IMMUNO-BIL is a non-comparative randomized 1:1 phase II study. This study will assess the efficacy and safety of the combination of durvalumab plus tremelimumab with or without weekly paclitaxel in patients with advanced BTC after failure of platinum-based chemotherapy. On the 25th June 2019, the maximum DLT event number was reached (6/10) in the durvalumab plus tremelimumab combination with paclitaxel Arm (Arm B). According to the Pocock boundary described in the protocol, GERCOR has updated the study to discontinue enrollment in Arm B (durvalumab plus tremelimumab with paclitaxel) . No safety concerns were raised by the IDMC in Arm A. Consequently, the study will resume with Arm A (durvalumab plus tremelimumab) only, without randomization. Discontinuation of ARM B(June 2019): Durvalumab plus tremelimumab plus paclitaxel One cycle equals 4 weeks (D1=D28); Durvalumab: 1,500 mg by IV infusion on D1, until progression or unacceptable toxicity or withdrawal of consent. Tremelimumab: 75 mg by IV infusion on D1 for the first 4 cycles. Paclitaxel: 80 mg/m2, every week for 3 weeks (D1-D8-D15), by IV infusion, until progression or unacceptable toxicity or withdrawal of consent (at least 6 cycles, at the discretion of the investigator). December 2020: Tremelimumab dosage modification based on the results of the Study 22 study (Kelley RK, et al. ASCO20 Virtual Scientific Program 2020) showing increased efficacy (response rate and progression-free survival) without safety concerns with one dose of tremelimumab 300 mg (cycle 1) instead of four doses of 75 mg (cycle 1 to cycle 4) in combination with durvalumab 1,500 mg Q4W in hepatocellular carcinoma. Following these results, we have changed the tremelimumab 75 mg x 4 schedule for the 300 mg x 1 schedule. The inclusion of 106 additional patients will be required to adequately evaluate the efficacy of this administration schedule. ARM A : Durvalumab plus tremelimumab ( patients included before 31/12/2020) One cycle equals 4 weeks (D1=D28); Durvalumab: 1,500 mg by IV infusion on D1, until progression or unacceptable toxicity or withdrawal of consent. Tremelimumab: 75 mg by IV infusion on D1 for the first 4 cycles.
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Overall Survival (OS) in amended Arm A
Timeframe: At 6 months