[CARs, CRS and neurotoxicity: severe complications after administration of immunotherapy : Essentials for intensivists].

Background The development of chimeric antigen receptor (CAR) T‑cells has shown promising results in relapsed/refractory B‑cell acute lymphoblastic leukemia/lymphoma (B-ALL) and diffuse large cell B‑cell lymphoma. Complications, especially cytokine release syndrome (CRS) and CAR T‑cell related encephalopathy syndrome (CRES), can be life threatening. The management of both plays a key role in CAR T‑cell therapy. Objectives Diagnosis, clinical presentation and development of complications in the treatment with CAR T‑cells. Materials and methods Summary of incidence, mortality and treatment of severe complications after administration of CAR T‑cells referring to current studies and therapy recommendations. Results Complications after administration of CAR T‑cells, especially CRS and CRES, can be life threatening. The timely identification of side effects and their appropriate treatment usually leads to complete recovery. Conclusions Using a therapy algorithm in the treatment with CAR T‑cells allows safe management of toxicities and can be helpful in recognizing them in time.