Real-world overall survival of first-line afatinib in EGFR-mutant advanced non–small cell lung cancer at Vietnam National Cancer Hospital

Vu Ha Thanh, Nguyen Thi Thai Hoa, Ta Van To, Truong Cong Minh, Nguyen Tuan Anh

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Abstract

Afatinib is a second-generation tyrosine kinase inhibitor approved for the treatment of advanced non–small cell lung cancer (NSCLC). This retrospective study included 230 patients with stage IIIC/IV, EGFR-mutant lung adenocarcinoma treated with first-line Afatinib at K Hospital between January 2018 and October 2024; follow-up was conducted until September 2025 to evaluate overall survival (OS) and safety. With a median follow-up of 28.2 months, the median overall survival (mOS) was 27.8 months. No significant difference in OS was observed according to brain metastasis status (p = 0.479), whereas liver metastases were associated with a significantly poorer OS (20.9 vs. 28.8 months; p = 0.025). Patients with common EGFR mutations (L858R, Del19) had longer OS compared to those with uncommon mutations (p < 0.05). No significant difference in OS was observed across different dosing levels. Second-line treatment with Osimertinib resulted in the longest mOS (29.0 months). The most common adverse events were diarrhea and skin toxicity (61.3%), mostly mild to moderate, with no grade ≥ 3 toxicities observed.

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