Legend Biotech Establishes Clinical Proof-of-Concept for LB2501 in Relapsed/Refractory B‑Cell Non‑Hodgkin Lymphoma on June 16, 2026 CD19/CD20 dual-targeting CAR-T Favorable Frequency of Responses in vivo LB2501 Legend Biotech Lymphodepletion Therapy Phase I Clinical Trials relapsed/refractory B-cell non-Hodgkin lymphoma safety profile +