C. InVivo-jet PEI - formulated 2'-O-MOE-PS/PO miR-10b inhibitor or non-targeting control were infused to orthotopic GL261 tumors by osmotic pumps, starting at day 6 after cell implantation. The uptake of ASOs was confirmed by IHC for PS-containing oligonucleotides (green). GL261 tumor cells expressing M-Cherry are red. 