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OA 05 - Next Generation TKI (ID 657)
- Event: WCLC 2017
- Type: Oral
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:James Chih-Hsin Yang, Fiona Blackhall
- Coordinates: 10/16/2017, 15:45 - 17:30, Room 301 + 302
OA 05.03 - Clinical Activity of ASP8273 in Asian Non-Small Cell Lung Cancer Patients with EGFR Activating and T790M Mutations (ID 7889)
15:45 - 17:30 | Author(s): K. Takeda
Epidermal growth factor receptor (EGFR) activating mutations confer sensitivity to tyrosine kinase inhibitor (TKI) treatment for non-small cell lung cancer (NSCLC) and occur in ~50% of East Asian patients with NSCLC. While initial TKI treatment can be effective, acquired resistance inevitably develops with a secondary mutation (T790M). ASP8273 is a highly specific, irreversible, once-daily, oral, EGFR TKI which inhibits both activating (eg, exon 19 deletions, L858R) and resistance (eg T790M) mutations.
This dose-escalation/dose-expansion study (NCT02192697) was conducted in two phases. In Phase 1, adult Japanese patients (≥20 yr) with NSCLC previously treated with ≥1 EGFR TKI were enrolled and received escalating ASP8273 doses (25–600mg) to assess safety/tolerability as well as to determine maximum tolerated dose (MTD) and/or recommended phase 2 dose (RP2D). In phase 2, adult T790M-positive NSCLC patients in Japan, Korea, and Taiwan were enrolled to further define the ASP8273 safety/tolerability profile at RP2D and determine antitumor activity (assessed using RECIST v1.1). Antitumor activity in phase 2 was evaluated according to Simon’s 2-stage design (uninteresting response=0.3, desired response=0.5, α=0.05, β=0.1). If ≥9 of 24 ASP8273-treated patients achieved a desired response in the first stage, then 39 additional patients would be enrolled. If ≥ 25 of the 63 total patients achieved response, ASP8273 would be considered to have antitumor effects.
A total of 123 patients (n=47 phase 1; n=76 phase 2) were enrolled. In both phases, more women were enrolled. The median age was 65 years in phase 1 and 63 years in phase 2. Based on phase 1 findings, MTD and RP2D were 400mg and 300mg, respectively. As 27 of the 63 patients treated with ASP8273 300mg in the first and second stages combined achieved a clinical response (based on independent central review), ASP8273 was determined to have antitumor activity (ORR=42.9%; 95% CI: 30.5–56.0). The ORR at week 24 in all patients in the full analysis set was 42.1% (n=32/76; 95% CI: 30.9, 54.0). The median duration of PFS (central review) was 8.1 months (95%CI: 5.6,--). The most commonly reported treatment-emergent AEs (TEAE) in phase 2 were diarrhea (n=50/76), nausea (n=31/76), increased alanine aminotransferase (n=27/76), decreased appetite and vomiting (n=26/76 each), and hyponatremia (n=25/76). Drug-related TEAEs were reported in 93.4% (n=71/76) of patients, the most common of which was diarrhea (n=43/76).
ASP8273 was generally well tolerated and demonstrated antitumor activity in Asian patients with both EGFR activating and T790M mutations.
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