Blood test could spot Immunotherapy-Linked liver damage

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria for patients in the CHILI group: * Patient \> 18 years old * Patient treated with immune checkpoint inhibitors (ICI) alone or in combination * Patient suffering from Hepatitis secondary to immune checkpoint inhibitors (ICI) grade 3 or 4 Common Terminology Criteria For Adverse Events (CTCAE)\* * Treatment with corticosteroids or Ursodeoxycholic acid (UDCA) not started, or started less than 30 days ago * Grade 3 or 4 hepatitis: increase in transaminases and/or alkaline phosphatases ≥ 5 x Upper Limit of Normal (ULN) or total bilirubin ≥ 3 Inclusion criteria for patients in the control group: * Patient \> 18 years old * Patient suffering from Primary Biliary Cholangitis (PBC)\* or Autoimmune Hepatitis (AIH)\*\* or Primary Sclerosing Cholangitis (PSC) \*\*\* Primary Biliary Cholangitis (PBC)\* diagnosis : Association of at least 2 of the following 3 criteria : * Cholestasis (PAL \> 1.5N, Gamma GT \> 3N) chronic (\> 6 months) without ultrasound abnormality of the bile ducts. * M2 type anti-mitochondria Ab \> 1/40th * Characteristic histological lesions (non-suppurative destructive cholangitis) or compatible (portal inflammation, granulomas, ductular proliferation, ductopenia, cholestasis). \*\* AIH diagnosis : ALT \> 5 N / Ig G \> 1.5 - 2 N or anti-smooth muscle ≥ 1/80 / Interface hepatitis of marked intensity The Hepactic Activity Index (HAI) score makes it possible to confirm the diagnosis when all the diagnostic criteria are not met. \*\*\* PSC diagnosis: presence of chronic cholestasis (alkaline phosphatase \> 1.5 N or GGT \> 3 N) and typical abnormalities of the bile ducts on cholangio-MRI (Magnetic Resonance Imaging), and in the absence of cause of secondary sclerosing cholangitis * Treatment with corticosteroids or Ursodeoxycholic acid (UDCA) not initiated, or started less than 30 days ago Non-inclusion criteria: * Impossibility of following the patient during the study period * Liver biopsy not possible * Other hepatitis diagnoses * Failure to obtain consent * Unemancipated minors, people unable to express their consent * Non-affiliation to a social security or equivalent scheme, * Persons placed under judicial protection, * Person participating in another research including a period of exclusion still in progress. * Pregnant or breastfeeding women * De novo or old diagnosis (at the time of a flare-up)