Dr. Laurence Cooper
Analyst · Raymond James. Your line is now open
Thanks, David and good afternoon everyone. As mentioned, one cornerstone to Ziopharm's future is our TCR-T program for solid tumors, for which we have made significant progress, even since our last call. Let me start by updating you on our clinical work at the NCI. As a reminder, this trial evaluates the infusion of T cells that are genetically modified with the Sleeping Beauty system to express one or more TCRs targeting personal neoantigens. The trial is under the control of Dr. Rosenberg and his team. We are pleased that the IND with the NCI is for a Phase II trial, which is a positive change since our last quarterly call. To highlight, the primary endpoint now being tumor response rate. The patients will be closely followed at the NCI with participants seen in clinic every few months, Thus, we will learn a great deal from each and every patient enrolled and associated data will likely be available in the weeks and months following the T cells infusions. Recall that Dr. Rosenberg is enrolling patients with a range of solid tumors, which will reveal how T cells tackle a variety of cancers. We will learn how each tumor type succumbs to the T cell infusions. We will learn how these T cells target tumor, which includes persistence and trafficking to the sites of cancer. I want to provide you with a sense of the opportunity for Ziopharm based on our CRADA with the NCI. Dr. Rosenberg estimates that T cells can recognize cancer antigens in over 80% of patients with tumors. There are approximately 1.5 million new cases of solid tumors each year in the United States. The solution we are developing with Dr. Rosenberg can target most, 80% or so, of these patients, which represent a massive opportunity for us. The Sleeping Beauty system was selected for this trial given the significant human experience and clinical responses seen upon administration of CD19 specific CAR. Furthermore, Dr. Rosenberg's team has demonstrated and published that the Sleeping Beauty system can be used to genetically modify clinical grade T cells to express neoantigen specific TCRs. We are in close dialogue with Dr. Rosenberg and like you, await the first patient dose. The next step is then opening enrollment to a broader number of patients and indications. While Ziopharm does not control the timing and release of the NCI's data, we do know that information on even a small number of patients can result in significant value creation. It's important to note why we are so confident that this technology will work. There are 4 important clinical data points in support of this assertation. The first is that we know T cells can target solid tumors. This is primarily based on the infusion of tumor infiltrating lymphocytes, or TILs, in some patients with melanoma. The second is the understanding that TILs successfully targeting tumors, do so via their T cell receptors, or TCRs that recognize cancers' neoantigens. The third is that TILs, which are not genetically modified, typically run out of gas and struggle to target tumors other than melanoma. And fourth and last is that the genetic engineering can insert the neoantigen specific TCRs into young T cells derived from the peripheral blood that can therefore recycle their killing. Ziopharm built upon these clinical experiences using the following 3 scientific advances to create a leading TCR-T therapy for solid tumors. Firstly, we developed a scalable, low-cost, non-viral approach to genetic engineering of T cells based on the Sleeping Beauty System. Second, we used this system to genetically modify T cells from peripheral blood, which overcomes infusing tired or exhausted T cells from TIL. And third, we harnessed the Sleeping Beauty system's ability to scale to meet the needs of patients and the demands of commercialization. For example, multiple TCRs will be needed, whether for personalized T cell therapy, targeting individual targets, or infusion of T cells, targeting hot spots. This work, beginning with our partnership at the NCI, has resulted in an open IND for a Phase II trial, exclusivity to key intellectual property surrounding the TCRs and T cell manufacturer, ide to operate, and now, the relationship with MD Anderson to execute on our own clinical TCR trials. This brings me to our next update on the TCR-T program, which is the recently announced R&D agreement with MD Anderson. This was months in the making and we are delighted to strengthen our engagement with them. The excitement is reciprocal as we've already secured buy-in from multiple oncology subspecialties and leading investigators within MD Anderson, wanting to work with Ziopharm. The agreement accomplishes the following 3 things for us. Firstly, we are partnering with the largest cancer center in the world and we now