Lenvatinib plus toripalimab as first-line treatment for advanced intrahepatic cholangiocarcinoma: A single-arm, phase 2 trial.

4099 Background: Lenvatinib monotherapy and lenvatinib plus PD-1 antibody have shown some clinical benefit for advanced intrahepatic cholangiocarcinoma (ICC) in the second-line setting. Our study assesses the role of lenvatinib plus toripalimab (PD-1 antibody) for advanced ICC patients as the first line therapy. Methods: Patients (pts) with locally advanced or metastatic ICC received 12 mg/day (Body Weight ≥60 kg) or 8 mg/day (Body Weight <60 kg) oral lenvatinib daily plus 240 mg intravenous toripalimab every 3 weeks. The primary endpoint was objective response rate (ORR) and evaluated according to Response Evaluation Criteria In Solid Tumors version 1.1 (RECIST v1.1). Secondary endpoints included safety, progression-free survival (PFS) and overall survival (OS). Treatment continued until confirmed disease progression, unacceptable toxicity, or voluntary withdrawal. This trial is registered with ClinicalTrials.gov (NCT04361331). Results: From March 2020 to Sep. 2020, 31 pathologically confirmed advanced ICC pts with a mean age of 58.4 (range, 25-73) years, including 18 women (58.0%), were enrolled at Zhongshan Hospital, Fudan University. At the end of last follow-up (February 10, 2021), the ORR was 32.3% (10/31; 95% CI: 16.7%-51.4%) and the disease control rate (DCR) was 74.2% (23/31; 95% CI: 55.4%-88.1%). Median follow-up was 6.9 months. Two pts with locally advanced disease were down-staged and then underwent resection. They remained disease-free survival at the end of last follow-up. 11 pts exerted disease progression and 7 pts died. The median PFS and OS have not been reached. Median duration of response (DOR) has not been reached and responses were ongoing in 9/10 (90.0%) pts at data cutoff. 6-months OS rate was 87.1%. No grade 5 adverse event (AE) was observed in present study. 32.3% (10/31) of pts experienced Grade 3 or higher AEs and 1 pts discontinued the treatment owing to severe fatigue. Conclusions: As the first-line therapy, lenvatinib plus toripalimab provided promising efficacy with reasonable safety profile in advanced ICC patients. It offered an alternative treatment for advanced ICC who cannot tolerate gemcitabine-based chemotherapy. Clinical trial information: NCT04361331.