Pretreatment serum ferritin and overall survival in metastatic pancreatic cancer.
171 Background: Ferritin, an iron storage protein, is elevated in the serum of certain types of cancers, including breast and pancreatic. Ferritin has been shown to play a role in tumorigenesis and cancer cell growth and survival through angiogenesis, immune regulation, and iron delivery. Ferritin may serve as a potential biomarker in evaluating survival of pancreatic cancer patients. Methods: This study determined pretreatment ferritin levels in a phase III clinical trial of 162 patients with advanced pancreatic cancer. A quantitative sandwich ELISA (Human Ferritin ELISA (Assaypro, St. Charles, Missouri) was used to measure pretreatment serum ferritin levels in 162 patients with advanced pancreatic cancer. Serum ferritin level was correlated with overall patient survival using log-rank regression and Kaplan-Meier analysis on a continuous and categorical dichotomous basis (median cutpoint). Results: The median pretreatment serum ferritin in 162 patients was 832.6 ng/ml, a 25th and 75th percentile of 446 and 1735 ng/ml, respectively, and ranged from 51 ng/ml to 35914 ng/ml. When analyzed on a continuous basis, patients with higher serum ferritin had reduced overall survival (p= 0.001). When analyzed on a categorical basis (median 832.6 ng/ml), patients with higher ferritin had shorter overall survival (median 121 days vs. 180 days) (p=0.003). In multivariate analysis with pretreatment serum ferritin, TIMP-1, uPA, and VEGF, TIMP-1 remained the only significant predictive factor (p<0.0001), with ferritin trending toward significance (p= 0.076). Conclusions: Pretreatment serum ferritin in 162 patients with advanced pancreatic cancer was quantified using ELISA. Pretreatment serum ferritin predicted for significantly shorter overall survival in a phase III trial of metastatic pancreatic cancer. Pretreatment serum ferritin level has prognostic biomarker utility in pancreatic cancer, and should be evaluated as a predictive factor for response to novel treatment regimens.