Effect of chemotherapy on survival of patients with recurrent pancreatic ductal adenocarcinoma (PDAC) following surgical therapy.

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e15748 Background: Patients with recurrent PDAC are treated similarly to patients with de novo metastatic disease. The aim of this study is to report the outcome of patients with recurrent PDAC following initial definitive resection and adjuvant therapy. Methods: Patients were identified from an IRB approved, retrospective database at Indiana University that contained patient and tumor characteristics, adjuvant therapy and all treatment for metastatic disease. Follow-up was updated as of 6/2014. Overall survival (OS) from recurrence until death or last follow up was estimated using the Kaplan Meier method. Results: Between 2008-2014, 451 patients with resectable PDAC and available follow up data were identified, of whom 234 had documented relapse. Patient/tumor characteristics were as follows: median age: 64.2 years (25-89), 54% male, 76% LN+, 24% positive margins, 66% and 85% with lymphovascular and perineural invasion respectively. 69% of patients received adjuvant gemcitabine (GEM). Median time to relapse was 10 months. 60% of patients received at least 1 line of systemic therapy and 18% received 2 lines. Chemotherapy was GEM-based: 33%, 5FU-based 33%, or both 33% and 1% other treatment. Median OS from time of relapse was significantly improved following chemotherapy compared to no chemotherapy (10 months vs 3 months, P < 0.0001). Median OS for 5FU based and GEM based treatment was 6 and 8 months, respectively (P = 0.09). Those who received both had mOS of 14 months (95% C.I 10-17months, P < 0.0001). On univariate analysis, chemotherapy, regardless of type was associated with a survival benefit. Conclusions: Chemotherapy appears to be associated with survival benefit for patients with relapsed PDAC following initial curative therapy. Survival in our retrospective study appears similar to reported literature for de novo metastatic disease.