A prospective, observational study to explore multidimensional biomarkers for predicting the efficacy of immunotherapy In biliary tract tumors

Patient with unresectable advanced or metastatic biliary tract tumors will be enrolled and plan to receive PD-1/PD-L1 inhibitors combined with chemotherapy as first-line treatment. To explore the biomarkers, tumor tissues, acquired from puncture biopsies at baseline, will be collected and investigated by genomic panel sequencing , transcriptome sequencing, and mIHC. Meanwhile, baseline peripheral blood and feces were also collected for detection of plasma proteins, genomes, and metagenomes. Finally, the investigators will analysis and explore predictive biomarkers of immunotherapy in biliary tract tumors.

Inclusion Criteria:

1. Over 18 years old;
2. Imaging evaluation indicates unresectable advanced or metastatic biliary tract tumors (including intrahepatic cholangiocarcinoma, extrahepatic cholangiocarcinoma, and gallbladder carcinoma);
3. Confirmed as adenocarcinoma by histology;
4. Has not received systemic therapy in the past (patients who have not progressed within six months after the completion of neoadjuvant therapy or adjuvant therapy can be enrolled);
5. At least one measurable lesion according to RECIST 1.1 standard;
6. Plan to receive PD-1/PD-L1 inhibitors combined with chemotherapy as first-line treatment;
7. Sign informed consent, has good compliance and can cooperate with follow-up.

Exclusion Criteria:

1. Suffering from other active malignant tumors within 5 years or simultaneously; Unable to collect baseline plasma or tissue samples.

Patients with a pathological diagnosis of biliary tract tumors who have agreed to receive first-line PD-1/PD-L1 inhibitors combined with chemotherapy