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Yoon Hee Choi

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    OA10 - Right Patient, Right Target & Right Drug - Novel Treatments and Research Partnerships (ID 910)

    • Event: WCLC 2018
    • Type: Oral Abstract Session
    • Track: Targeted Therapy
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/25/2018, 10:30 - 12:00, Room 106
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      OA10.05 - An Open-Label, Multicenter, Phase II Single Arm Trial of Osimertinib in NSCLC Patients with Uncommon EGFR Mutation(KCSG-LU15-09) (ID 14365)

      11:15 - 11:25  |  Author(s): Yoon Hee Choi

      • Abstract
      • Presentation
      • Slides


      Approximately 10% of EGFR mutants harbor uncommon mutations, which represent a heterogeneous group of rare molecular alterations within exons 18-21 and the sensitivity to EGFR TKIs is variable. Osimertinib is a potent irreversible inhibitor of both sensitizing EGFR mutation and T790M. In preclinical data, osimertinib was found to be active against most uncommon EGFR mutants, apart from the exon 20 insertion variant. Here we present the efficacy and safety of osimertinib in patients with uncommon EGFR mutation positive NSCLC.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Patients with histologically confirmed metastatic or recurrent NSCLC with activating EGFR mutation other than exon 19 deletion, L858R, T790M and insertion in exon 20 were eligible. Patients received 80mg of osimertinib orally, once daily until progression or unacceptable toxicity. Response was assessed every 8 weeks by investigator. The trial was registered with, number NCT03424759.

      4c3880bb027f159e801041b1021e88e8 Result

      Between Mar 2016 and Oct 2017, 35 patients were enrolled. Median age was 59, 63% male, 43% never smoker, 97% adenocarcinoma. 63% of patients were treated as first-line therapy. The mutations identified were G719A/C/D/S/X (19, 54.3%) followed by L861Q (9, 25.7%), S7681 (8, 22.9%), and others (3, 8.6%). The overall response rate was 50.0% (95% CI 32.8-67.2) and DCR was 88.9% (95% CI 78.1-99.7). Seven patients (77.8%) with L861Q mutation achieved partial response; 10/19 (52.6%) with G719A/C/D/S/X mutation; 3/8 (37.5%) with S768I mutation. At data cutoff (Apr, 2018), the median PFS was 8.2 months (95% CI 1.9- 14.4) and median duration of response was 9.8 months (95% CI 7.6-12.0). The most common adverse events were rash (n=11, 31.4%), anorexia (n=8, 22.9%), and diarrhea (n=7, 20.0%). Grade 3 or 4 AEs were reported in 8 of 35 patients (23%), but all of AEs were manageable.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Osimertinib showed highly active in NSCLC patients harboring uncommon EGFR mutation with manageable safety profile, consistent with previous reports. Further analysis will be provided.


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