The study looks at a protein called SERPINB3 that helps pancreatic cancer cells avoid a new type of cell death called cuproptosis and also makes them hide from the immune system. Researchers found that blocking the pathways SERPINB3 uses could improve cancer treatments, but the work is purely pre‑clinical and involves complex drug delivery systems, not something that can be used by everyday health enthusiasts.

Cuproptosis, a newly identified form of cell death, is closely linked to copper homeostasis and protein lipoylation. Using a multi-omics approach, we firstly reveal that SERPINB3 confers cuproptosis resistance in pancreatic cancer and functions as a theranostic biomarker. Mechanistically, SERPINB3 inhibits FDX1 transcription by activating the MAPK signaling pathway, thereby conferring cuproptosis resistance. We further demonstrated that SERPINB3 directly interacts with MEK1, impeding its chaperone-mediated autophagic degradation, which ultimately leads to sustained activation of the MAPK signaling pathway. Additionally, we found that SERPINB3 promotes pancreatic cancer immune evasion by upregulating PD-L1 expression on tumor cells. This phenomenon motivated the development of a triple-combination strategy consisting of MAPK inhibition, cuproptosis induction, and αPD-1 therapy for pancreatic cancer patients with high SERPINB3 expression. To this end, we further developed a metal-organic framework (MOF) loaded with both copper ions and MEK inhibitor, which significantly triggers tumor-specific cuproptosis and enhances antitumor immunity. In summary, SERPINB3 serves as a predictive biomarker to inform therapeutic strategies targeting cuproptosis, thereby establishing a novel paradigm for cancer immunotherapy that integrates metal biology, targeted therapy, and immune modulation.