RecruitingPhase 1Drug trial5G-EMERALD: Amivantamab in Malignant Brain TumoursThe purpose of this clinical trial is to evaluate the safety and tolerability of amivantamab and to determine the preliminary antitumour activity of amivantamab administered at the recommended Phase 2 dose (RP2D). In the Phase 1b of this study a biomarker defined arm will be opened, initially in the relapsed GMB setting, enrolling 12 patients. These patients will be treated with amivantamab monotherapy. Amivantamab will be administered intravenously (IV) weekly for the first 4 weeks, then every 2 weeks thereafter until disease progression or unacceptable toxicity. The first dose will be given as a split infusion, 350 mg IV over 4 hours on cycle 1 day 1 and 1400 mg IV over 6 hours on cycle 1 day 2. Subsequent infusions are given at a dose of 1750 mg IV over 2-5 hours in cycle 1 and between 2-3 hours from cycle 2 onwards if the first dose was well-tolerated with no significant toxicity. Progression to Phase 2 is dependent on emergent data and funding.