Introduction
Dupilumab is approved for treatment of eosinophilic esophagitis (EoE), but its efficacy is unknown in patients with severe esophageal strictures or a need for frequent dilation, as they were excluded from the phase 3 LIBERTY EoE TREET trial.
Aims & Methods
We aimed to determine the proportion of treatment-refractory, severely fibrostenotic, dilation-dependent EoE patients who have histologic response and improvement in other EoE outcomes after dupilumab treatment. DESTRICT (NCT06352073) is a prospective, single-center, open-label cohort study of dupilumab 300 mg once weekly for up to 52 weeks. Patients aged ≥16 years, weighing ≥40 kg, and with histologically active EoE (peak eosinophil count [PEC] ≥15 eosinophils per high‑power field [eos/hpf]) were included if they had non-response or intolerance to proton‑pump inhibitors and topical corticosteroids (tCS) and a history of narrow-caliber EoE (stricture <10 mm or inability to pass an adult endoscope) or ≥4 prior esophageal dilations (≥2 of which were in the last year). Key exclusion criteria were systemic corticosteroids or tCS within 4 weeks prior to baseline endoscopy, use of biologics within 5 months, and non-EoE eosinophilic gastrointestinal diseases. Patients underwent endoscopy at baseline and 12, 24, and 52 weeks after starting dupilumab. The primary outcome was histologic response (defined as PEC <15 eos/hpf) at 24 weeks. Additional outcomes included minimum esophageal diameter, Endoscopic Reference Score (EREFS; range 0–9), EoE Histologic Scoring System (EoEHSS; range 0–1), Index of Severity for EoE (I-SEE; range 0–78), EoE Symptom Activity Index Patient-Reported Outcome (EEsAI PRO; range 0–100), and safety.
Results
Here, we report interim results for the first 10 patients completing 52 weeks of dupilumab treatment (median age 30 [26–40] years; 90% male; median 11 [8–14] years of EoE prior to study entry). At baseline, all patients had severe disease (median [interquartile range] I‑SEE: 25 [23−25]) and were histologically and endoscopically active (PEC: 143 [74−163] eos/hpf; EREFS: 7 [7−8] with 6 [4−15] prior dilations). At Week 24, 80% had histologic response, with associated decreases in eosinophil counts, EREFS, EoEHSS, and I-SEE. At Week 52, 70% had ongoing histologic response (the other three patients had 15, 18, and 26 eos/hpf), with eosinophil counts decreasing to 6 (2−15) eos/hpf compared with baseline (P = 0.005; 96% decrease). EREFS decreased to 2 (1−3) (P = 0.004; 71% decrease), with decreases in both inflammatory (4 [4−5] to 0 [0−1]; P = 0.004) and fibrostenotic (3 [3−4] to 2 [1−2]; P = 0.005) subscores. Decreases were also seen at Week 52 in EoEHSS grade and stage scores (0.60 to 0.16 and 0.62 to 0.14, respectively; P = 0.005 for both), I-SEE score (25 [23−25] to 3.5 [1−4; P = 0.005] with 10% inactive/80% mild), and EEsAI PRO (27 [27−34] to 0 [0−12]; P = 0.006). Minimum esophageal diameter increased from 12 (10−13) mm to 17 (16−18) mm (P = 0.005; 42% increase), and 40% did not require esophageal dilation at Week 52. These outcomes were maintained or improved from Week 24. Dupilumab was generally well tolerated, with no medication-related serious adverse events. The most common adverse events were injection‑site reactions.
Conclusion
After 52 weeks of treatment with dupilumab, this treatment-refractory and severely fibrostenotic EoE population had histologic responses and improvements in other outcomes comparable to or better than those seen in less severe EoE patients. The study is ongoing to assess outcomes for the planned full study cohort (n = 20).
Disclosure
Dellon ES: AbbVie, Adare/Ellodi, Alfasigma, ALK, Allakos, Amgen, AnaptysBio, Apogee, Apollo, Aqilion, Arena/Pfizer, AstraZeneca, Bethanamist, Biocryst, Bryn, Calypso, Celgene/Receptos/Bristol Myers Squibb, Celldex, Cyted, Domain, Dr. Falk Pharma, EsoCap, Eupraxia, Ferring, GI Reviewers, GSK, Holoclara, Invea, Knightpoint, LucidDx, Nexstone Immunology/Uniquity, Nutricia, Parexel/Calyx, Phathom, Regeneron Pharmaceuticals Inc., Revolo, Robarts/Alimentiv, Roivant, Sanofi, Shire/Takeda, Target RWE, Third Harmonic Bio, Upstream Bio – consulting fees; Adare/Ellodi, Allakos, Arena/Pfizer, AstraZeneca, Celldex, Celgene/Receptos/Bristol Myers Squibb, Dr. Falk Pharma, Eupraxia, Ferring, GSK, Meritage, Miraca, Nutricia, Phathom, Regeneron Pharmaceuticals Inc., Revolo, Sanofi, Shire/Takeda, Uniquity – research funding; Allakos, Aqilion, Holoclara, Invea – educational grants.
Brownlee A, Cortright LM, Walker KB, Clark G, Soucaze LH, Phillips JR, Sanderford AE: No conflicts of interest.
Reed CC: GI Reviewers, AstraZeneca – consulting fees.
Zaghloul S, Almansa C: Sanofi – employees, may hold stock and/or stock options in the company.
Radwan A, deMarchi S, Durrani S: Regeneron Pharmaceuticals Inc. – employees and shareholders.
Moist SE: Apogee Therapeutics – advisory board.