A Phase 3b, Open-label, Multi-center Study on Durvalumab in Combination With Gemcitabine-based Chemotherapy as 1L Treatment for the Chinese Patients With Unresectable Biliary Tract Cancers (BTC)

Exclusion Criteria

• •1. Ampullary carcinoma.
• •2. As judged by the investigator, any evidence of diseases (such as severe or uncontrolled systemic diseases, including uncontrolled hypertension, active bleeding diseases, active infection, active ILD/pneumonitis, serious chronic gastrointestinal conditions associated with diarrhoea, psychiatric illness/social situations), history of allogenic organ transplant, which, in the investigator's opinion, makes it undesirable for the participant to participate in the study or that would jeopardise compliance with the protocol.
• •3. Active or prior documented autoimmune or inflammatory disorders including inflammatory bowel disease \[eg, colitis or Crohn's disease\], diverticulitis \[with the exception of diverticulosis\], systemic lupus erythematosus, Sarcoidosis syndrome, or Wegener syndrome \[granulomatosis with polyangiitis\], Graves' disease, rheumatoid arthritis, hypophysitis, uveitis, etc). The following are exceptions to this criterion:
• •* Participants with vitiligo or alopecia.
• •* Participants with hypothyroidism (eg, following Hashimoto syndrome) stable on hormone replacement.
• •* Any chronic skin condition that does not require systemic therapy.
• •* Participants without an active disease in the last 5 years may be included but only after consultation with the study physician.
• •* Participants with celiac disease controlled by diet alone.
• •* Participants with ≥ Grade 2 lymphopenia will be evaluated on a case-by- case basis after consultation with the study physician
• •4. History of another primary malignancy, except for malignancy treated with curative intent and with no known active disease ≥ 5 years before the first dose of study intervention and of low potential risk for recurrence, basal cell carcinoma of the skin, squamous cell carcinoma of the skin or lentigo maligna that has undergone potentially curative therapy, or adequately treated carcinoma in situ without evidence of disease.
• •5. History of leptomeningeal carcinomatosis.
• •6. History of active primary immunodeficiency.
• •7. Known to have tested positive for HIV (positive HIV 1/2 antibodies) or active tuberculosis infection (clinical evaluation that may include clinical history, physical examination and radiographic findings, or tuberculosis testing in line with local practice).
• •8. Participants co-infected with HBV (presence of HBsAg and/or anti-HBcAb with detectable HBV DNA, as per local laboratory standards) and HCV (presence of anti-HCV antibodies), or coinfected with HBV and HDV (presence of anti-HDV antibodies).
• •9. Persistent toxicities (CTCAE Grade \> 2) caused by previous anticancer therapy; alopecia and vitiligo are excluded toxicities.
• •* Participants with Grade ≥ 2 neuropathy will be evaluated on a case-by-case basis after consultation with the study physician.
• •* Participants with irreversible toxicity not reasonably expected to be exacerbated by treatment with durvalumab may be included only after consultation with the study physician.
• •10. History of previous or current, brain metastases or spinal cord compression (including asymptomatic and adequately treated disease). Participants with suspected brain metastases at screening should have an MRI (preferred) or CT scan, each preferably with IV contrast of the brain prior to study entry.
• •11. Known allergy or hypersensitivity to any of the study intervention or any of the study intervention excipients.
• •12. Any concurrent chemotherapy, other than the one allowed in the study, IP, biologic, or hormonal therapy for cancer treatment. Concurrent use of hormonal therapy for non-cancer-related conditions (eg, hormone replacement therapy) is acceptable.
• •13. Palliative radiotherapy with a limited field of radiation within 2 weeks of the first dose of study intervention, or radiotherapy with a wide field of radiation or radiotherapy affecting more than 30% of the bone marrow within 4 weeks before the first dose of study intervention. Prior locoregional therapy, such as radioembolization, is allowed as long as done more than 2 weeks prior.
• •14. Receipt of live attenuated vaccine within 30 days prior to the first dose of study intervention (see Appendix J). Enroled participants should not receive live vaccine while receiving study intervention and up to 30 days after the last dose of IP.
• •15. Major surgical procedure (as defined by the investigator) within 28 days prior to the first dose of IP. Minor surgery of isolated lesions for palliative intent is acceptable if performed more than 14 days prior to the first dose of IP.
• •16. Prior exposure to immune-mediated therapy including, but not limited to, other anti-CTLA-4, anti-PD-1, anti-PD-L1, and anti-PD-L2 antibodies, excluding therapeutic anticancer vaccines.
• •17. Current or prior use of immunosuppressive medication within 14 days before the first dose of durvalumab. The following are exceptions to this criterion:
• •* Intranasal, inhaled, or topical steroids or local steroid injections (eg, intra-articular injection).
• •* Systemic corticosteroids at physiologic doses not to exceed 10 mg/day of prednisone or its equivalent.
• •* Steroids as premedication for hypersensitivity reactions (eg, CT scan premedication).
• •18. Receipt of the last dose of anticancer therapy (chemotherapy, targeted therapy, biologic therapy, or mAbs) within 28 days prior to the first dose of study intervention or 5 half-lives of the respective study intervention, whichever is longer.
• •19. Participation in another clinical study with a study intervention administered in the last 3 months.
• •20. Concurrent enrolment in another clinical study, unless it is an observational (non-interventional) clinical study, or during the follow-up period of an interventional study.
• •21. Prior randomisation or study intervention in a previous durvalumab clinical study, regardless of study intervention arm assignment.
• •22. Involvement in the planning and/or conduct of the study (applies to both AstraZeneca staff and/or staff at the study site).
• •23. Female participants who are pregnant or breastfeeding or male or female participants of reproductive potential who are not willing to use effective birth control from screening to 90 days after the last dose of study intervention with durvalumab or 180 days after the last dose of durvalumab and gemcitabine-based therapy.
• •24. Judgement by the investigator that the participant should not participate in the study if the participant is unlikely to comply with study procedures, restrictions, and requirements.