Maharjan, Ruby Choi, Jeong Uk Kweon, Seho Pangeni, Rudra Lee, Na Kyeong Park, Seong Jin Chang, Kwan-Young Park, Jin Woo Byun, Youngro 2024-01-19T12:33:29Z 2024-01-19T12:33:29Z 2022-04-29 2022-02 0142-9612 https://pubs.kist.re.kr/handle/201004/115642 In this study, we investigated the immune-modulating effects of a novel metronomic chemotherapy (MCT) featuring combined oral oxaliplatin (OXA) and pemetrexed (PMX) for colon cancer. OXA and PMX were ionically complexed with lysine derivative of deoxycholic acid (DCK), and incorporated into nanoemulsions or colloidal dispersions, yielding OXA/DCK-NE and PMX/DCK-OP, respectively, to improve their oral bioavailabilities. MCT was not associated with significant lymphotoxicity whereas the maximum tolerated dose (MTD) afforded systemic immunosuppression. MCT was associated with more immunogenic cell death and tumor cell MHC-class I expression than was MTD. MCT improved the tumor antigen presentation of dendritic cells and increased the number of functional T cells in the tumor. MCT also helped to enhance antigen-specific memory responses both locally and systemically. By combining MCT with anti-programmed cell death protein-1 (alpha PD-1) therapy, the tumor volume was suppressed by 97.85 & PLUSMN; 84.88% compared to the control, resulting in a 95% complete response rate. Upon re-challenge, all tumor-free mice rejected secondary tumors, indicating the induction of a tumor specific memory response. Thus, MCT using an OXA and PMX combination, together with alpha PD-1, successfully treated colon cancer by activating both innate and adaptive immune cells and elicited tumor-specific long-term immune memory while avoiding toxicity caused by MTD treatment. English Pergamon Press Ltd. A novel oral metronomic chemotherapy provokes tumor specific immunity resulting in colon cancer eradication in combination with anti-PD-1 therapy Article 10.1016/j.biomaterials.2021.121334 1 BIOMATERIALS, v.281 BIOMATERIALS 281 Y scie scopus 000779511500001 2-s2.0-85122090338 Engineering, Biomedical Materials Science, Biomaterials Engineering Materials Science Article ION-PAIRING COMPLEX OXALIPLATIN CYCLOPHOSPHAMIDE EFFICACY Oral metronomic chemotherapy Tumor microenvironment Immune checkpoint blockade Complete response Immunogenic cell death Tumor-specific immune memory