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370 Magnetic Resonance-Guided Focused Ultrasound Delivery of Polymeric Brain-Penetrating Nanoparticle MicroRNA Conjugates in Glioblastoma.

Addition of 4-1BB in third-generationCARs improves expansion, but this modification alone was insufficient for CD28-4-1BBz CARs to treat tumors without prior host lymphodepletion. CARs deficient in Lck signaling, however, significantly retarded tumor growth in immune-intact mice without prior lymphodepletion, and this was dependent on inclusion of 4-1BB in CAR design. To determine if deficient Lck signaling altered CAR vulnerability to Tregs, we lymphodepleted mice and transferred CARs 6 Tregs. Cotransfer was sufficient to abrogate the efficacy of CD28-4-1BBz CARs, whereas the efficacy of xCD28-4-1BBz CARs remained unperturbed.