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C.B. Mather



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    MINI 05 - EGFR Mutant Lung Cancer 1 (ID 103)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Treatment of Advanced Diseases - NSCLC
    • Presentations: 1
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      MINI05.08 - Comparison of the Efficacy of Dacomitinib v Erlotinib for NSCLC Pts with Del 19/L858R (ID 775)

      17:25 - 17:30  |  Author(s): C.B. Mather

      • Abstract
      • Presentation
      • Slides

      Background:
      To date there have been limited randomized comparisons of EGFR tyrosine kinase inhibitors (TKI) in EGFR mutant NSCLC. Dacomitinib is a potent, irreversible EGFR inhibitor that demonstrated robust activity in a phase 2 study for patients with common activating EGFR mutations. Additionally, preclinical data suggests greater activity in patients with common EGFR activating mutations in exon 19 or 21. ARCHER 1009 (NCT01360554) and A7471028 (NCT00769067) each compared the clinical activity of dacomitinib (D) versus erlotinib (E) in advanced NSCLC including patients with common activating EGFR mutations; pooled results are presented.

      Methods:
      Patients (pts) with locally advanced/metastatic NSCLC were randomized following progression with 1 or 2 prior chemotherapy regimens to treatment with dacomitinib (D) (45 mg PO QD) or erlotinib (E) (150 mg PO QD). The Phase 2 study (A7471028) was open label while the Phase 3 ARCHER 1009 study was double-blind and double dummy. Archived tumor tissue, ECOG performance status (PS) of 0-2, adequate organ function and informed consent were required. Results of the two studies were previously reported individually. Analyses were performed by pooling patients with common EGFR activating mutations from both studies to compare efficacy of D versus E.

      Results:
      121 patients with any EGFR mutation were enrolled into the two studies with 1 patient randomized but not treated; 101 (53 on D) pts had activating mutations in exon 19 or 21. For patients with exon19/21 mutations, the median PFS was 14.6 months (95%CI 9.0–18.2) for D and 9.6 months (95%CI 7.4–12.7) for E and unstratified HR 0.717 (95%CI 0.458–1.124) with 1-sided p=0.073. The median OS was 26.6 months (95%CI 21.6–41.5) for D and 23.2 months (95%CI 16.0–31.8) for E and unstratified HR 0.737 (95%CI 0.431–1.259) with 1-sided p=0.132. The corresponding pooled analyses were conducted separately in exon 19 and exon 21. The adverse-event profile did not differ between the activating mutation subset and the overall population. Figure 1



      Conclusion:
      Dacomitinib may be associated with an improved PFS and OS compared to Erlotinib in patients with exon 19/21 EGFR mutations. A prospective P3 study comparing D to another EGFR TKI in 1L EGFR mutated NSCLC is ongoing to verify these observations (NCT01774721).

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