Tissue Biopsy Clinical Trials

• Patients must have histologically or cytologically confirmed intrahepatic cholangiocarcinoma (iCCA) that is resectable by imaging evaluation. Choice of staging modality is left up to the discretion of the treatment team; we favor high-quality CT scan of the chest/abdomen/pelvis with liver or biliary protocol. Eligibility will be confirmed through central imaging review.

• Patients must have measurable disease, defined as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded for non-nodal lesions and short axis for nodal lesions) as \>= 10 mm (\>= 1 cm) with CT scan, MRI, or calipers by clinical exam.

• Patients must be an acceptable risk surgical candidate at the time of enrollment, as determined by a board-certified surgeon with expertise in hepatobiliary surgery.

• High-risk iCCA is defined as the presence of any of these factors:

‣ Tumor size \> 5 cm.

⁃ Multifocality or satellitosis limited to the same lobe.

⁃ Vascular invasion.

⁃ Suspected or confirmed (via biopsy) regional lymph node metastases.

∙ Suspected is defined as lymph nodes that are deemed suspicious for metastasis based on large size (criteria vary per anatomical location; 6-10 mm for abdominal and 8-10 mm for pelvic), enhancement pattern, and shape. These may also include lymph nodes that display fludeoxyglucose F 18 (FDG)-avidity on positron emission tomography (PET) scan, if obtained, in the course of disease work-up (not mandatory).

⁃ CA 19-9 \> 200 U/mL.

• Patients are treatment naïve for iCCA.

• Age \>= 18 years. Because no dosing or adverse event data are currently available on the use of durvalumab (MEDI4736) in combination with cisplatin and gemcitabine in patients \< 18 years of age, children are excluded from this study.

• Body weight \> 30 kg.

• Eastern Cooperative Oncology Group (ECOG) performance status =\< 1 (Karnofsky \>= 70%).

• Leukocytes \>= 3,000/mcL.

• Hemoglobin \>= 9.0 g/dL.

• Absolute neutrophil count \>= 1,500/mcL.

• Platelets \>= 100,000/mcL.

• Neuropathy grade =\< 1 by CTCAE.

• Albumin \>= 2.8 g/dL.

• Serum bilirubin =\< 1.5 x institutional upper limit of normal (ULN).

• Aspartate aminotransferase (AST)(serum glutamic oxaloacetic transaminase \[SGOT\]) / alanine aminotransferase (ALT)(serum glutamic pyruvic transaminase \[SGPT\]) =\< 3 × institutional ULN.

• Serum creatinine =\< 1.5 x institutional ULN.

• Measured creatinine clearance \> 60 mL/min or glomerular filtration rate (GFR) \>= 60 mL/min/1.73 m\^2 (by the Cockcroft-Gault equation).

• Evidence of post-menopausal status or negative urinary or serum pregnancy test for female pre-menopausal patients. Women will be considered post-menopausal if they have been amenorrheic for 12 months without an alternative medical cause. The following age-specific requirements apply:

‣ Women \< 50 years of age would be considered post-menopausal if they have been amenorrheic for 12 months or more following cessation of exogenous hormonal treatments and if they have luteinizing hormone and follicle-stimulating hormone levels in the post-menopausal range for the institution or underwent surgical sterilization (bilateral oophorectomy or hysterectomy).

⁃ Women \>= 50 years of age would be considered post-menopausal if they have been amenorrheic for 12 months or more following cessation of all exogenous hormonal treatments, had radiation-induced menopause with last menses \> 1 year ago, had chemotherapy-induced menopause with last menses \> 1 year ago, or underwent surgical sterilization (bilateral oophorectomy, bilateral salpingectomy or hysterectomy).

• Life expectancy \>= 12 weeks.

• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial.

• For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated.

• Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load.

• Patients with treated brain metastases are eligible if follow-up brain imaging after central nervous system (CNS)-directed therapy shows no evidence of progression.

• Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial. If non-protocol anticancer agents for non-study indications is required concurrently with the protocol therapy, the case should be discussed and approved by the study chair and the sponsor (Cancer Therapy Evaluation Program \[CTEP\]).

• Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, patients should be class 2B or better.

• Ability to understand and the willingness to sign a written informed consent document. Legally authorized representatives may sign and give informed consent on behalf of study participants.