Sunvozertinib Monotherapy in Advanced Lung Adenocarcinoma with EGFR Exon 20 Insertion and High PD-L1 Expression: A Case Report.

As a key oncogenic driver in non-small-cell lung cancer (NSCLC), epidermal growth factor receptor (EGFR) exon 20 insertion mutations account for 2-5% of EGFR-mutated NSCLC cases and display marked heterogeneity. Conventional EGFR tyrosine kinase inhibitors (TKIs) are ineffective against these mutations. Sunvozertinib, an orally administered, potent, and highly selective EGFR-TKI, has been approved in China for second-line treatment of NSCLC harboring EGFR exon 20 insertion mutations. Historically, patients with EGFR exon 20 insertion and high programmed death-ligand 1 (PD-L1) expression often received combined immunotherapy and chemotherapy. In the present case report, we describe a patient who exhibited intolerance to first-line immunochemotherapy and was subsequently switched to sunvozertinib for maintenance therapy. This regimen yielded a prolonged progression-free survival, with manageable safety and tolerability profiles. These findings demonstrated that sunvozertinib could be a promising first-line treatment option for NSCLC patients with EGFR exon 20 insertion.