A Phase 1b/2 Open-Label Study of Disitamab Vedotin in Combination With Other Anticancer Therapies in Solid Tumors

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Investigational drug late phase More information Active drug More information High burden on patient More information

Trial Details

Sponsor: Seagen, a wholly owned subsidiary of Pfizer (industry)

Phase: 2

Start date: May 20, 2024

Planned enrollment: 172

Trial ID: NCT06157892
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More trial details at ClinicalTrials.gov More info

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chevron Show for: disitamab vedotin (RC48, Aidixi)

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Goal: Evaluate the safety, tolerability, dose, and preliminary antitumor activity of disitamab vedotin in combination with tucatinib in HER2-expressing solid tumors, specifically locally advanced or metastatic breast cancer and gastric/gastroesophageal junction adenocarcinoma, and determine an optimal dose for further study before expanding into defined HER2-low and HER2-positive cohorts.

Patients: Adults with measurable, locally advanced unresectable or metastatic breast cancer or gastric/GEJ adenocarcinoma with HER2 expression, ECOG 0–1, and prior progression on or intolerance to standard therapies. Expansion cohorts enroll HER2-low (IHC 1+ or 2+/ISH−) and HER2-positive (IHC 3+ or 2+/ISH+) subtypes in both breast and gastric/GEJ cancers. Key exclusions include prior tucatinib, prior ADCs with an MMAE payload, active CNS or leptomeningeal disease, recent anticancer therapy within 4 weeks, and conditions precluding oral absorption.

Design: Phase 1b/2, open-label, multicenter study with sequential parts: dose escalation of disitamab vedotin plus tucatinib, followed by a randomized dose-optimization phase assessing two DV dose levels for safety and efficacy in HER2-expressing breast and gastric/GEJ cancers, then expansion into four cohorts (HER2-low and HER2-positive for both tumor types). Planned enrollment is 172 participants.

Treatments: Disitamab vedotin plus tucatinib in all phases and cohorts. Disitamab vedotin (RC48) is an anti-HER2 antibody-drug conjugate comprising a humanized anti-HER2 antibody linked via a cleavable vedotin linker to the microtubule inhibitor MMAE. Mechanisms include targeted delivery to HER2-expressing cells, bystander killing, immunogenic cell death, and HER2 signaling inhibition. Clinical data to date show activity across HER2-overexpressing and HER2-low tumors, including objective responses in metastatic breast cancer and approved use in China for HER2-overexpressing gastric cancer after at least two prior lines; common toxicities include peripheral neuropathy, cytopenias, transaminitis, and fatigue. Tucatinib is an orally administered, selective HER2 tyrosine kinase inhibitor approved in combination regimens for HER2-positive breast cancer, including in patients with brain metastases.

Outcomes: Primary: safety and tolerability measures including laboratory abnormalities, adverse events, dose-limiting toxicities in escalation, and frequency of dose modifications; objective response rate by investigator per RECIST v1.1 in later phases. Secondary: duration of response, disease control rate, progression-free survival, overall survival, pharmacokinetics (Cmax, AUClast), and incidence of anti-drug antibodies to disitamab vedotin.

Burden on patient: Moderate to high. As a Phase 1b/2 combination study with dose escalation and pharmacokinetics, participants can expect intensive early-cycle visits with frequent labs, AE monitoring, and serial PK blood draws. Imaging per RECIST at regular intervals will require travel for scans. Disitamab vedotin is administered intravenously, adding infusion time and potential premedications, while tucatinib is oral and requires adherence and monitoring for hepatic toxicity and diarrhea. Some cohorts require provision of archival or new tumor tissue, which may necessitate a biopsy if archival tissue is insufficient. The open-label design and multi-year follow-up for survival and safety extend visit frequency and monitoring beyond standard care in later lines of therapy.

Last updated: Oct 2025

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