Scott Daniel Cormack
Analyst · Leerink Swann
Good afternoon, and thank you for joining us. We will be implementing a new format for the call today in order to address commonly asked questions and to respond to inquiries that have been submitted recently via the IR page of our website. Instead of holding questions until the end of the call, we will open the line up a few times throughout the discussion, and I'll take questions. I'd like to begin by addressing questions we have received regarding the Phase III SYNERGY trial evaluating custirsen in combination with docetaxel for men with metastatic castrate-resistant prostate cancer or CRPC. We're frequently asked why we believe in the potential of custirsen and specifically in the SYNERGY trial when several agents have failed in combination with docetaxel. Quite simply, it comes down to 2 reasons. First, custirsen is unique because of its mechanism of action. Second, there are robust Phase II data in support of the Phase III trial program. I'll first address my mechanism-of-action reference. Custirsen is designed to block the production of the protein clusterin which is overexpressed in a number of cancers. Clusterin stabilizes and supports cancer cells and is upregulated during times of cell stress, for example in response to treatment such as chemotherapy. The more stress or treatments that tumor cell experiences, the more clusterin that can be produced as a result. Inhibition of clusterin is linked to a delay in cancer progression, treatment resistance and tumor growth. When you add custirsen to docetaxel, you are not combining 2 cytotoxic agents, as we've seen in other failed Phase III trials. In the case of the SYNERGY trial, you're combining docetaxel with custirsen. Recall that custirsen is an agent that is designed to disable a natural defense mechanism by which patients are becoming resistant to chemotherapy. Docetaxel is a proven therapy that has been shown to extend survival and improve quality of life, and the goal of custirsen is to improve upon the proven. That leads to the second reason for our belief in our Phase III program: The robust Phase II data supporting the SYNERGY trial. In the randomized Phase II trial, a 6.9-month improvement in survival for custirsen plus docetaxel versus docetaxel alone was observed. We and others have interrogated these [ph] data and haven't come across a reason to disbelieve the results, and so we have confidence in those results. With SYNERGY, we are essentially repeating the same study design but obviously with more patients. We continuously receive questions about the timing and announcement of the SYNERGY data. I'd first like to emphasize that we and our partner Teva remain blinded to all SYNERGY data and analyses. The planned efficacy interim analysis per SYNERGY has not yet occurred. Once the interim analysis has been conducted and the Independent Data Monitoring Committee, or IDMC, has provided their findings, we will provide an update. Regarding the final survival analysis for SYNERGY, we continue to expect them by mid-2014. However results could be announced sooner depending on the results from the interim analysis. It should be noted that the criteria to achieve statistical significance at the interim analysis is considerably more stringent than the criteria required for the final analysis. I'd now like to discuss the implications of the positive Phase III XTANDI interim trial results announced 2 weeks ago. We have received numerous questions as to how the expected use of antiandrogens specifically in the prechemo setting will impact the use of chemotherapy and the market potential for custirsen. Similarly we have received questions about whether we view these agents as competitors for custirsen. As I've previously stated, the goal of custirsen is to improve upon the proven, and we believe this is not limited to just chemotherapy. We do not view these new treatments as competitors, and in fact, preclinical data have been published demonstrating a synergistic effect when custirsen is added to radiation therapy and antiandrogen, such as XTANDI. Importantly positive data and the approval of new agents means more treatment options for patients, and obviously, that is our collective goal. Unfortunately however, despite the introduction of these new treatments, a majority of men are not being cured of prostate cancer and will eventually experience treatment resistance to these antiandrogens and require additional therapies. At this point in this disease, chemotherapy is a rational and expected course of therapy because it has a very different mechanism of action than antiandrogens. With over a decade of experience with docetaxel, oncologists are very comfortable administering chemotherapy to patients with advanced prostate cancer. In addition to the scientific rationale to switch therapies based on a mechanism of action, there continues to be a significant period of time that patients are eligible to receive docetaxel. While XTANDI and Zytiga have extended overall survival and delayed time to progression, once patients do experience progression, the time to death continues to report around 19 months. This is the same as the time of docetaxel treatment initiation to death seen 10 years ago in the regulatory trials of docetaxel. Therefore we believe the market opportunity for chemotherapy remains unchanged, and the biology of custirsen is now even more relevant, given the additional treatments and stress response I discussed earlier. We've also received inquiries regarding the Teva partnership and more recently the resignation of Jeremy Levin as their CEO. Our partnership with Teva was established long before Jeremy's arrival at Teva, and the partnership is with the company, not a single individual. The partnership with Teva remains in effect and unchanged, and our relationship with our collaboration team is as strong as ever. So we expect business to continue as usual. Teva has committed substantial resources to the development of custirsen, and all parties are fully engaged to prepare for potential regulatory filings next year. I think that covers the key questions we have received regarding custirsen. However if there are others, I will open up the line now and take those. Janine, if you would mind just doing a quick break and taking questions from the audience.