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MINI 30 - New Kinase Targets (ID 157)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
MINI30.06 - Activity of AUY922 in NSCLC Patients With EGFR Exon 20 Insertions (ID 1744)
18:30 - 20:00 | Author(s): L. Fulton
EGFR exon 20 insertions (ins20) represent a rare subtype (4%) of EGFR mutations and are refractory to EGFR-specific tyrosine kinase inhibitors (TKIs). No effective targeted therapies exist for patients (pts) with ins20; median PFS on the irreversible EGFR TKI Afatinib is 2.8 months (mos). Based on a durable RECIST partial response (PR) to AUY922, a Heat Shock Protein 90 (Hsp90) inhibitor, observed in an EGFR ins20 patient in a previous study (NCT01124864), we designed a phase II investigator-initiated trial to assess the activity of AUY922 in NSCLC pts with EGFR ins20. Since pts with these mutations are rare, we identified other international investigators who have treated ins20 patients with AUY922. Here, we present the results of a pooled international experience of 21 patients with EGFR ins20 treated with AUY922 in the United States, Taiwan and the Netherlands.
A total of 21 patients with EGFR in20 are included in this analysis. 14 were treated on a single-arm, multi-center, open-label study of AUY922 in advanced NSCLC pts with EGFR ins20 mutations in the US (NCT01854034). Five were treated on a multicenter Taiwanese trial of AUY922 across a variety of molecular NSCLC subtypes (NCT01922583) and two were treated on a compassionate-use basis in the Netherlands. The starting dose of AUY922 was 70mg/m2 IV weekly for all patients.
21 pts, including 14 females and 7 males, average age 55 (range, 27-75) were included in this analysis. The median number of prior therapies was 2 (range, 1-6.) 6 pts received a prior EGFR TKI; none responded to TKI monotherapy. The most common AUY922-related toxicities were grade 1-2 visual changes (18/21; 86%) diarrhea (18/21; 86%) and fatigue (15/21; 71%). The only treatment-related grade 3 toxicities was hypertension (2/21; 1%) and AST elevation (1/21; 0.5%). There was one death on study, related to pre-existing comorbidity/unrelated to AUY922. Among the 21 patients treated, 5 achieved a partial response by RECIST 1.1 (ORR 24%) (Figure 1.) The median PFS estimate is 3.9 mos (95% CI, 2.9 to 10.7.) 6 patients remain on treatment at the time of abstract submission. Updated results and correlation with specific ins20 mutations will be presented. Figure 1
This international experience suggests that AUY922 may be an active therapy for advanced NSCLC pts with EGFR ins20 mutations with an ORR 24% and median PFS 3.9 mo. AUY922 is generally well-tolerated, though reversible low-grade ocular toxicity is common. Further study of AUY922 in this population is warranted.
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