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flag Zipalertinib showed promise in treating aggressive lung cancer with brain spread, but caused serious side effects in a small trial.

flag Taiho Oncology and Cullinan Therapeutics presented preliminary Phase 2b REZILIENT2 trial data at ESMO Congress 2025, showing zipalertinib, an investigational EGFR inhibitor, had a 31.3% intracranial response rate and 68.8% disease control rate in 16 NSCLC patients with EGFR exon 20 insertion or uncommon mutations and active brain metastases. flag The drug, given at 100 mg twice daily, also showed systemic responses in 27.6% of patients, with a median response duration of 8.1 months for brain lesions and 7.6 months systemically. flag Grade 3 or higher treatment-related adverse events occurred in 25%, including interstitial lung disease, which caused one death. flag The data support zipalertinib’s potential for treating a hard-to-treat NSCLC subgroup with CNS involvement, though it remains investigational and unapproved.

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