1. Supplemental Fig 1 Rt. Lung Tumor A B Murine lung cancer model. LLC were implanted as described in Fig 1. A) Representative histology showing the distribution of tumor nodules on day 24. B) Representative H&E stained photomicrograph showing a tumor nodule (Bar = 500 μm).

2. Supplemental Fig 2 B Free CpG ODN (ng) 37.5 CpG on microparticles 75150300600 900 120018000 hr3 hr 24 hr48 hr A %ODN release Time (hr) C 1 μm Release of CpG ODN from CpG-MP. (A) Scanning electron photomicrograph showing a microparticle assembled after freeze-drying. CpG-MP were suspended in saline just before scanning. Bar = 1 μm. (B) Desorption of CpG ODN from CpG-MP was monitored by suspending particles in physiological saline (pH 7.4, 37o C). Supernatants were collected over time, loaded onto a 3% agarose gel, electrophoresed and visualized by staining with SYBR Gold. (C) The percent of ODN released was calculated by the formula: (measured ODN)/(total ODN used to formulate the CpG-MP) x100%. Results are representative of 3 independent experiments.

3. Supplemental Fig 3 Survival (%) Day TLR9 KO Rag1 KO ** No Rx (WT) CpG-MP i.t. No Rx Day Effect of CpG-MP on survival of LLC challenged mice. LLC were implanted and mice treated with CpG-MP as described in Fig 1. Survival curves were generated for TLR9 KO and Rag1 KO mice and analyzed by Kaplan-Meier statistics using the log-rank test. Data from 2-3 independent experiments involving 7-10 mice/group were combined to generate each survival curve. **, p < 0.01 vs No Rx (WT) (Kaplan Meier).

4. Supplemental Fig 4 UntreatedCpG-MP treated CD8 T cells M2-like macrophages Effect of CpG-MP on immune cells in LLC tumor. LLC were implanted and mice treated with CpG-MP as described in Fig 1. Lungs were collected on day 20. Photomicrographs compare portions of tumors from untreated vs CpG-MP treated mice. Sections were stained to detect CD3 +, CD8 + T cells (A,B) or F4/80 +, CD206 + M2 macrophages (C,D). Bar = 50 μm. A B C D

5. Supplemental Fig 5 A Rx on Day 18 Rx on Days 7, 14 No Rx B # of Apoptotic cells 10 0 10 1 10 2 10 3 10 4 # of CTL p < 0.01 r = 0.79 10 2 10 3 10 4 # of Apoptotic cells Immunosuppressive cell # p < 0.01 r = - 0.36 Correlation between cancer cell apoptosis and tumor infiltration by CTL vs immunosuppressive cells. LLC were implanted and mice treated as described in Fig 6. Lungs were collected on day 20. The number of apoptotic (TUNEL+) tumor cells is plotted against the number of A) CD3+ CD8+ CTL and (B) immunosuppressive cells (M2 macrophages plus Tregs) per mm2 of tumor. Data were derived by analyzing serial sections from a total of 15-39 tumors in 3 mice per group (One way Anova).