• Dong-Wan Kim, Dae Ho Lee, Ji-Youn Han, Jongseok Lee, Byoung Chul Cho, Jin Hyoung Kang, Ki Hyeong Lee, Eun Kyung Cho, Jin-Soo Kim, Young Joo Min, Jae Yong Cho, Ho Jung An, Hoon-Gu Kim, Kyung Hee Lee, Bong-Seog Kim, In-Jin Jang, Seonghae Yoon, OakPil Han, Young Su Noh, Ka Young Hong, and Keunchil Park.
• Seoul National University Hospital, Seoul, South Korea. Electronic address: kimdw@snu.ac.kr.
• Lung Cancer. 2019 Sep 1; 135: 66-72.

ObjectivesThe aim of this phase 1/2 study was to evaluate the safety, tolerability, pharmacokinetics and antitumor activity of olmutinib in patients with epidermal growth factor receptor (EGFR)-mutated non-small cell lung cancer (NSCLC) who had failed ≥ 1 previous line of EGFR-tyrosine kinase inhibitor (TKI) therapy.Materials And MethodsPhase 1 consisted of dose-escalation and four dose-expansion parts (1: olmutinib 300 mg once daily; 2A: 800 mg once daily [EGFR T790 M mutation-positive patients]; 2B: 500 mg twice daily [EGFR T790 M mutation-positive]; 3: 800 mg once daily [EGFR T790 M mutation-negative]). In phase 2, EGFR T790 M mutation-positive patients received olmutinib 800 mg once daily. Data from expansion part 2A and phase 2 were integrated (`pooled phase 2'). Each olmutinib cycle was 21 days. Outcomes included: tumor response, treatment-emergent adverse events (TEAEs), pharmacokinetic parameters.ResultsOverall, 272 patients received at least one olmutinib dose: dose-escalation (n = 66), expansion parts (n = 165), phase 2 (n = 41). In pooled phase 2, the overall objective response rate, confirmed by independent review, was 55.1% (38/69 evaluable patients; 95% CI, 42.6-67.1). All responses were partial responses; 23 patients had stable disease. Estimated median progression-free survival was 6.9 (95% CI, 5.6-9.7) months; estimated median overall survival was not reached. The most frequent treatment-related AEs were diarrhea (59.2% of patients), pruritus (42.1%), rash (40.8%), and nausea (39.5%).ConclusionOlmutinib showed effective clinical activity with a manageable safety profile, indicating therapeutic potential for T790M-positive NSCLC patients who have failed ≥ 1 previous line of EGFR-TKI therapy.Copyright © 2019 Elsevier B.V. All rights reserved.

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