often diagnosed at an advanced stage, which limits surgical intervention due to its aggressive nature, and as a consequence of its insensitivity to chemotherapy, more effective treatments are required. In GBC, the efficacy of chemotherapy combined with anti-PD-L1/VEGF inhibition remains to be clarified. The present case report describes successful treatment by toripalimab in combination with bevacizumab and gemcitabine in a patient with metastatic GBC and PD-L1 combined positive score (CPS) =30. After six courses of therapy, a partial response was observed in the patient's clinical condition. So far, her PFS has exceeded 15 months. To the best of our knowledge, there was no other case where toripalimab plus bevacizumab were used in combination with gemcitabine as an effective treatment strategy for GBC. The remarkable response is likely to be related to the positive expression of PD-L1. Further, VEGF inhibition in combination with chemotherapy may result in improved clinical outcomes due to increased antitumor immunity. Chemotherapy regimens combined with anti-PD-L1/VEGF inhibition are promising therapies for GBC. Further well-designed prospective clinical trials are needed in order to confirm the efficacy and safety of the three-drug regimen.