ADC Therapeutics SA announced positive results from the pivotal 145-patient Phase 2 clinical trial of loncastuximab tesirine (ADCT-402) for the treatment of relapsed or refractory diffuse large B-cell lymphoma (DLBCL). To date, loncastuximab tesirine has achieved an overall response rate (ORR) of 45.5% (66/145 patients), including 20% complete responses and 25.5% partial responses, across a broad population of relapsed or refractory DLBCL patients, even those who are difficult to treat. Comparably, the ORR in the 183-patient Phase 1 clinical trial of loncastuximab tesirine at the initial dose used in Phase 2 was 41.4% (29/70 patients), including 21.4% complete responses and 20% partial responses. Loncastuximab tesirine has demonstrated manageable toxicity in patients with relapsed or refractory DLBCL. The most common grade =3 treatment-emergent adverse events in the Phase 2 clinical trial were neutropenia, thrombocytopenia and increased gamma-glutamyltransferase. The single-arm, multi-center, open-label Phase 2 clinical trial evaluated the safety, efficacy and pharmacokinetics of loncastuximab tesirine as a monotherapy in patients with relapsed or refractory DLBCL. Patients received 30-minute intravenous infusions of loncastuximab tesirine once every three weeks at a dose of 150 µg/kg for the first two cycles, followed by 75 µg/kg for subsequent cycles for up to one year or until disease progression, unacceptable toxicity, or other discontinuation criteria, whichever occurred first.