Safi R. Bahcall
Analyst · ALK-positive patient population strategy
Thanks, George, and thank you all for joining us this morning. The past few months have been very exciting here at Synta, and we have a lot more news expected over the coming months, including clinical results that will be critical for how we think about registration for ganetespib, our lead drug candidate for cancer. Ganetespib is being developed along 2 distinct but complementary paths: as a monotherapy for the treatment of certain genetically defined cancer populations, and in combination with chemotherapy, in broader patient population. These approaches are evaluating 2 distinct mechanisms of ganetespib. The monotherapy approach evaluates the ganetespib ability to suppress certain oncogenes, known to drive the growth of specific tumors, such as ALK or HER2. The combination approach, to evaluate for chemo-sensitizing ability of ganetespib. Ganetespib is very effective at inhibiting certain proteins, which drive resistance to chemotherapy. These include hypoxia-induced factor, or HIF, as well as several DNA repair and cell cycle proteins. I'll start with where we are and what's coming up in our combination therapy program. You may remember that our Phase IIb/III GALAXY trial has quite an innovative design. The first stage of this trial is neither a classic Oncology Phase II trial nor is it designed as a classic Phase III trial. It is a 240-patient biomarker signal finding lead-in to the Phase III portion of the study. The Phase IIb portion is effectively a dress rehearsal for the Phase III portion, designed to identify patients most likely to benefit. We invest more early on to de-risk later on. From an interim analysis conducted in June, we identified 3 meaningful signals in GALAXY, all based on prespecified hypotheses. The first hypothesis is enhanced activity in patients with elevated levels of LDH and enzyme that can be a marker of hypoxia, which means low oxygen. We specify this hypothesis because hypoxia is a well-known driver of many aggressive tumor properties, such as angiogenesis and metastasis. Because ganetespib is very good at shutting down the hypoxia pathway, we were looking for enhanced activity in tumors where these hypoxia pathways are more active. And that's what the interim analysis showed. The second hypothesis is enhanced activity in patients with mutant KRAS, which is based both on the underlying biology and the activity we saw with ganetespib in other clinical trials. While the results are quite early there, we're also seeing encouraging trend in this population. Finally, the third signal we've seen in GALAXY to date is a difference in activity profiles between patients with adenocarcinoma and squamous cell histology, similar to what's seen with VEGF or angiogenesis inhibitors. This is consistent again with a known preclinical experiments with ganetespib, which shows that it inhibits angiogenesis and it inhibits VEGF. So what we're seeing is encouraging early evidence that ganetespib is changing the biology of tumors. Ganetespib is making tumors less aggressive, less metastatic, less angiogenic and more sensitive to chemotherapy. The data we have are, of course, early, and this is clinical development. We have to stay tuned for the end of the trial. We expect mature results from the Phase IIb portion in the first half of 2013. In the near term, we've been asked if we can provide details on what to expect at the ESMO Oncology Meeting at the end of September. An updated interim analysis is planned for September. We expect there will be incremental information compared to June, so there's just a 3-month difference since the prior analysis. Until this new analysis is complete and reviewed with investigators and the presentation is finalized, we cannot provide additional guidance. In the longer term, based on our current estimates, we expect we would be in a position to file an NDA, or New Drug Application, for registration in 2014. Switching to our monotherapy trials in genetically defined cancers, we've recently initiated our global KRAS study in ALK-positive lung cancer and our global ENCHANT trial in HER2-positive and triple negative breast cancer. We are excited about the potential for ganetespib to provide benefit to patients and these targeted indications, and are looking forward to results from both over the coming several months. Finally, we've been very pleased with the feedback and reaction from the medical community since we presented GALAXY interim results at ASCO. The favorable safety profile and randomized trial, which is consistent with the data from many prior studies with ganetespib, together with the evidence of broad antitumor activity, as shown to many, the ganetespib is positioned to be the first Hsp90 inhibitor to be available for patients. This is reflected in the many requests we have received over the past several months for cooperative group studies, foundation supported studies and investigative supported studies. We have been very pleased that in the past quarter, 4 such studies began enrolling patients, including studies in lung, breast and rectal cancers, as well as multiple myeloma. All of these are at top-tier academic centers, and we expect all of these to advance both the science and the clinical development of ganetespib. GOG [ph] said that ganetespib third-party supported trials plant the seeds for future expansion of this program. These are future applications above and beyond the most direct next set of trials for ganetespib, which include certain genetically defined cancers, as well as expanding more broadly into the taxing indications, including lung, breast, gastric, prostate, ovarian and head and neck cancer. I will now turn the call over to Keith Ehrlich, who will briefly review our financial results.