Risk factors associated with overall survival (OS) in recurrent pancreatic adenocarcinoma (PAC) following curative resection (CR).

Abstract

437 Background: Patients (pts) with localized pancreas cancer (LPAC) undergo CR with curative intent. Despite improvements in adjuvant treatment (trmt) and surgical techniques, the majority of pts succumb to recurrent disease (dx). The purpose of this study is to identify risk factors associated with OS in pts with recurrent PAC. Methods: Pt clinical and dx data was obtained by a retrospective review of patients with LPAC who underwent CR from 2004-2012 and had recurrent dx. Pts were subdivided into two groups, time to recurrence less/equal or greater than 6 months. Univariate and multivariate Cox regression models were used to determine the association between pt characteristics and OS. Results: 93 pts were identified with recurrent PAC. Select pt characteristics are listed in the Table. In univariate Cox models, only lymph node (LN) status is significantly associated with OS (HR 01.67; p=0.043). OS was 25.6 months (95% CI, 19.4-25.6) for LN positive tumors and 10.6 months (95% CI, 10.6-20.1) for LN negative tumors. In a multivariate Cox model adjusted for pt characteristics, LN status remained significant for OS (HR=1.67; p=0.043). Pts with early recurrent PAC (≤6 month) seem to follow patterns of distant metastatic dx while pts with later recurrence that of locoregional dx. Conclusions: LN involvement is associated with patterns of early recurrence with predominantly metastatic disease and decreased OS in pts with recurrent PAC. LN status may act as a surrogate marker for pattern of recurrence and merit consideration in the selection, stratification and trmt of patients in clinical trials. After CR, LN involvement may influence choice trmt and warrant more aggressive therapy. [Table: see text]