after addition of MDA-MB-436 derived ApoEVs (treated with combination of KMTR2+lexatumumab DR5 agonists or IgG1) on to DR5-KO MDA-MB-231 cells, total lysates were immunoblotted for PD-L1 after 24 hrs. KMTR2+lexatumumab (n=3), IgG1 (n=2). 