689P - Phase II trial of preoperative modified FOLFIRINOX (mFOLFIRINOX) followed by postoperative gemcitabine (GEM) in patients (pts) with borderline resectable (BR) and locally advanced (LA) pancreatic ductal adenocarcinoma (PDAC)

Abstract

BackgroundmFOLFIRINOX and GEM are standard chemotherapy for pts with PDAC. This single-arm phase 2 trial assessed the efficacy and safety of perioperative chemotherapy consisted of preoperative mFOLFIRINOX and postoperative GEM in pts with BR/LA-PDAC. MethodsPts with histologically proven and radiologically confirmed BR/LA-PDAC as defined by NCCN criteria were eligible. Pts received 8 cycles of preoperative mFOLFIRINOX (oxaliplatin 85mg/m2, irinotecan 180mg/m2, 5-FU 2,400mg/m2 over 46hours, and leucovorin 400mg/m2), every 2 weeks. For pts who underwent surgery, postoperative GEM (1,000mg/m2 D1, 8, 15, every 4 weeks) was given for 6 cycles. Primary endpoint was 1-year progression-free survival (PFS) rate and secondary endpoints were PFS, overall survival (OS) and curative surgery rate. A total of 44 pts were required to show the improvement in 1-year PFS rates from 30% to 50% with a two-sided alpha of 0.05, beta of 0.8 and drop-out rates of 10%. ResultsBetween May/2016 and Mar/2018, 44 patients were enrolled. Median age was 60 years (range, 35-76) and 26 pts (59%) were male. Pancreas head was most common site (n=26, 59%), and 29 (66%) and 15 (34%) pts had BR- and LA-PDAC, respectively. With mFOLFIRINOX, response rate was 34% and surgery was done in 27 pts (61%); 22 and 5 pts achieved R0 and R1 resection, respectively, and postoperative GEM was given in 26 patients (96%). With median follow-up of 20.7 months (95% CI, 14.4-27.0), 1-year PFS rate was 52.0% (95% CI, 37.1-66.9), and 2-year OS rate was 49.8% (95% CI, 38.2-71.4). Median PFS and OS was 12.2 months (95% CI, 7.9-15.9), and 22.3 months (95% CI, 11.3-33.3), respectively. Median OS was significantly prolonged in pts who underwent surgery compared to those who did not (26.2 months [95% CI, 23.1-29.3] vs 9.0 months [95% CI, 6.6-11.4 months]; p<0.001). For pts with surgery, R1 resection was significantly associated with poor postoperative OS compared to R0 resection (p=0.04). ConclusionsPerioperative chemotherapy using mFOLFIRINOX and GEM was feasible and effective for pts with BR/LA-PDAC. Clinical trial identificationNCT02749136. Legal entity responsible for the studyThe authors. FundingBoryung Pharmaceuticals. DisclosureAll authors have declared no conflicts of interest.