Bassil Dahiyat
Analyst · Oppenheimer. Your line is now open. Your question please
Thanks Hannah and good afternoon everyone and thank you for joining us on today's call. We will be reviewing the first quarter as you can see we've already had a very busy start to the year. We kicked off 2015 with topline clinical data from our two lead internal programs XmAb 5871 and XmAb 7195 and I’ll review that in brief in a moment. We also completed an equity offering in February, which raised net proceeds of over $115 million. This financing will greatly facilitate our strategy to broaden and independently advance our proprietary pipeline of novel antibodies including a range of bispecific antibodies using our newest XmAb FC domain. Now major activities for the rest of the year will include initiating clinical testing of XmAb 5871 in a newly defined rare disorder IgG4-related disease. It’s an important opportunity for us because of the attractive clinical development and commercial landscapes for B-cell inhibitor such as 5871 in this newly defined disorder. For XmAb 7195, we will continue to enroll patients in part two of the two part Phase Ia study and we look forward to reporting topline data from this part of the study which is on the high IgE subjects. Also, we’ve advanced XmAb 14045, our bispecific oncology antibody for acute myeloid leukemia in preclinical development and expect to start clinical trials in 2016. We have additional bispecific oncology antibodies in preclinical development as well. Now I’ll review highlight from the data we announced for our clinical programs earlier this year. Now to remind you, XmAb 5871, is our first-in-class B-cell inhibiting antibody containing our proprietary XmAb and immune inhibitor FC domain. It targets the receptor Fc-gamma R2b, via its FC domain in a target CD19 through its variable domain. There by engaging Fc-gamma R2b inhibitor function on B-cells. In January, we reported topline results from a Phase Ib/2a study in rheumatoid arthritis showing promising auto immune disease modifying activities specifically a 33% or 5/15 rate of remission were low disease activity by the -28CRP criteria at two weeks post final dose. This was the protocol specified disease activity measure in time point. We also saw a 20% ACR70 or reduction in the ACR symptom scale by 70% or greater and 40% ACR50 or production of symptoms by 50% or greater. Now the study was also designed to determine the safety and tolerability profile of XmAb 5871 and it show that it was generally well tolerated. The most common 5871 treatment related adverse events observed were predominately milt to moderate gastrointestinal toxicities including nausea, vomiting and diarrhea that occurred during the first infusion of 5871. These GI adverse events, typical y did not reoccur on subsequent infusions and no infusions were discontinued to these. Now treatment related serious adverse event s occurred in two patients that received 5871, these were an infusion related reaction and venous thrombosis. As well as, two patients have placebo had serious adverse events. Now this data from this Phase Ib/2a trials, the first demonstration of our novel mechanism of action of FC-gamma R2b targeting that was data to show that we could treat an autoimmune disease by hitting this pathway. Not this data supports the potential of this non-depleting and highly potent way of inhibiting B-cells. We plan to present the full data from this study in an upcoming medical conference this year and we also plan to start a clinical trial in IgG4 related disease this year. Now IgG4 related disease is a fibro-inflammatory autoimmune disorder that affects approximately 10,000 to 20,000 patients in the United States. It’s newly defined and there are no currently approved therapies. Corticosteroids are currently the standard of care treatment. Now it appears that IgG4 positive plasmacytes, which are cells that progeny of B-cells play an important role in disease process. So B-cell inhibition has significant potential as a treatment modality. The travel planning is an open-label pilot to assess disease control activity as measured by the IgG4-RD responder index, a response metric recently published by leading clinicians. Now turning to our second clinical program, XmAb7195 this is our antibody that targets IgE with its variable domain and uses an identical XmAb immune inhibitor Fc domain as 5871. In this context of IgE binding the Fc domain both inhibits B-cells, in this case just the IgE expressing B-cells, as well as rapidly targeting IgE for clearance from the circulation. In January, we reported topline interim data from part one of our two part ongoing Phase 1a study in healthy volunteers in allergic subjects. Now the part one data showed that our drug is very potent with 90% of healthy volunteer subjects having a reduction of circulating free IgE to below the limited detection by the end of the 7195 infusion. Now that’s 95% of those subjects had a detectable free IgE response pre-dose. Now that included those at the lowest doses evaluated of 0.3 milligrams per kilogram. Now two subjects in this single ascending dose study with high pre-dos IgE levels that is above 300 units national units per mill which were treated XmAb 7195 now these two subjects one was at 0.7.5 milligram per kilogram dose level and one was at the 3 milligram per kilogram level, both had reduction of free IgE levels below the limited detection lasting for at least a week. Now we did observe a dose limiting toxicity of transient asymptomatic thrombocytopenia or platelet reduction that was observed at the 3 milligram per kilogram dose level. We also observed moderate urticaria hives in some treated subjects with apparent correlation of dose with the frequency of occurrence of urticaria. Now in all cases, regardless of dose the urticaria was signs and symptoms were mild, non-diffuse and easily treated with oral antihistamine. We’re continuing to enroll patients in the high IgE subject portion of this trail or part two of the study, and we’re planning a multi-dose Phase 1b study as well as developing subcutaneous formulation of XmAb 7195. We believe 7195 has the potential to provide a first-in-class mechanism for reducing IgE that will address the full spectrum of severe asthmatics, including the hardest to treat people with high IgE levels. Next I would like to turn to the newest aspect of Xencor’s portfolio , our XmAb bispecific technology. Now our bispecific program use a novel Fc domain to serve as the scaffold for antibodies with two different antigen binding domains, creating a molecule that can bind two targets simultaneously hence the name bispecific. By using a plug and play Fc domain is the basis for our bispecific structure, we can develop a very flexible approach that lets us create candidates by combining any two binding domains, while potentially maintaining the beneficial properties of full length antibodies, such as favorable in-vivo half-life and simplified manufacturing. We also hope that this modularity lets us to engineer potency levels to improve the tolerability of the cancer immunotherapy which are currently quite toxic. XmAb 14045 is our lead by specific program and its target CD3 on T-cells to direct cytotoxic T-cells to the other targeted antigen which is CD123 on acute myeloid leukemia cells. It showed very effective and potent depletion of target cells in primate studies from a well tolerated single IV dose. In addition manufacturing scale up is under way for this molecule using standard antibody production methods. We hope to offer product profile of simple and efficient manufacture, convenient well tolerate dosing and high potency. And we expect to initiate clinical trials for XmAb 14045 in 2016 and in addition we planned to advance to the clinic one more oncology bispecific candidate in 2016. Now in conclusion regarding the team here at the Xencor, in March of this year, we announced the appointment of Bruce Montgomery M.D to our board of directors. Currently Bruce serves as Chief Executive Officer of Cardays pharma and he has more than 25 years of drug development operations and financing experience in the Life Sciences industry. With strong medical reputation coupled with his expertise in drug development is a great addition to the board. With that I’ll now turn the call over to John to review our financials.