FOLFIRINOX in locally advanced and metastatic pancreatic cancer.
e14615 Background: The phase III trial of 5-FU, leucovorin, irinotecan, and oxaliplatin (FOLFIRINOX) demonstrated improved survival compared to gemcitabine in good performance status (PS) patients (pts) with metastatic pancreatic cancer (Conroy et al, NEJM 2011). Less is known about the efficacy and tolerability of FOLFIRINOX in the non-clinical trial setting. In this retrospective analysis, we report our institutional experience with FOLFIRINOX. Methods: 38 pts with locally advanced (LAPC) or metastatic pancreatic cancer (MPC) who began treatment with FOLFIRINOX between 7/2010 and 6/2011 were identified. Clinical characteristics, gradable toxicities, and molecular genotyping results were tabulated. Formal radiographic review was performed to determine best overall response rates (ORR). All pts receiving FOLFIRINOX were assessed for toxicities, while pts receiving ≥2 cycles were assessed for response. Results: 26 pts received FOLFIRINOX for MPC and 12 pts for LAPC. The median age was 60 (range 39-76). 29/38 pts were men, 26/38 had received no prior chemotherapy, and 11/38 had biliary stents. Overall, 12 partial responses (PR) were observed in 33 evaluable pts (ORR 36%); 11/12 partial responses were in chemo-naïve pts. In evaluable pts with MPC, there were 7 PR (ORR 33%), and 11 pts with stable disease (SD). In LAPC, there were 5 PR (ORR 42%), and 7 pts with SD. Following FOLFIRINOX, two pts with LAPC have subsequently undergone R0 resection. 18/38 pts required an ED visit or hospitalization during treatment. Grade 3/4 neutropenia was observed in 12 pts; 8/12 had not received prophylactic growth factor from the start of FOLFIRINOX. There were 6 pts with febrile neutropenia, 6 pts with grade 3/4 thrombocytopenia, and 5 pts with grade 3/4 anemia. 1 pt died with bacteremia in the setting of febrile neutropenia. 22 pts had molecular genotyping at multiple loci performed: 17/22 were KRAS mutation positive, and 3 pts with KRAS mutations also had TP53 mutations. 4 pts were wild-type at all loci tested, and 3 of these pts had a PR on FOLFIRINOX. Conclusions: In a non-clinical trial setting, FOLFIRINOX demonstrated activity in both LAPC and MPC, but is associated with significant toxicities, with nearly half of pts requiring an ED visit or hospitalization.