Macrophages were phenotyped by flow cytometry using M1 and/or M2 specific markers and, finally, PD-L1 expression was assessed by quantitative flow cytometry and immunoblot analysis.<h4>Results</h4>We demonstrate that CPZ, alone or in combination with temozolomide (TMZ), the current standard of care, activates the cGAS-STING signaling pathway, thus promoting anti-tumor immune responses. The gene discussed is STING1; the disease is neoplasm.