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The molecular mechanisms of Clo-induced tumor cell death were analyzed using western blotting, ELISA, reverse transcription-PCR, immunofluorescence, co-immunoprecipitation (CO-IP), short hairpin RNA, co-culture, chromatin immunoprecipitation, and flow cytometry. Clinical data sets were used to analyze the correlation between stimulator of interferon genes (STING)-NF\u03baB signaling and immune infiltration.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In this study, Clo significantly reduced the growth of melanoma and lung cancer cells. Furthermore, Clo treatment induced GSDME-mediated pyroptosis. Most importantly, Clo administration dramatically increased the cytotoxic activity of CD8\n                      <jats:sup>+<\/jats:sup>\n                      T cells in vitro and in vivo. Mechanistically, the administration of Clo induced the interaction of P53 with STING, which activated the non-canonical STING-NF\u03baB pathway; consequently, NF-\u03baB directly bound to the promoter regions of its target genes, including CCL5, CXCL10, HLAs and BAX. This resulted in apoptosis, pyroptosis, and immunogenic cell death in tumor cells by Clo. Furthermore, Clo-induced GSDME-mediated pyroptosis partly assists in activating T cell immunity via CCL5 and CXCL10. The non-canonical STING-NF-\u03baB pathway is the crucial signaling pathway that initiates and links apoptosis, pyroptosis, and immunogenic cell death.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      Our study is the first to show that Clo, an FDA-approved drug, induces tumor cell apoptosis, GSDME-related pyroptosis, and CD8\n                      <jats:sup>+<\/jats:sup>\n                      T-cell antitumor activity via the non-canonical P53-STING-NF-\u03baB signaling pathway, providing a novel strategy for the clinical therapy of melanoma and lung cancer.\n                    <\/jats:p>\n                  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