Prognostic impact of inflammatory and nutritional biomarkers in pancreatic cancer

Pancreatic cancer is usually associated with a poor prognosis. Surgery is the main curative treatment but pancreatic operations are aggressive and new tools that help clinicians to predict surgical and prognostic outcomes are necessary. Lu et al recently published a retrospective, single centre cohort study evaluating the impact of seven nutritional and inflammatory markers in pancreatic cancer surgical patients: The albumin-to-globulin ratio, prognostic nutritional index (PNI), systemic immune-inflammation index (SII), neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), nutritional risk index, and the geriatric nutritional risk index. A significant correlation was found between the PNI, SII, NLR, and PLR and a hospital discharge of less than 15 days. In a univariable analysis, PNI, SII, NLR and PLR were significantly related to recurrence-free survival and, in a multivariable analysis PNI was associated with overall survival. Various meta-analyses corroborate the results in terms of prognosis but individual studies are discordant on their usefulness. Besides, the cut-off values for these markers vary significantly between studies and there are no clinical trials comparing them to identify the most relevant ones. These are limitations when implementing nutritional and inflammatory biomarkers into clinical practice and further studies are needed in order to answer these questions.