Background: Following induction chemotherapy, both resection or irreversible electroporation (IRE) may further improve survival in patients with locally advanced pancreatic cancer (LAPC). However, prospective studies combining these strategies are currently lacking, and available studies only report on subgroups that completed treatment. This study aimed to determine the applicability and outcomes of resection and IRE in patients with nonprogressive LAPC after induction chemotherapy.

Methods: This was a prospective, single-center cohort study in consecutive patients with LAPC (September 2013 to March 2015). All patients were offered 3 months of induction chemotherapy (FOLFIRINOX or gemcitabine depending on performance status), followed by exploratory laparotomy for resection or IRE in patients with Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 nonprogressive, IRE-eligible tumors.

Results: Of 132 patients with LAPC, 70% (n = 93) started with chemotherapy (46% [n = 61] FOLFIRINOX). After 3 months, 59 patients (64%) had nonprogressive disease, of whom 36 (27% of the entire cohort) underwent explorative laparotomy, resulting in 14 resections (11% of the entire cohort, 39% of the explored patients) and 15 IREs (11% of the entire cohort, 42% of the explored patients). After laparotomy, 44% (n = 16) of patients had Clavien-Dindo grade 3 or higher complications, and 90-day all-cause mortality was 11% (n = 4). With a median follow-up of 24 months, median overall survival after resection, IRE, and for all patients with nonprogressive disease without resection/IRE (n = 30) was 34, 16, and 15 months, respectively. The resection rate in 61 patients receiving FOLFIRINOX treatment was 20%.

Conclusion: Induction chemotherapy followed by IRE or resection in nonprogressive LAPC led to resection or IRE in 22% of all-comers, with promising survival rates after resection but no apparent benefit of IRE, despite considerable morbidity. Registered at Netherlands Trial Register (NTR4230).

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http://dx.doi.org/10.1245/s10434-017-5900-9DOI Listing

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