ArticleCancers2026
DNA Methyltransferase Inhibitors, Decitabine and Guadecitabine Overcome Immune-Checkpoint Blockade Resistance and Achieve Tumor Regression in the E0771 and 4T1 Murine Models of Triple-Negative Breast Cancer.
Article in Cancers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundImmune-checkpoint blockade (ICB) is a recent addition to the treatment options for breast cancer, especially the triple-negative (TNBC) subset. Inhibiting immunosuppressive factors in the tumor microenvironment (TME) and preventing or reversing T cell exhaustion may increase the likelihood of a response to ICB. We have shown that decitabine and guadecitabine, DNA methyltransferase inhibitors (DNMTi), prevent the systemic and TME accumulation of myeloid-derived suppressor cells (MDSCs), which are immunosuppressive.
resultsHere, we show that adding DNMTi to the neoadjuvant + adjuvant ICB-based treatment of ICB-resistant 4T1 and E0771 murine tumors in Balb/C and C57Bl/6 mice, respectively, effectively reduced the tumor burden, with 52% of 4T1 tumors completely regressing across several studies. DNMTi-based therapy overcame ICB resistance (ICBR) in a selected subline of E0771, and treated tumors showed a reduction in MDSCs. We also show that, in E0771, DNMTi can overcome ICBR to multiple checkpoint inhibitors, and in 4T1, it can modulate anti-tumor immunity by enhancing central memory T cell (Tcm) formation and reducing T cell exhaustion.
conclusionThese pre-clinical findings support the further investigation of incorporating DNMTi as a new immunotherapy modality for TNBC.
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