Akshay Vaishnaw
Analyst · Piper Jaffray. Your line is open
Thanks, John, and good morning, everyone. As John highlighted, we've had a productive quarter with many firsts for the company. Let's begin with our programs in hATTR amyloidosis, which include patisiran and ALN-TTRsc02. This undoubtedly was a transformative period for patisiran, with our positive results from the APOLLO Phase 3 study. To recap, patisiran met its primary efficacy endpoint, the change from baseline in the modified neuropathy impairment score, mNIS+7, with a remarkably significant p value of 9.26 x 10-24 and hit all secondary endpoints as well, including the Norfolk Quality of Life score with equally notable statistical significance with a p value of 1.10 x 10-10 at 18 months. The combination of secondary endpoints, which included not only the Norfolk-QOL, but additional readouts in muscle strength, activities of daily living, walking speed, BMI and autonomic function, show the potential for patisiran to uniquely impact patients' lives in a clinically meaningful fashion. In the prespecified cardiac subpopulation, patisiran treatment was also associated with improvement in cardiac structure and function, including a marked improvement in gait speed. These data make patisiran the only therapy, whether investigational or approved, for the treatment of hereditary TTR amyloidosis with evidence of disease reversal in a majority of patients. Based on these data, we recently completed our rolling submission of an NDA to the FDA, where we have breakthrough therapy designation and have also submitted our MAA to the EMA, where we have accelerated assessment status. As John mentioned, we completed both of these regulatory filings in record time and both agencies have accepted our filing. Our PDUFA date from the FDA is August 11. On that note, I too would like to congratulate and thank our teams for these remarkable achievements. Based on these submissions, we expect potential regulatory approvals in the U.S. in mid and in the EU in late 2018. With our recently obtained global rights for patisiran, we're also preparing for global submissions, including the goal of a Japanese NDA in mid-2018 and the filing in one or more additional countries by the end of the year. With 99% of eligible patients from APOLLO having enrolled into the global open-label extension, or OLE, study, we're also looking forward to generating longer-term data for patisiran on safety and efficacy. In addition to patisiran, we're also developing ALN-TTRsc02, and as an investigational RNAi therapeutic for ATTR amyloidosis. TTRsc02 uses our ESC-GalNAc-conjugate platform and allows for subcutaneous route of administration. Earlier reported results in healthy volunteers suggested that a once quarterly fixed dose of either 25 or 50 milligrams could provide the same level of TTR knockdown observed with patisiran. With respect to safety, TTRsc02 was generally well-tolerated, supporting further advancement of this investigational RNAi therapeutic. We believe that these positive results position TTRsc02 to be a promising potential option for ATTR amyloidosis patients. And in light of the unequivocal validation of the TTR knockdown hypothesis from APOLLO, we might as well look forward to advancing TTRsc02 as our next Phase 3 program in late 2018. As John noted earlier, we're excited about the potential for TTRsc02 across the broad spectrum of patients with ATTR amyloidosis. To this end, we're planning on a comprehensive Phase 3 development program that will include studies aimed at confirming safety and efficacy in patients with hATTR amyloidosis, in other words the APOLLO population, and also in patients who are asymptomatic hATTR mutation carriers and the patients with wild-type ATTR amyloidosis. These two later patient groups represented the potential to substantially expand the number of patients who may benefit from TTR knockdown with our investigational RNAi therapeuticTTRsc02. With that, let's now turn to our givosiran program, where we've also made significant progress in recent months. As you know, givosiran is in development for the treatment of hepatic porphyrias. As a reminder, the hepatic porphyrias are a group of ultra orphan diseases caused by genetic defects in the heme biosynthetic pathway. They are a devastating family of disorders with enormous unmet need and economic burden. In porphyria, buildup of toxic heme intermediaries leads to incapacitating and potentially fatal attacks with symptoms that includes severe abdominal pain, peripheral and autonomic neuropathy and neuropsychiatric manifestations. Porphyria attacks are relentless, typically lasting for days and requiring hospitalization. Moreover, many patients suffer from