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CpG oligonucleotides (ODN) stimulate the innate immune system by triggering cells that express TLR9. The resulting response promotes tumor regression, an effect optimized by delivery of CpG ODN to the tumor site. This work examines the effect of instilling CpG ODN adsorbed onto polyketal microparticles (CpG-MP) into the lungs of mice with non-small cell lung cancer. Intrapulmonary delivery of CpG-MP improved ODN uptake and retention at the tumor site, thereby inducing a stronger Th1 response than systemically administered or unadsorbed CpG ODN. CpG-MP reversed the immunosuppression that characterized the tumor microenvironment by (i) decreasing the number of immunosuppressive Tregs and M2 macrophages while (ii) increasing the number of tumoricidal CD8(+) T cells and M1 macrophages. These effects promoted tumor regression and culminated in 82% permanent survival of mice with otherwise fatal Lewis lung cancer.

Intrapulmonary Delivery of CpG Microparticles Eliminates Lung Tumors