A Phase 3b research study to consolidate the data that ivosidenib is safe and effective in adult patients with previously treated, locally advanced, or metastatic cholangiocarcinoma (CCA). All patients who meet inclusion criteria will be enrolled to receive ivosidenib tablets orally once daily for 28 day cycles, continuing as long as clinical benefit and consent for participation is maintained. There will be a minimum of 6 study visits from screening until the final follow-up, if one cycle of treatment is completed and consent is maintained through 18 months of follow-up. Each additional cycle completed will add one study visit, on the first day of each cycle.

Ivosidenib is approved in the United States and in EU for the treatment of advanced or metastatic CCA; this study is being conducted to conslidate the data related to the safety, efficacy, and impact on quality of life for patients. This is an open-label, single-arm study of ivosidenib, which means that all patients meeting eligibility criteria will receive two 250 mg ivosidenib tablets, totaling 500mg of drug, to be taken orally, once daily, for 28 consecutive days, also referred to as one cycle. Additional cycles can continue as long as clinical benefit is confirmed by an investigator, and consent is maintained. There will be a screening visit, study visit on day 1 of each cycle, withdrawal visit within 42 days of stopping treatment, and a follow-up visit every 6 months for up to 18 months after stopping treatment. This results in a minimum of 6 study visits for the completion of one 28-day cycle of ivosidenib. One additional study visit will be added on day one of each additional cycle of treatment. Study visits will include an electrocardiogram (ECG), physical exam, tumor assessment, according to local practive at a given site and blood and urine analyses. If at any point ivosidenib is made available as a medical prescription at the patient's site, patients will be withdrawn from the study treatment and patients will be followed to collect data on overall survival.

Inclusion Criteria:

• Diagnosis of nonresectable or metastatic Cholangiocarcinoma (CCA), not eligible for curative-intent resection, transplantation, or ablative therapies
• Have a documented IDH1 R132C, R132L, R132G, R132H, or R132S gene-mutated disease
• Have tried at least 1 prior type of systemic therapy for CCA, and have recovered from any side effects
• Female patients of childbearing potential must have a negative blood pregnancy test prior to starting treatment and must agree to use 2 forms of contraception from the time they enroll to 1 month after their last dose of study drug
• Male patients with a female partner with childbearing potential must also agree to use 2 forms of contraception from the time they enroll to 1 month after their last dose of study drug

Exclusion Criteria:

• Received a prior IDH1 inhibitor
• Have received a transplant
• Have received systemic cancer treatment or radiotherapy within 2 weeks prior to Day 1 of Cycle 1
• Have received hepatic radiation, chemoembolization, and radiofrequency ablation within 4 weeks prior to Day 1 of Cycle 1
• Have ongoing brain metastases requiring steroids
• Have underwent major surgery within 4 weeks of Day 1 of Cycle 1 prior to C1D1
• Have an active hepatitis B (HBV) or hepatitis C (HCV) infections, known positive human immunodeficiency virus (HIV) antibody results, or acquired immunodeficiency syndrome (AIDS) related illness
• Are pregnant or breastfeeding

Qualified scientific and medical researchers can request access to anonymized patient-level and study-level clinical trial data.

Access can be requested for all interventional clinical studies:

• used for Marketing Authorization (MA) of medicines and new indications approved after 1 January 2014 in the European Economic Area (EEA) or the United States (US).
• where Servier is the Marketing Authorization Holder (MAH). The date of the first MA of the new medicine (or the new indication) in one of the EEA Member States will be considered for this scope.

In addition, access can be requested for all interventional clinical studies in patients:

• sponsored by Servier
• with a first patient enrolled as of 1 January 2004 onwards
• for New Chemical Entity or New Biological Entity (new pharmaceutical form excluded) for which development has been terminated before any Marketing authorization (MA) approval.

After Marketing Authorization in EEA or US if the study is used for the approval.

Researchers should register on Servier Data Portal and fill in the research proposal form. This form in four parts should be fully documented. The Research Proposal Form will not be reviewed until all mandatory fields are completed.

All patients, care providers, investigators, and outcomes assessors will know that each patient is taking the active study drug, ivosidenib.