disabling chronic pain in between attack. Recently, we announced the initiation of the ENVISION Phase 3 study of givosiran. ENVISION is a randomized double-blind placebo-controlled study in approximately 75 acute porphyria patients with recurrent attacks. The primary endpoint is the change in annual attack rate relative to baseline for patients treated with givosiran versus placebo at 6 months. ENVISION study design has been endorsed by the U.S., European and Japanese regulatory authorities, and we've reached alignment with the FDA on an interim analysis approach in approximately 30 patients using reductions in levels of urinary ALA at three months as a surrogate endpoint that is reasonably likely to predict clinical benefit. The use of ALA as a biomarker predictive of clinical benefit is based on the role of ALA in porphyria attacks as documented in literature as well as our own data from the Phase 1 study that demonstrated a greater correlation between ALA lowering and diminished frequency of attacks, as seen on Slide 16. In our Phase 1 and Phase 2 early studies, we've also demonstrated over 80% reduction in ALA relative to baseline. So we look forward to potentially confirming this in our Phase 3 interim analysis, which we expect to report in mid-2018. If the interim analysis are positive and pending regulatory support, we'll then be in a position to file an NDA for an accelerated approval based upon the interim study data at or around year-end 2018, representing a significant acceleration in our efforts to bring this promising investigational medicine to patients. We're also announcing today that our interim analysis will include a blinded assessment of the rate of porphyria attacks to enable potential adjustment in the study sample size from approximately 75 to approximately 94. We believe this is a prudent measure to ensure that the study is robustly powered and to guard against patients in either arm that might have fewer porphyria attacks compared to those studied in our Phase 1/2 program. Because this interim analysis is conducted on a blinded basis, a robust treatment effect in the drug arm might also lead to a decision to add additional patients, resulting in an overpowered study, which, of course, is always a good thing. Accordingly, we believe it's best for people to expect that we'll be triggering the study expansion to 94 patients. That said, even with adding 20 patients, we still fully expect the readout to be in 2019 and the study expansion will not impact the conduct or timing of our interim analysis of urinary ALA lowering in mid-2018 and if positive, our planned NDA submissions by year-end 2018. Let's now turn to our fitusiran program, an investigational RNAi therapeutic for the treatment of hemophilia and rare bleeding disorders. As a reminder, fitusiran targets antithrombin, or AT, and is designed to increase thrombin generation and thus, provide hemostasis in peak with hemophilia. In the fourth quarter, following a successful Type A meeting outcome with the FDA, we aligned on clinical safety and risk mitigation measures that include a protocol specified guidelines and additional investigator and patient education concerning reduced doses of replacement factor or bypassing agent to treat any breakthrough bleeds and education on sizes and symptoms of a clot. This resulted in the lift of the temporary clinical hold on fitusiran and resumption of dosing in the Phase 2 early study late last year. We and our partners at Sanofi have now reinitiated our ATLAS Phase 3 program, with resumption of dosing expected in the coming weeks. As a reminder, ATLAS is a broad-based program that is designed to evaluate the efficacy and safety of fitusiran in patients with hemophilia A or B with or without inhibitors, where the patients are receiving on-demand or prophylactic replacement therapy. ATLAS will enroll approximately 250 patients in three separate studies and over 100 clinical centers around the world. Under our restructured collaborations, Sanofi will assume global development responsibility and global commercialization rights for fitusiran and will oversee patient enrollment in ATLAS following an approximately six-month handover period. As a once monthly subcutaneous medicine without peaks and troughs of replacement factor therapy, we and our partners at Sanofi remain very excited about the potential for fitusiran in hemophilia and other rare bleeding disorders. We fully expect that Sanofi's recent announcement to acquire Bioverativ will not only assist in maximizing fitusiran's commercial prospects, but will also aid in the efficient and timely development of this promising investigational medicine. Another late stage state program in our pipeline