Abstract
Background
Development of secondary tumor after CART treatment is not well investigated. We report a pediatric B-cell acute lymphoblastic leukemia (B-ALL) patient who developed histiocytic sarcoma shortly after CART therapy.
Case report: A 9-year-old boy diagnosed with relapsed B-ALL presenting the KRAS A146T mutation received autologous mouse-derived CD19 and CD22 chimeric antigen receptor T-cell therapy at our center (Chinese Clinical Trial Registry: ChiCTR2000032211). Thirty days post-CART therapy, the bone marrow showed complete remission. At 85 days post-CART therapy, the boy presented with fever and chills. An abdominal CT scan showed massive hepatomegaly with multiple low-density lesions in the liver. At 130 days post-CART therapy, a bone marrow smear showed abnormal proliferation of macrophages, some of which exhibited phagocytosis. On day 136 post-CART therapy, laparoscopic liver biopsy was performed, revealing multiple yellow–white lesions on the surface of the liver. Microscopically, multifocal lesions were observed, predominantly composed of cells with abundant cytoplasm. Immunohistochemical staining indicated histiocytic origin. Based on the immunohistochemical results, histiocytic sarcoma was diagnosed. The same cytogenetic markers were identified in histiocytic sarcoma. Conclusion: Our case illustrates a rare complication after CART therapy. The diagnosis and treatment of histiocytic sarcoma pose many challenges.
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New findings: Chimeric antigen receptor T-cell therapy (CART) has emerged as a novel treatment modality for relapsed and refractory leukemia and lymphoma patients. The study of secondary tumor after CART treatment is limited. We report a pediatric B-ALL patient who developed histiocytic sarcoma shortly after CART therapy. In our study, the patient presented fever and liver mass shortly after CART cell therapy. The same cytogenetic markers (KRAS A146T) were identified in histiocytic sarcoma. Same cytogenetic markers have suggested a common clonal origin between primary hematolymphoid disorders and histiocytic sarcoma.
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An, K., He, Y., Tang, Y. et al. Histiocytic sarcoma following CAR T-cell therapy: a case report. Int J Hematol 119, 338–341 (2024). https://doi.org/10.1007/s12185-023-03695-8
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DOI: https://doi.org/10.1007/s12185-023-03695-8