a) An increase in overall survival was observed in adenocarcinoma patients treated with ganetespib plus docetaxel. A median overall survival of 7.4 months was observed in the docetaxel control arm, while median overall survival had not been reached in the ganetespib arm. Results for docetaxel were consistent with results from prior second line non-small cell lung cancer (NSCLC) therapy trials.
b) Objective response rate and progression-free survival in adenocarcinoma patients were also improved: from 8% to 16%, and from 2.8 months to 4.2 months, in the control arm vs. ganetespib arm, respectively. Overall response and progression-free survival rates in the control arm were consistent with results from prior trials with docetaxel in this setting.
c) Results in several GALAXY patient subpopulations, defined by pre-specified clinical and biomarker characteristics, showed a substantially improved survival difference between the control arm and ganetespib arm, as compared with the difference in the all-comer (intent-to-treat) adenocarcinoma patient population. These findings have been incorporated into the design of the Phase 3 portion of the GALAXY program, with the objective of enriching for patients likely to derive the greatest benefit from ganetespib treatment.
d) Clinical and preclinical results were presented that suggest potent ganetespib anti-angiogenic activity. Analyses of tumor samples from patients treated with ganetespib showed a reduction of levels of hypoxia induced factor (HIF) and vascular endothelial growth factor (VEGF). In addition, preclinical experiments demonstrated strong inhibition of tumor vasculature by ganetespib. These results suggest ganetespib offers a novel way to inhibit angiogenesis: reducing production of angiogenesis factors, rather than targeting those signaling factors directly with an antibody (e.g. bevacizumab) or a kinase inhibitor.
e) A favorable safety profile was observed with the ganetespib plus docetaxel combination in adenocarcinoma patients. Transient, mild-to-moderate diarrhea was the most common adverse event, consistent with observations from other clinical trials evaluating ganetespib.