Summary
This is a multicenter, open-label, single-arm study of prophylaxis for Dato-DXd-related stomatitis in eligible patients with metastatic or inoperable locally recurrent breast cancer or locally advanced or metastatic Epidermal Growth Factor Receptor-Mutated (EGFRm) non-small cell lung cancer.
Objectives
The purpose of this Phase IV study is to describe the incidence and severity of Dato-DXd treatment-emergent grade ≥ 2 stomatitis in participants receiving prophylactic dexamethasone mouthwash within the first 12 weeks of study treatment (ie, Dato-DXd dosing).
The study will enroll an estimated 100 participants across approximately 35 sites in the U.S. Enrollment of participants is planned to occur over approximately 18 months, with a minimum of 12 weeks of follow-up for each participant after the first Dato-DXd dose.
This study has one arm, and the study population will consist of 2 independent cohorts (approximately 50 participants in each cohort):
- Breast cohort (Cohort 1)
- Lung cohort (Cohort 2)
Participants will receive the study intervention, dexamethasone mouthwash, throughout the duration of their standard of care treatment with Dato-DXd.