LAUSR

e21574 Background: Immunomodulators are used in the treatment of patients with melanoma. However, their role as anticancer therapeutic agents requires further investigation. Azoximer bromide (AB) is a well-tolerated immunomodulator that has been used in cases of melanoma. We investigated the impact of AB when used concomitantly with other melanoma treatment modalities on the overall survival (OS) and time to progression (TTP). Methods: We reviewed per protocol, a single-center real practice database that included 1,391 patients. Forty-two patients had received AB as a concomitant therapeutic agent. Concomitant medications included immune checkpoint inhibitors, cytokines, vaccines, targeted therapy and surgery alone in the adjuvant or metastatic setting. We built Cox proportional-hazards models for OS and TTP stratified by stage in SPSS v19. All known prognostic factors (LDH, TNM stage and sub-stage, mutations, sex, age, therapy by type, and by immunologic action) were included in the model along with AB therapy. Known factors were separated from unknown (AB therapy) by different variable blocks. A step forward method was used for model construction. Results: Significant (p < 0.05) factors to emerge in the OS model were LDH (Hazards ration [HR]: 1.458 for high LDH), sub-stage (HR: 1.718 for M1b-d sub-stage), BRAF mutation (HR: 0.698 if present), current therapy type (HR: 0.501 for immune checkpoint inhibitors (ICI), HR: 0.656 for targeted therapy (TT), HR: 1.275 for systemic immunotherapy, HR: 0.825 per added method for complex treatment, HR: 0.605 for surgery), previous treatment (HR: 0.778 for ICI, HR: 1.207 for single-agent chemotherapy, HR 1.176 for targeted or local treatment, HR: 1.315 for combination chemotherapy, HR: 2.039 for immunosuppressive factors reduction methods), male sex (HR: 1.204) and AB therapy (HR: 0.475). Significant factors in the TTP model were LDH (HR: 1.348 for high LDH), sub-stage (HR: 1.434 for B-D sub-stage), current therapy type (HR: 0.432 for (ICI), HR: 0.541 for TT, HR: 0.692 per added method for complex therapy HR: 0.705 for surgery), previous therapy (HR: 0.789 for ICI), male sex (HR: 1.167) and AB therapy (HR: 0.478). Conclusions: The addition of AB to standard therapy in melanoma appears to be an independent favorable prognostic factor. Prospective, randomized, clinical trials are needed to investigate these findings further.