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PL03 - Presidential Symposium (ID 428)
- Event: WCLC 2016
- Type: Plenary
- Presentations: 1
PL03.09 - Phase 3 Study of Ganetespib, a Heat Shock Protein 90 Inhibitor, with Docetaxel versus Docetaxel in Advanced Non-Small Cell Lung Cancer (GALAXY-2) (Abstract under Embargo until December 6, 7:00 CET) (ID 5232)
08:35 - 10:25 | Author(s): V. Kovcin
Heat shock protein 90 functions as a chaperone to stabilize oncoproteins. Ganetespib (G), a highly potent Hsp90 inhibitor, has demonstrated efficacy in combination with docetaxel (D) over D alone in the second-line therapy of patients with advanced adenocarcinoma of the lung in a phase 2 study.
GALAXY-2 is a randomized (1:1), international, open-label study of D with or without G. Patients with advanced (stage IIIB/IV) non-small cell lung cancer (NSCLC) of adenocarcinoma histology, EGFR and ALK wild-type, diagnosed ≥ 6 months prior to study entry, one prior systemic therapy and ECOG PS 0-1 were eligible. D was given at 75 mg/m on day 1 of three-week cycle; D was given on day 1 with G at 150 mg/m[2 ]on Days 1 and 15 of each cycle. Patients were stratified by performance status (PS), LDH, and geographic region. Primary endpoint was overall survival (OS). Secondary endpoints included progression free survival (PFS) and OS in elevated LDH (eLDH) patients. We report the results of a planned interim analysis at 336 events, which occurred on October 5, 2015, with type I error level set at 0.01 (2 sided stratified log-rank test).
677 patients were randomized with 335 patients in G+D arm and 337 patients in D arm. Baseline characteristics: females 60%, age < 65 68%; never-smoker 18%; PS 0 36%; eLDH 29%; North America/Western Europe 39%. The median number of cycles delivered was 5 in G+D and 4 in D arm. There was no difference in median OS (mOS) for the two arms: 10.9 months with G+D versus 10.5 months with D alone. The hazard ratio for OS was 1.111 (95% CI 0.899-1.372), which met the early stopping criteria for futility. Median PFS was similar in the two arms: 4.2 versus 4.3 months, G+D and D, respectively (HR 1.161, 95% CI 0.961-1.403). There was no improvement with the addition of G for any secondary endpoint, including survival in the eLDH and EGFR and ALK negative populations, response rate, or progression due to new metastatic lesions. The most common grade 3/4 treatment-emergent adverse event in both arms was neutropenia (31.1% versus 24.3%, G+D and D, respectively).
The addition of ganetespib to docetaxel did not result in improved efficacy for salvage therapy of patients with advanced stage lung adenocarcinoma.
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