Gemcitabine/Cisplatin/Nab-Paclitaxel and Rilvegostomig in Resectable iCCA

Inclusion Criteria: 1. Patient must be capable of providing written informed consent. 2. Age \>18 years at time of study entry 3. Histologically proven intrahepatic cholangiocarcinoma 4. Complete surgical resection of the tumor must be achievable\*. Resection should include a portal lymphadenectomy as per standard of care. 5. No prior cytotoxic, targeted or immune therapy 6. Have provided archival tumor tissue sample or preferably freshly obtained biopsy of a tumor lesion not previously irradiated for mandatory pre-treatment evaluation (baseline). 7. Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1 8. Estimated life expectancy \>3 months 9. Exclusion of distant metastases by CT or MRI of abdomen, pelvis, and thorax, bone scan or MRI (if bone metastases are suspected due to clinical signs). Exclusion of the infiltration of any adjacent organs or structures by CT or MRI, indicating an unresectable situation 10. If underlying liver cirrhosis, Childs Pugh score of 5 or 6 11. If underlying liver disease, ALBI grade ≤2† 12. Patients with HBV infection, which is characterized by positive hepatitis B surface antigen (HBsAg) and/or hepatitis B core antibodies (anti-HBcAb) with detectable HBV DNA (≥10 IU/ml or above the limit of detection per local lab standard), must be treated with antiviral therapy, as per institutional practice, to ensure adequate viral suppression (HBV DNA ≤2000 IU/mL) prior to study entry. Patients must remain on antiviral therapy for the study duration and for 6 months after the last dose of study medication. Patients who test positive for anti-hepatitis B core (HBc) with undetectable HBV DNA (\<10 IU/ml or under limit of detection per local lab standard) do not require anti-viral therapy prior to study entry. These subjects will be tested at every cycle to monitor HBV DNA levels and initiate antiviral therapy if HBV DNA is detected (≥10 IU/ml or above the limit of detection per local lab standard). HBV DNA detectable subjects must initiate and remain on antiviral therapy for the study duration and for 6 months after the last dose of study medication. 13. Patients with HCV infection must have management of this disease per local institutional practice throughout the study. HCV diagnosis is characterized by the presence of detectable HCV ribonucleic acid (RNA) or anti-HCV antibody upon enrollment. 14. Evidence of post-menopausal status or negative serum pregnancy test for female pre-menopausal patients. 15. Adequate normal organ and marrow function as defined below within screening period: * Haemoglobin ≥9.0 g/dL * Absolute neutrophil count (ANC ≥1.0 × 109 /L) * Platelet count ≥100 × 109/L * Serum bilirubin ≤1.5 x institutional upper limit of normal (ULN). \<\<This will not apply to patients with confirmed Gilbert's syndrome (persistent or recurrent hyperbilirubinemia that is predominantly unconjugated in the absence of hemolysis or hepatic pathology), who will be allowed only in consultation with their physician. * AST (SGOT)/ALT (SGPT) ≤5 x institutional upper limit of normal. * Measured creatinine clearance (CL) \>50 mL/min or Calculated creatinine clearance CL\>50 mL/min by the Cockcroft-Gault formula (Cockcroft and Gault 1976) or by 24-hour urine collection for determination of creatinine clearance: Males: Creatinine CL (mL/min) = Weight (kg) x (140 - Age) 72 x serum creatinine (mg/dL) Females: Creatinine CL (mL/min) = Weight (kg) x (140 - Age) x 0.85 72 x serum creatinine (mg/dL) * Albumin ≥2.8g/dl * International normalized ratio ≤1.5 (for patients receiving Warfarin, please consult with the study physician) 16. Patient is willing and able to comply with the protocol for the duration of the study including undergoing treatment and scheduled visits and examinations including follow up. * Resectability is at the discretion of the investigators at each site but must be discussed at a multidisciplinary tumour board. * based on albumin and bilirubin; ALBI score = (log10 bilirubin \[umol/L\] x0.66) + (albumin \[g/L\] x -0.0852). ALBI grade 1= score ≤ -2.60. Exclusion Criteria: Patients should not enter the study if any of the following exclusion criteria are fulfilled at time of study enrolment or where indicated: 1. Locally unresectable tumor or metastatic disease: 1. Radiological evidence suggesting inability to resect with curative intent whilst maintaining adequate vascular inflow and outflow 2. Radiological evidence of direct invasion into adjacent organs. 3. Radiological evidence of extrahepatic metastatic disease (except regional lymph nodes - stations 9 and 12 2. Contraindication to any of the study drugs 3. Any concurrent chemotherapy, investigational product, biologic or hormonal therapy for cancer treatment 4. Are currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks or for a period of at least 5 half-lives of the respective drug/IMP (whichever is longer) before screening and during Screening for this trial. 5. Have a diagnosis of immunodeficiency or are receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug. 6. Have a known additional malignancy that is progressing or has required active treatment within the past 2 years. Note: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin or carcinoma in situ (e.g., breast carcinoma, cervical cancer in situ) that have undergone potentially curative therapy are not excluded. 7. Have active autoimmune disease that has required systemic treatment in the past 2 years (i.e., with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment and is allowed. 8. Have a history of (non-infectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease. 9. Have an active infection requiring systemic therapy (exception: HBV and HCV infection). 10. Have a history of Human Immunodeficiency Virus (HIV) (mandatory testing for HIV during screening is required). 11. Have known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial. 12. Female patients who are pregnant or breastfeeding or male or female patients of reproductive potential who are not willing to employ highly effective birth control from screening to 6 months after the last dose of study treatment. Not engaging in sexual activity, per the patient's preferred and usual lifestyle, for the total duration of the treatment and 6 months after the last dose of study treatment is an acceptable practice. Note: Females of childbearing potential are defined as those who are not surgically sterile (ie, bilateral salpingectomy, bilateral oophorectomy, or complete hysterectomy) or not post menopausal. 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. * 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, or had chemotherapy-induced menopause with last menses \>1 year ago. * Women who are surgically sterile (i.e., bilateral salpingectomy, bilateral oophorectomy, or complete hysterectomy) are eligible. Highly effective methods of contraception, defined as one that results in a low failure rate (i.e., less than 1% per year) when used consistently and correctly. Note that some contraception methods are not considered highly effective (e.g., male or female condom with or without spermicide; female cap, diaphragm, or sponge with or without spermicide; non copper containing intrauterine device; progestogen-only oral hormonal contraceptive pills where inhibition of ovulation is not the primary mode of action \[excluding Cerazette/desogestrel, which is considered highly effective\]; and triphasic combined oral contraceptive pills). Serum levels of contraceptive hormones may be altered by concomitant use of other drugs. Therefore, drug interactions should always be considered when prescribing hormonal contraception; there could be a risk of contraceptive failure or other adverse effects. 13. Legal incapacity or limited legal capacity.