ADC Therapeutics SAPhase 3 trial showed higher deaths in Zynlonta arm, leading to 66.56% stock drop.

Pomerantz LLP is investigating claims on behalf of investors of ADC Therapeutics SA concerning potential securities fraud or unlawful business practices. The investigation follows ADC's June 3, 2026 announcement of topline data from its Phase 3 LOTIS-5 confirmatory trial evaluating ZYNLONTA in combination with rituximab for relapsed or refractory diffuse large B-cell lymphoma. Although the treatment extended progression-free survival by 1.4 months, 27 deaths were recorded in the Zynlonta arm compared to nine deaths in the immunotherapy arm. ADC's stock price fell $2.05 per share, or 66.56%, over the following two trading sessions to close at $1.03 per share on June 5, 2026.
ADC Therapeutics SAPhase 3 trial showed higher deaths in Zynlonta arm, leading to 66.56% stock drop.