Treatment of Secondary Hemophagocytic Lymphohistiocytosis Associated With Diffuse Large B-cell Lymphoma Using Loncastuximab Tesirine As Lymphoma-Directed Therapy.

Three critically ill, chemotherapy-refractory patients with diffuse large B-cell lymphoma (DLBCL) received loncastuximab tesirine in conjunction with standard therapies for secondary malignancy-associated hemophagocytic lymphohistiocytosis (Mal-HLH). All patients were treated inpatient, with one requiring intubation on the day of administration. Each patient had an H-score >238, indicating a >98% probability of HLH. A significant reduction in ferritin levels was observed in two patients, and one patient achieved a complete response (CR). Loncastuximab tesirine demonstrated promise in managing Mal-HLH where previous treatments had failed. This study suggests that loncastuximab tesirine exhibits favorable activity and should be considered a valuable addition to the treatment options for Mal-HLH driven by DLBCL.
Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work.
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