A Phase I Study of ADCT-402 (Loncastuximab Tesirine), a Novel Pyrrolobenzodiazepine-Based Antibody-Drug Conjugate, in Relapsed/Refractory B-Cell Non-Hodgkin Lymphoma.

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Kahl BS, Hamadani M, Radford J, Carlo-Stella C, Caimi P, Reid E, Feingold JM, Ardeshna KM, Solh M, Heffner LT, Ungar D, He S, Boni J, Havenith K, O'Connor OA

A Phase I Study of ADCT-402 (Loncastuximab Tesirine), a Novel Pyrrolobenzodiazepine-Based Antibody-Drug Conjugate, in Relapsed/Refractory B-Cell Non-Hodgkin Lymphoma.

Clin Cancer Res. 2019 Dec 1;25(23):6986-6994. doi: 10.1158/1078-0432.CCR-19-0711. Epub 2019 Nov 4.

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31685491 [ View in PubMed
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Abstract

PURPOSE: ADCT-402 (loncastuximab tesirine) is an antibody-drug conjugate comprising a CD19-targeting antibody and pyrrolobenzodiazepine dimers. A first-in-human study evaluated the safety and preliminary clinical activity of loncastuximab tesirine in patients with B-cell non-Hodgkin lymphoma (NHL). PATIENTS AND METHODS: A multicenter, phase I, dose-escalation and dose-expansion study enrolled patients ages >/=18 years with relapsed/refractory (R/R) B-cell NHL. Patients received loncastuximab tesirine every 3 weeks at doses assigned by a 3+3 dose-escalation design. Dose escalation was used to assess the safety and tolerability of loncastuximab tesirine to determine the dose for expansion. Secondary objectives evaluated clinical activity, characterized the pharmacokinetic profile, and evaluated antidrug antibodies. RESULTS: During dose escalation, 88 patients with R/R B-cell NHL were treated with loncastuximab tesirine at doses 15 to 200 mug/kg. Treatment-emergent adverse events (TEAEs) were experienced by 87/88 (98.9%) patients. Most common TEAEs (>/=20% of patients) were hematologic abnormalities, fatigue, edema, liver test abnormalities, nausea, rash, and dyspnea. Grade >/=3 TEAEs (>/=5% of patients) included hematologic abnormalities, liver test abnormalities, fatigue, and dyspnea. Overall response rate at doses >/=120 mug/kg was 59.4% (41 of 69 patients; 40.6% complete response; 18.8% partial response). Median duration of response, progression-free survival, and overall survival (all doses) were 4.8, 5.5, and 11.6 months, respectively. Drug exposure increased with increasing dose, showing moderate accumulation with multiple doses >/=150 mug/kg. There was no evidence of immunogenicity. CONCLUSIONS: Loncastuximab tesirine had promising activity with acceptable safety in this dose-escalation study. A phase II study with initial dosing at 150 mug/kg has been initiated based on these results.

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