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MA26 - New Therapies and Emerging Data in ALK, EGFR and ROS1 (ID 930)
- Event: WCLC 2018
- Type: Mini Oral Abstract Session
- Track: Targeted Therapy
- Presentations: 1
- Coordinates: 9/26/2018, 13:30 - 15:00, Room 201 BD
MA26.09 - Lazertinib, a Third Generation EGFR-TKI, in Patients with EGFR-TKI-Resistant NSCLC: Updated Results of a Phase I/II Study (ID 12817)
14:30 - 14:35 | Author(s): Sohee Kim
Lazertinib (YH25448) is a highly mutant-selective, irreversible 3rd-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) that can penetrate the blood-brain barrier, and targets the activating EGFR mutations Del19 and L858R, as well as the T790M mutation, while sparing wild type. We report the updated results from a Phase I/II study of lazertinib (NCT03046992)a9ded1e5ce5d75814730bb4caaf49419 Method
Patients with advanced and metastatic NSCLC who had progressed after treatment with EGFR-TKIs with/without asymptomatic brain metastases (BM) were enrolled in an open-label, multicenter, phase I/II study with dose-escalation and expansion cohorts. Lazertinib was administered once daily at doses between 20 to 320 mg in a 21-day cycle. Patients were assessed for safety, tolerability, pharmacokinetics and efficacy. T790M status was confirmed in the dose-expansion cohorts.4c3880bb027f159e801041b1021e88e8 Result
A total of 115 patients (median age 62 years, female 62%) were enrolled. The dose-escalation cohort included 38 patients administered with 20 to 320 mg across 7 dose levels, and 77 patients in the dose-expansion cohort were administered with 40 to 240 mg across 5 dose levels. No dose-limiting toxicities were observed in the dose-escalation cohort. Systemic exposure increased dose-dependently. Of the evaluable patients (n=110) at data cut-off, the objective response rate (ORR) was 65% (95% confidence interval [CI], 54.9 to 73.4). The ORR for 93 of the T790M+ patients was 69% (95% CI, 58.4 to 78.0). In patients with BM (n=12), the intracranial ORR was 50% (95% CI, 21.1 to 78.9). The most common treatment-emergent adverse events (TEAEs) were pruritus (19%), decreased appetite (17%), rash (14%), and constipation (12%). The most frequently reported TEAEs of grade ≥ 3 were hyponatraemia (2%), nausea (2%) and pneumonia (2%).
ORR in T790M+ patients Dose QD 20 mg 40 mg 80 mg 120 mg 160 mg 240 mg Evaluable patients*, n 2 25 18 22 18 8 ORR, n (%) 2 (100) 17 (68) 11 (61) 17 (77) 11 (61) 6 (75) * Patients were deemed evaluable for response if they underwent a post-baseline radiological assessment (RECIST 1.1) or were discontinued prior to the post-baseline assessment.
Lazertinib was safe, well-tolerated and exhibited promising systemic and intracranial antitumor activity in EGFR T790M+ NSCLC patients. The dose-expansion cohort as the first and second-line setting has been initiated from April 2018.6f8b794f3246b0c1e1780bb4d4d5dc53
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