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Clinical Activity and Tolerability of SL-401 (Tagraxofusp): Recombinant Diphtheria Toxin and Interleukin-3 in Hematologic Malignancies

Division of Medical Oncology, Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, USA
Author to whom correspondence should be addressed.
Biomedicines 2019, 7(1), 6;
Received: 20 November 2018 / Revised: 26 December 2018 / Accepted: 3 January 2019 / Published: 5 January 2019
(This article belongs to the Special Issue Immunotoxins: Future Advances and Directions)
PDF [604 KB, uploaded 5 January 2019]


Overcoming the leukemia stem cell resistance to intensive chemotherapy has been an area of extensive research over the last two decades. Advances and greater understanding of the molecular biology of leukemia stem cells are in rapid progress. Targeted therapies are currently being used in clinical practice with reasonable response rates, but a cure is being achieved in only a small percentage of patients, most likely due to tumor mutational heterogeneity. A genetically engineered diphtheria toxin fused with interleukin-3 (SL-401 or tagraxofusp) has shown robust activity in blastic plasmacytoid dendritic cell neoplasm and promising response rates in different myeloid malignancies, including eradication of minimal residual disease. Multiple clinical trials are being conducted using this drug and the preliminary results are encouraging. This article reviews the clinical trials for SL-401, its mechanism of action, clinical activity, and the adverse event profile. View Full-Text
Keywords: SL-401 (tagraxofusp); diphtheria immunotoxin; adverse events; Myeloid neoplasms SL-401 (tagraxofusp); diphtheria immunotoxin; adverse events; Myeloid neoplasms

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Alkharabsheh, O.; Frankel, A.E. Clinical Activity and Tolerability of SL-401 (Tagraxofusp): Recombinant Diphtheria Toxin and Interleukin-3 in Hematologic Malignancies. Biomedicines 2019, 7, 6.

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