A phase II open-label study of enfortumab vedotin in patients with previously treated locally advanced, recurrent, or metastatic pancreatic adenocarcinoma (EPIC).

Abstract

TPS719 Background: Nectin-4 is a type I transmembrane protein member of the nectin family involved in the formation and maintenance of adherens junctions. In contrast to its limited expression in normal tissues, aberrant overexpression of nectin-4 has been identified in various solid tumors, including in pancreatic adenocarcinoma. About 71% of human PDAC specimens stain positive and 13% stain strongly positive for nectin-4. Mechanistically, nectin-4 has been associated with various pro-oncogenic cellular processes, including the promotion of tumor cell proliferation and metastasis via WNT- βcatenin pathway activation. It interacts with ERBB2/HER2 and activates Rac1 (small G protein) to ultimately upregulate PI3K-AKT pathway signaling, leading to cell survival and proliferation. Enfortumab vedotin (EV) is an antibody-drug conjugate that delivers the microtubule-disrupting agent monomethyl auristatin E (MMAE) to cells expressing Nectin-4. EV is FDA approved as a single agent for the treatment of adult patients with locally advanced or metastatic urothelial cancer who have previously received a programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor and platinum-containing chemotherapy based on the EV-301 Trial which demonstrated overall survival benefit. Taken together, the above data and the efficacy of EV seen in bladder cancer warrants the evaluation of EV in advanced pancreatic adenocarcinoma. Methods: Design: Open-label, phase II single-arm trial of EV (n=28) in previously treated locally advanced, recurrent, or metastatic pancreatic adenocarcinoma. Treatment schedule: EV 1.25 mg/kg administered IV on D1, D8, D15 every 28 days until disease progression or unacceptable toxicity. Imaging assessment will be done every 8 weeks. A biopsy prior to therapy and a biopsy on treatment (between days 15-21 of cycle 1) is required. Eligibility: Patients with previously treated, locally advanced, recurrent, or metastatic pancreatic adenocarcinoma. Inclusion criteria also include ECOG PS 0-1 and at least 1 line of prior therapy. Objectives: The primary objective is to determine anti-tumor activity by overall response rate using RECIST 1.1. Secondary objectives include safety, duration of response, disease control rate, progression-free survival and overall survival. Exploratory objectives include Nectin-4 expression (H-score) in tumor tissue and the relationship between the mutational profile of the tumor and response. Statistical Plan: A Simon’s two-stage Minimax design will be used. In the first stage, 18 pts will be accrued. If there is less than 1 response in these 18 pts, the study will be stopped for futility. Otherwise, 10 additional pts will be accrued for a total of 28 pts. The null hypothesis will be rejected if 3 or more responses are observed in 28 pts. Enrollment is currently ongoing. Clinical trial information: NCT05915351 .