The mechanisms by which melanoma and other cancer cells evade anti-tumor immunity remain incompletely understood.,Here, we show that the growth of tumors formed by mutant BrafV600E mouse melanoma cells in an immunocompetent host requires their production of prostaglandin E2, which suppresses immunity and fuels tumor-promoting inflammation.,Genetic ablation of cyclooxygenases (COX) or prostaglandin E synthases in BrafV600E mouse melanoma cells, as well as in NrasG12D melanoma or in breast or colorectal cancer cells, renders them susceptible to immune control and provokes a shift in the tumor inflammatory profile toward classic anti-cancer immune pathways.,This mouse COX-dependent inflammatory signature is remarkably conserved in human cutaneous melanoma biopsies, arguing for COX activity as a driver of immune suppression across species.,Pre-clinical data demonstrate that inhibition of COX synergizes with anti-PD-1 blockade in inducing eradication of tumors, implying that COX inhibitors could be useful adjuvants for immune-based therapies in cancer patients.,•Cyclooxygenase in tumors induces PGE2 that subverts myeloid cell function•COX ablation in tumors enables immune control•COX inhibition synergizes with checkpoint blockade therapy•A COX inflammatory signature is conserved across mouse and human cancer biopsies,Cyclooxygenase in tumors induces PGE2 that subverts myeloid cell function,COX ablation in tumors enables immune control,COX inhibition synergizes with checkpoint blockade therapy,A COX inflammatory signature is conserved across mouse and human cancer biopsies,Cyclooxygenase-driven prostaglandin E2, produced by a variety of tumors, drives malignant growth through successful evasion of type I interferon and/or T-cell-dependent tumor elimination.,A remarkable synergy between cyclooxygenase inhibitors and checkpoint blockade immunotherapy results in tumor eradication.
The incidence of melanoma is increasing worldwide, and the prognosis for patients with high-risk or advanced metastatic melanoma remains poor despite advances in the field.,A systematic literature review of treatments for advanced, metastatic disease was conducted to present the success of current treatments and the promise of those still in clinical development that may yield incremental improvements in the treatment of advanced, metastatic melanoma.,Advances in the understanding of the mechanism of chemotherapy resistance offer the hope for improved results with chemotherapy, and the triumvirate of more effective chemotherapy, immunotherapy, and targeted therapy are likely to be combined with one another for significant advances in melanoma over the coming few years.,The incidence of melanoma is increasing worldwide, and the prognosis for patients with high-risk or advanced metastatic melanoma remains poor despite advances in the field.,Standard treatment for patients with thick (≥2.0 mm) primary melanoma with or without regional metastases to lymph nodes is surgery followed by adjuvant therapy or clinical trial enrollment.,Adjuvant therapy with interferon-α and cancer vaccines is discussed in detail.,Patients who progress to stage IV metastatic melanoma have a median survival of ≤1 year.,Standard treatment with chemotherapy yields low response rates, of which few are durable.,Cytokine therapy with IL-2 achieves durable benefits in a greater fraction, but it is accompanied by severe toxicities that require the patient to be hospitalized for support during treatment.,A systematic literature review of treatments for advanced, metastatic disease was conducted to present the success of current treatments and the promise of those still in clinical development that may yield incremental improvements in the treatment of advanced, metastatic melanoma.