This research project is a single-center, retrospective clinical exploration study. It aims to retrospectively analyze data from 20 patients with advanced duodenal adenocarcinoma who received third-line treatment with furquinelone combined with sintilimab, in order to determine the clinical efficacy and safety of this combination therapy in advanced duodenal cancer.

Inclusion Criteria:

• Patients must meet all of the following criteria to be eligible for inclusion:

Age between 18 and 80 years (inclusive); Imaging findings consistent with unresectable local advanced, recurrent or metastatic duodenal adenocarcinoma; Histologically confirmed unresectable local advanced, recurrent or metastatic duodenal adenocarcinoma; ECOG performance status 0-2; At least one measurable or evaluable lesion according to RECIST v1.1; Third-line or above treatment with the combination of sintilimab and furquimatinib.

Exclusion Criteria:

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Patients meeting any of the following criteria will be excluded:

Patients with incomplete clinical data or laboratory examination that affects statistical analysis; Patients who have had other malignant tumors in the past 5 years; Patients who have had arterial thrombotic diseases such as angina, myocardial infarction, and transient ischemic attack in the past 6 months; Patients who have received other types of anti-tumor or experimental treatment; Pregnant or lactating women; Patients with other diseases or abnormal mental status that may affect the patient's treatment; Patients who have received other types of immune therapy, anti-angiogenic drugs, or small-molecule tyrosine kinase inhibitors.

This study will include patients with advanced duodenal adenocarcinoma who received third-line or above treatment with the combination of furquimatinib and sintilimab in Renji Hospital from January 2019 to the present.