Estimated Cost of Adverse Event Management in Treatment Naïve Non-small Cell Lung Cancer Patients with Common EGFR Mutations Treated with Amivantamab Plus Lazertinib and Osimertinib Plus Chemotherapy.

Background: Recent clinical trials have demonstrated improved efficacy of combination regimens, including amivantamab plus lazertinib and osimertinib plus platinum-based chemotherapy, compared with standard therapy in patients with epidermal growth factor receptor (EGFR)-mutated non-small cell lung cancer (NSCLC). As these regimens enter routine clinical use, understanding the economic implications of treatment-related adverse event (AE) management, including proactive therapy management (PTM), is important. Objectives: To estimate and compare grade 3 or 4 AE management costs associated with first-line amivantamab (intravenous [IV] or subcutaneous [SC]) plus lazertinib and osimertinib plus platinum-based chemotherapy in patients with EGFR-mutated locally advanced or metastatic NSCLC from a US Commercial and Medicare Advantage payer perspective. Methods: A descriptive cost modeling analysis used grade 3/4 AE incidence data from pivotal clinical trials of amivantamab (IV and SC) plus lazertinib and osimertinib plus platinum-based chemotherapy. AEs occurring in ≥5% of patients or deemed clinically significant were included. PTM strategies for dermatologic events, venous thromboembolism, and infusion-related reactions were modeled for amivantamab-based regimens using guideline-concordant practices and clinical trial evidence. As a conservative assumption, PTM for osimertinib plus platinum-based chemotherapy was not included. AE management costs were derived from national inpatient and physician fee schedules and inflated to 2025 US dollars. Total per-patient AE management and PTM costs were estimated for each treatment regimen. Scenario analyses evaluated expanded PTM assumptions. Results: Across both payer perspectives, total AE management costs were estimated to be lower for amivantamab-based regimens than for osimertinib plus platinum-based chemotherapy. Under the Commercial perspective, modeled AE management costs were Conclusions: Results from this descriptive cross-trial analysis indicated that total AE management costs were consistently estimated to be lower in patients receiving amivantamab (SC or IV) plus lazertinib compared with osimertinib plus platinum-based chemotherapy across both a Commercial and Medicare Advantage payer perspective.