Abstract
Aim: This noninterventional study (NCT05769764) aimed to characterize human epidermal growth factor receptor 3 (HER3) expression in non-small cell lung cancer (NSCLC) by patient, clinical or tumor characteristics.Methods: HER3 immunohistochemistry was performed in archival tissue samples from patients with advanced or metastatic NSCLC. Samples were scored for membrane percent positivity and intensity. Membrane H-scores were calculated.Results: Of 203 evaluable samples, HER3 expression was observed in 98.5%, including all histologies, genomic subtypes and regardless of prior systemic anticancer treatments. The median H-score was 140, and 70.4% had a HER3 intensity of 3+.Conclusion: HER3 is widely expressed in NSCLC, indicating that HER3-directed therapy may be broadly applicable across diverse subtypes of NSCLC.
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