SystImmune's Iza-bren Hits Phase 3 Dose in Global Lung Cancer Trial
Seoul – September 12, 2026 -- SystImmune, Inc. announced that new global Phase 1 data support 2.5 mg/kg D1D8 Q3W as the recommended Phase 3 dose for iza-bren (izalontamab brengitecan), a bispecific EGFRxHER3 antibody drug conjugate, in previously treated EGFR-mutated metastatic non-small cell lung cancer (NSCLC).
Randomized Phase 1 cohort confirms higher efficacy at the 2.5 mg/kg dose level
The abstract, presented in an oral session at the IASLC 2026 World Conference on Lung Cancer (WCLC) in Seoul, South Korea, evaluated iza-bren across three dose levels in a randomized dose-expansion cohort. Patients enrolled had EGFR-mutated metastatic NSCLC and had previously received a third-generation EGFR inhibitor. Results showed promising antitumor activity with a manageable safety profile, with the highest efficacy observed at the 2.5 mg/kg dose.