enjoy access to more patients than we could at any other single center. Secondly, it accelerates the expansion of the initial library of TCRs and hotspots in 3 important families of genes that really drive cancer biology. In other words, KRAS, TP53, and EGFR. And lastly, it allows us to implement Ziopharm-led clinical trials for solid tumors. We believe the initial TCR library from the NCI already provides us a competitive advantage. This library covers multiple mutations and maps to a diversity of HLA molecules. In other words, the current library will enable us to enroll existing patients at MD Anderson, and increasing the library will further broaden the application. There are three additional points I would like to make regarding TCRs from the library, with respect to trial design. Firstly, the TCR library allows us to simply screen patients for hotspot mutations, which will reduce the time to deliver cancer targeting T cells to weeks. Secondly, we already had enough TCRs in our library to begin a clinical trial at MD Anderson. And lastly, the larger the library, the greater the number of patients that can be treated and the greater the likelihood of success. In addition to accelerating the pace of growth at the TCR library, this new agreement with MD Anderson provides a foundation for 2 new Ziopharm led clinical trials. The first is a trial utilizing TCRs from the library, targeting hotspots inpatients that are rapidly screened with a simple blood test. The second is if the patient does not have a mutation in a hotspot, then much like the NCI trial today, we will execute on a protocol to manufacture a personalized product for individual neoantigens. We are making great progress and look forward to providing more color on the timing of these trials early next year. With regard to next generation technologies in TCR-T, we are pleased to present preclinical data this December at the American Society of Hematology on the rapid personalized manufacture, or RPM, of TCR-T, which is based on the co-expression of TCR and membrane bound IL-15 using the Sleeping Beauty system. To achieve success in our path to cure solid tumors, we must have a playbook, be in control of our development, and be aligned with the leading cancer centers to run the groundbreaking trials. We have achieved all three over this past year. Finally, a summary on our other two programs before I turn the call over to Satyavrat for a financial update. Turning to our CAR-T program. This is our second T-cell therapy program, also build on the Sleeping Beauty platform. And it's based on the rapid personalized manufacture, or RPM, of CD19 specific CAR-T. The goal of the program is to prove that we can dose cells with 70% viability or greater, as soon as the day after gene transfer, and demonstrate that the cells grow under the control of membrane-bound IL-15 to target tumor, as they did in preclinical models. Since we have the rights to the technology in the only approved CAR to date, we think the fastest path to human data is the most important path. As a result, we uncovered an opportunity in patients who have limited therapeutic options available to them, wrote the IND, and obtained clearance all this year. We announced on October 1st that the FDA had cleared an IND for a Phase I clinical trial. We will evaluate infusion of donor-derived RPM CAR-T in patients with CD19 expressing leukemias and lymphomas who have relapsed after allogeneic bone marrow transplantation. This study will be conducted at MD Anderson. Ziopharm remains committed to our work for the autologous RPM program targeting CD19. In addition, Eden BioCell is actively planning on an autologous trial in greater China and has made steady progress establishing a clinical network of hospital sites and undertaking steps to facilitate regulatory submissions. Turning to our controlled IL-12 program. In August, we are pleased to report the supported data from the Phase I monotherapy trial were published in Science Translational Medicine. A link to that publication can be found on our website. We had benefited from progress in the enrollment to our combination studies with both Opdivo and Libtayo, and we continue to monitor those patients enrolled in the monotherapy expansion study. The 12 additional patients in the Opdivo trial have now been enrolled. The first 6 patients in the Libtayo study have been enrolled and those patients are nearing the end of the required monitoring period before we resume enrollment. We are preparing our 2 poster presentations for the Society of Neuro-oncology later this month. As we did at ASCO earlier this year, we plan to present interim data for both the monotherapy study and the Phase I combination study with Opdivo. And now, we'll hear from our CFO, Satyavrat Shukla, with a financial commentary related to Q3.