is inclisiran, our investigational RNAi therapeutic targeting PCSK9, is being developed collaboration with our partners at The Medicines Company. Recently, we and The Medicines Company announced initiation of a comprehensive Phase 3 program for inclisiran, consisting of ORION-9, -10 and -11 trials in patients with heterozygous familial hypercholesterolemia or with ASCVD, with or without additional risk factors. As John mentioned, Medco has guided that the timelines to complete patient enrollment have exceeded previous expectations, with the ORION-11 trial completing randomization of 1,500 patients in just 11 weeks, about 17 weeks sooner than expected. ORION-9 and -10 trials are actively enrolling, also ahead of schedule, and are expected to complete enrollment during the first half of 2018. Of interest, the FDA also recently granted inclisiran orphan drug status for the treatment of homozygous familial hypercholesterolemia, underscoring the potential of inclisiran in the highest unmet need population in addition to unmet need in the broader secondary prevention hypercholesterolemia market. Inclisiran remains a very important product opportunity for Alnylam in light of our significant economic participation in the value of the program. In addition, we stand to benefit greatly from the substantial safety data we obtained from the program and how it supports the overall safety profile of our ESC-GalNAc-conjugate platform. To this end, we have a close working relationship with Medco related to safety monitoring in the ORION program and we're encouraged by the safety reports we've reviewed to-date. During the fourth quarter and recent period, we also made good overall progress in some of our earlier stage programs, most notably with lumasiran, formerly known as ALN-GO1, showing exciting initial efficacy in a small number of patients with primary hyperoxaluria type 1, or PH1. As a reminder, PH1 is an ultra-rare orphan disorder, in which oxalate crystals build up in the kidney, leading to painful and recurrent kidney stones and damage to extrarenal tissues, primarily in children. Treatment options are limited and typically involve chronic dialysis and often a dual liver and kidney transplant. Lumasiran targets the enzyme glycolate oxidase, thereby depleting the substrates necessary for the production of oxalate, which directly contributes to the pathophysiology of PH1. We recently presented initial patient data from Part B of the ongoing Phase 1/2 study of lumasiran. Part B is a randomized single-blind placebo-controlled study designed to enroll up to 24 PH1 patients aged 16 to 19 years of age, representing our first ever pediatric experience. In the initial two cohorts, lumasiran achieved substantial reductions in the urine oxalate levels in all patients, supporting the hypothesis that RNAi-mediated inhibition of GO1 can reduce and potentially normalize hepatic oxalate production, thus, potentially halting PH1 disease progression. In the first lowest dose cohort, urinary oxalate levels were reduced by up to 74%, with all patients reaching the normal urinary oxalate levels. With respect to safety, lumasiran was generally well tolerated, with no treatment-related serious adverse events or study discontinuations up to seven months after initial dosing. We aim to discuss these data with the regulators and rapidly advance lumasiran towards Phase 3 clinical studies. Notably, we believe that the level of urinary oxalate could be considered a surrogate endpoint for approval. In the meanwhile, lumasiran is a potential global pick for Sanofi as part of our 2014 agreement, in which case Sanofi would assume the development and commercial lead of the program with Alnylam receiving significant milestones and royalties up to 20%. We have now triggered the process whereby Sanofi will consider opting in, and we expect to hear of their response in the next few months. Of course, Sanofi may also decline their option for any number of reasons, including for portfolio reasons related to their recent acquisitions. Of course, if Sanofi elects to decline its opt-in, we would keenly advance lumasiran towards Phase 3 studies, potentially, later this year. Finally, as John mentioned, we're also advancing our cemdisiran program in complement-mediated diseases, advancing one or more CTAs in 2018 and continuing to invest in our future with bold initiatives such as the UK Biobank consortium. In summary, we've had a very exciting final quarter in 2017 and in the recent period. Having now advanced the pipeline with four programs in Phase 3, with one under regulatory review and multiple earlier stage programs. With that, I'll now turn the call over to Manmeet for a review of our financials. Manmeet?