Oral oncology · 2026
Intravenous amivantamab after cetuximab failure in recurrent or metastatic head and neck squamous cell carcinoma: a single-centre retrospective real-world cohort study.
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Xue Liqiong, Zhou Jiuli, Tang Wenbo, Zhao Wei, Lin Fengjuan, Guo Ye
Аннотация
BACKGROUND: Patients with recurrent or metastatic head and neck squamous cell carcinoma (R/M HNSCC) who exhaust platinum, immune checkpoint inhibitors (ICIs), and cetuximab lack standard options. The OrigAMI-4 trial showed subcutaneous amivantamab activity in anti-EGFR-naïve patients; real-world intravenous (IV) amivantamab data after cetuximab failure are absent.
METHODS: We retrospectively analysed consecutive R/M HNSCC patients treated with IV amivantamab monotherapy (November 2024-July 2025) after progression on standard therapies. Response was assessed per RECIST 1.1; toxicity per CTCAE v5.0.
RESULTS: Twenty patients were included (median age 54 years; 70.0% male; median four prior systemic lines). All received prior platinum and ICIs; 18 (90.0%) progressed on cetuximab. At a median follow-up of 6.8 months, confirmed ORR was 30.0% (6/20; 95% CI 11.9-54.3) ; DCR at first reassessment (6 weeks) was 80.0% (16/20; 95% CI 56.3-94.3) and confirmed DCR at 12 weeks was 45.0% (9/20; 95% CI 23.1-68.5). Median PFS was 3.0 months (95% CI 2.3 to not reached) and median OS 9.7 months (95% CI 6.8 to not reached). The most frequent treatment-related adverse events were hypoalbuminaemia (90.0%), rash (70.0%), and infusion-related reactions (45.0%; all grade 1-2); two patients had grade 3 events, none discontinued treatment.
CONCLUSION: In this small retrospective cohort, IV amivantamab showed antitumour activity in heavily pretreated, cetuximab-exposed R/M HNSCC, with a 30% confirmed ORR, 45% confirmed 12-week DCR, 9.7-month median OS, and no treatment discontinuations for toxicity. These data suggest that dual EGFR-MET targeting may retain clinical utility after anti-EGFR failure, and support prospective evaluation with biomarker stratification.
METHODS: We retrospectively analysed consecutive R/M HNSCC patients treated with IV amivantamab monotherapy (November 2024-July 2025) after progression on standard therapies. Response was assessed per RECIST 1.1; toxicity per CTCAE v5.0.
RESULTS: Twenty patients were included (median age 54 years; 70.0% male; median four prior systemic lines). All received prior platinum and ICIs; 18 (90.0%) progressed on cetuximab. At a median follow-up of 6.8 months, confirmed ORR was 30.0% (6/20; 95% CI 11.9-54.3) ; DCR at first reassessment (6 weeks) was 80.0% (16/20; 95% CI 56.3-94.3) and confirmed DCR at 12 weeks was 45.0% (9/20; 95% CI 23.1-68.5). Median PFS was 3.0 months (95% CI 2.3 to not reached) and median OS 9.7 months (95% CI 6.8 to not reached). The most frequent treatment-related adverse events were hypoalbuminaemia (90.0%), rash (70.0%), and infusion-related reactions (45.0%; all grade 1-2); two patients had grade 3 events, none discontinued treatment.
CONCLUSION: In this small retrospective cohort, IV amivantamab showed antitumour activity in heavily pretreated, cetuximab-exposed R/M HNSCC, with a 30% confirmed ORR, 45% confirmed 12-week DCR, 9.7-month median OS, and no treatment discontinuations for toxicity. These data suggest that dual EGFR-MET targeting may retain clinical utility after anti-EGFR failure, and support prospective evaluation with biomarker stratification.