John Martin
Analyst · JP Morgan
Thank you, Susan. I'm very pleased with our progress during the second quarter. In addition to solid financial results, we advanced a number of programs across our therapeutic areas, achieved several anticipated milestones and presented steady results that set the stage for key events during the second half of this year and in 2012. On the HIV front. Two important milestones occurred since our last earnings call that put us another step closer to the introduction of our next single tablet regiments. First, in May, our partner, Tibotec Pharmaceuticals, announced the FDA's approval of Rilpivirine, their non-nucleoside reverse transcriptase inhibitor. Rilpivirine's indication's for use in combination with other antiretroviral agents for the treatment of HIV in treatment-naive adults. As you are most likely aware, we partnered with Tibotec in July of 2009 to develop a single tablet regimen combining Truvada with Rilpivirine. This potential product is currently under review by U.S. and EU regulatory authorities. We anticipate action by the authorities in both geographies in the second half of this year. The second major milestone was the late breaker presentation of the 48-week data from our pivotal Phase III Study #145 at the International AIDS Society meeting in Rome. The data demonstrated that elvitegravir, our oral HIV integrase inhibitor was not inferior to the integrase inhibitor of raltegravir given via IV in treatment-experienced patients. At 48 weeks of treatment, 59% of patients receiving elvitegravir achieved and maintained HIV RNA levels, less than 50 copies per milliliter compared to 58% of patients receiving raltegravir. Discontinuation rates due to adverse events and safety and resistant profiles were comparable in both arms of the study. This is an important result and is the first from the 4 Phase III studies supporting our Quad elvitegravir and cobicistat programs. Continuing our vision of bringing additional fixed dose and single-tablet regimens forward to meet the individual needs of HIV patients, we announced in June that we entered into a license agreement with Tibotec for the development and commercialization of a new fixed-dose antiretroviral combination product containing cobicistat, our boosting agent, and their protease inhibitor, darunavir. In connection with this agreement, we announced our current negotiations for the development and commercialization of a future single-tablet regimen combining darunavir with Emtriva, cobicistat and our investigation of next generation NRTI GS 7340. Because it is a substantially lower dose than Viread at 300 milligrams, GS 7340 allows for fixed-dose formulations not possible with Viread. And in this case, it would allow for the co-formulation of the first single-tablet regimen containing a protease inhibitor. As we stated at the time of the announcement, the agreement to develop the fixed-dose combination of cobicistat and darunavir is contingent upon signing -- of the signing of the agreement to develop the GS 7340 containing single-tablet regimen. We will continue to keep you posted on our progress. During the quarter, there were also a number of external releases that contributed to the growing body of evidence supporting the use of Viread and Truvada for the prevention of HIV infection. The first was the release of results in May from the HPTN 052 Study, which define treatment as a method of preventing new HIV infections. HPTN 052 is an NIH-sponsored study designed to determine if treatment can prevent HIV transmission between HIV discordant couples. This study was performed in Botswana, Brazil, India, Kenya, Malawi, South Africa, Thailand and Zimbabwe. More than 1,750 HIV-positive individuals were signed to either begin taking a combination of antiretroviral drugs immediately or delay the initiation of therapy until their CD4 counts fell below 250 or they were diagnosed with an HIV-related illness. The results demonstrated that earlier initiation of antiretroviral therapy led to a 96% reduction in HIV transmission to the HIV-uninfected partner. Based on this finding, the study's Data Safety Monitoring Board recommended that the study be stopped early, 4 years ahead of schedule. These data were also the subject of a late-breaker presentation at IAS, which garnered significant interest from the medical community. The results add powerful evidence that treatment benefits the individual and also has a public health benefit in reducing further infections. Another trial known as Partners PrEP was sponsored by the University of Washington and involved 4,758 heterosexual couples, in which one partner was infected with HIV and the other was not. In this Phase III study conducted at 9 sites in Kenya and Uganda, daily use of either oral Viread or oral Truvada by the HIV-negative participants reduced their risk of acquiring HIV by 62% and 73%, respectively. Due to the strong HIV prevention affects seen, the DSMB recommended that results be made public and the placebo arm of the study discontinued. The difference between Viread and Truvada was not statistically significant, but this blind data comparison continues. The other trial known as TDF2 was sponsored by U.S. Centers for Disease Control and Prevention and involved 1,200 HIV-negative heterosexual men and women. Data collected on the smaller cohort throughout the end of the trial indicated that daily use of oral Truvada significantly reduced HIV acquisition by 63%. In both studies, the safety and tolerability was similar to patients taking Viread, Truvada or placebo. As previously indicated, we intend to file for inclusion of the prevention data in our Truvada label and continue our discussions with U.S. FDA to define the content and the timing of the submission. We'll turn briefly to our efforts in hepatitis C. We initiated the first all-oral antiviral study in HCV-infected patients during the quarter. This Phase IIa study is comparing 2 doses of GS 5885 in combination with GS 9451, GS 9190 and ribavirin for 12 and 24 weeks in genotype 1-infected patients. Before the end of the year, we will have started multiple Phase II studies in hepatitis C, evaluating different combinations of compounds in over 2,000 patients. We are evaluating multiple regimens that reduce or eliminate the use of peg-related interferon in both treatment-naive and treatment-experienced patients. I will now turn the call over to Robin to discuss our financial results for the quarter.