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Background: Recent studies support the use of gemcitabine and nab-paclitaxel in adults with locally advanced unresectable or metastatic pancreatic adenocarcinoma although insufficient data are available on prognostic and predictive markers of response to treatment.Objective: The objective of this study is to identify treatment response markers in patients with locally advanced unresectable or metastatic pancreatic adenocarcinoma.Materials and Methods: This is an observational, retrospective, and multicenter study. Sociodemographic, clinical, and therapeutic data were collected. Cox regression models were applied to determine associations.Results: In total, 39 patients were included; 23.1% presented locally advanced pancreatic cancer and 76.9% metastatic disease. They received a mean of 6 ± 3 treatment cycles; 59% required dose reduction, 59% treatment delay, and 20.5% switched to a biweekly regimen. The overall response rate was 23% and the disease control rate was 81%. Median progression-free survival was 9 months and median overall survival (OS) was 15 months. A higher neutrophil/lymphocyte ratio (NLR) was significantly associated with lower OS. We reported Grades 1-4 nonhematological and hematological toxicities.Conclusion: NLR is a useful prognostic factor for OS in patients with locally advanced unresectable or metastatic pancreatic adenocarcinoma treated with gemcitabine and nab-paclitaxel. Moreover, we suggest that a biweekly regimen is an option for certain groups of patients. [ABSTRACT FROM AUTHOR]