Der Internist
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The transfusion of chimeric antigen receptor (CAR) T‑cells has become established as a new treatment option in oncology; however, this is regularly associated with immune-mediated side effects, which can also run a severe course and necessitate a specific treatment and intensive medical treatment. ⋯ Potentially severe complications regularly occur after CAR T-cell therapy. An interdisciplinary cooperation between intensive care physicians, hematologists, neurologists and specialists in other disciplines is of decisive importance for the optimal care of patients after CAR T‑cell therapy.