• Inger Johanne Zwicky Eide, Åslaug Helland, Simon Ekman, Anders Mellemgaard, Karin Holmskov Hansen, Saulius Cicenas, Jussi Koivunen, Bjørn Henning Grønberg, and Odd Terje Brustugun.
• Vestre Viken Hospital Trust, Drammen, Norway; Department of Cancer Genetics, Institute for Cancer Research, Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway. Electronic address: ingei@vestreviken.no.
• Lung Cancer. 2020 May 1; 143: 27-35.

ObjectivesIn non-small cell lung cancer patients with acquired resistance to first- or second-generation EGFR-TKIs, osimertinib is approved in the presence of the T790 M resistance mutation. We assessed the efficacy of osimertinib in both T790M-positive and T790M-negative patients.Materials And MethodsThe TREM-study is an investigator-initiated, multi-centre, single-arm, phase 2 clinical trial conducted in five Northern European countries. Patients with progression on at least one previous EGFR-TKI were assigned to treatment with 80 mg of osimertinib daily until radiological progression or death. Patients were included regardless of the presence of T790 M. The primary endpoint was objective response rate (ORR).ResultsOf 199 included patients, 120 (60 %) were T790M-positive, 52 (26 %) were T790M-negative and 27 (14 %) had unknown T790M-status. 24 % had brain metastases and 15 % had an ECOG performance status of 2. Overall ORR was 48 % (95 % CI, 41 %-55 %), 60 % (51 %-69 %) for T790M-positive patients and 28 % (15 %-41 %) for T790M-negative patients, p < 0.001. ORR for patients with co-occurring del19 vs L858R was 61 % vs 32 %, p = 0.001. Duration of response was similar between the T790M-positive and -negative groups (11.8 vs 10.7 months, p = 0.229). Overall median progression-free survival (PFS) was 8.9 months (95 % CI, 7.4-10.5), and 10.8 vs 5.1 months for T790M-positive vs -negative patients (HR 0.62, p = 0.007). Median overall survival (OS) was 17.9 months (95 % CI, 14.4-21.3). For T790M-positive vs -negative median OS was 22.5 vs 13.4 months, (HR 0.55, p = 0.002).ConclusionsThis study confirms the efficacy of osimertinib for T790M-positive patients. There was also clinically significant activity of osimertinib in a proportion of T790M-negative patients.Clinical Trial RegistrationThis trial is registered with ClinicalTrials.gov (NCT02504346).Copyright © 2020 Elsevier B.V. All rights reserved.

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