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When conventional supportive measures (transfusions and hematopoietic growth factors) fail, alternative strategies are urgently needed. We report the case of a 55\u2010year\u2010old man who developed persistent cytopenias after idecabtagene vicleucel. Reinfusion of cryopreserved autologous stem cells (stem cell boost), administered without conditioning chemotherapy, resulted in rapid and complete hematopoietic recovery after 14\u2009days. This case highlights the potential of stem cell boost as a salvage approach for prolonged post\u2010CAR\u2010T hematotoxicity and underscores the need for prospective multicenter studies to standardize indications, timing, and procedures for this intervention.<\/jats:p>","DOI":"10.1155\/crh\/1558475","type":"journal-article","created":{"date-parts":[[2026,6,5]],"date-time":"2026-06-05T05:49:42Z","timestamp":1780638582000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Outpatient Rescue With Stem Cells Boost for Refractory Hematotoxicity Following anti\u2010BCMA CAR T\u2010Cell Therapy: A Case 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