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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
MA26.11 - Effects of Dose Modifications on the Safety and Efficacy of Dacomitinib for EGFR Mutation-Positive NSCLC (ID 13318)
14:40 - 14:45 | Author(s): Geeta Devgan
In patients with EGFR mutation-positive advanced stage NSCLC, first-line dacomitinib significantly improved PFS, OS, DoR and time to treatment failure vs gefitinib (ARCHER 1050; NCT01774721).1,2 Dacomitinib starting dose was 45 mg QD for all patients, with reductions to 30 or 15 mg QD permitted. We explored effects of dacomitinib dose reduction on safety and efficacy in this ongoing study.a9ded1e5ce5d75814730bb4caaf49419 Method
Patients with newly diagnosed stage IIIB/IV or recurrent NSCLC harboring an EGFR mutation (exon 19 del or exon 21 L858R) randomized to dacomitinib received 45 mg PO QD. Study endpoints and protocol-defined dose reduction parameters were previously described.1 We evaluated reasons for dose reductions, and their effects on incidence and severity of common adverse events (AEs) and key efficacy endpoints (PFS, OS, ORR). Data cutoff dates: 17-Feb-2017 (OS), 29-Jul-2016 (other endpoints).4c3880bb027f159e801041b1021e88e8 Result
Overall, 150 (66.1%) patients dose reduced for AEs (87 and 63 reduced to 30 and 15 mg QD as lowest dose, respectively); most commonly for skin toxicities (62.6%) and diarrhea (14.0%). Median time to each successive dose reduction was ~12 weeks. Incidence and severity of AEs declined following dose reduction, including grade ≥3 diarrhea (11.3% before vs 4.0% after), dermatitis acneiform (15.3% vs 6.7%), stomatitis (3.3% vs 2.7%) and paronychia (7.3% vs 4.7%).
PFS was similar in dose-reduced and all dacomitinib-treated patients (Figure).
Median OS results were also similar (dose-reduced patients: 36.7 mo [95% CI: 32.6, NR]; all dacomitinib-treated patients: 34.1 mo [95% CI: 29.5, 37.7] as were ORRs (dose-reduced patients: 79.3% [95% CI: 72.0, 85.5]; all dacomitinib-treated patients: 74.9% [95% CI: 68.7, 80.4]).8eea62084ca7e541d918e823422bd82e Conclusion
Efficacy was similar in the dose-reduced patients and the overall study population. Incidence/severity of dacomitinib-related AEs decreased with dose reduction, thereby allowing patients to continue treatment.
Wu, et al. Lancet Oncol. 2017.
Mok, et al. J Clin Oncol. 2018.6f8b794f3246b0c1e1780bb4d4d5dc53
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