− Achieved Fourth Quarter and Full Year 2019 ONPATTRO® (patisiran) Preliminary Global Net Product Revenues of Approximately $56 Million and $166 Million, Respectively –

– As of Year-End 2019, Over 750 Patients Worldwide Receiving Commercial ONPATTRO and Over 1,000 Total Patients Worldwide Being Treated with Patisiran –

– Achieved Strong Initial Demand for GIVLAARI™ (givosiran) in the U.S., with 13 Start Forms Received in First Six Weeks after FDA Approval –

– Maintained Strong Balance Sheet with Year-End Cash and Investments Balance of Approximately $1.5 Billion –

CAMBRIDGE, Mass.--(BUSINESS WIRE)-- Alnylam Pharmaceuticals, Inc. (Nasdaq: ALNY), the leading RNAi therapeutics company, today announced its preliminary* fourth quarter and full year 2019 global net product revenues for ONPATTRO and GIVLAARI and provided additional updates on the products’ commercial launches.

For ONPATTRO, the Company reported:

• Preliminary global net product revenues for the fourth quarter and full year 2019 were approximately $56 million and $166 million, respectively.
• As of year-end 2019, over 750 patients worldwide were receiving commercial ONPATTRO, and over 1,000 total patients worldwide were being treated with patisiran, when also including those patients in clinical studies and in the Company’s global Expanded Access Program (EAP).
• In the U.S., 44% of Start Forms submitted in 2019 came from cardiologists, 38% from neurologists, and 18% from other physician specialties.
• Significant ONPATTRO new patient growth in the fourth quarter was seen in the U.S. and EU, along with a strong launch in Japan.
• In the U.S., Alnylam has now completed definitive value-based agreements (VBAs) with 14 commercial payers, including each of the top 5 commercial payers and 8 of the top 10, with signed VBAs now covering over 130 million U.S. lives in the aggregate.

For the period following approval of GIVLAARI in the U.S. on November 20 through year end, the Company reported:

• A total of 13 Start Forms were submitted.
• Preliminary global net product revenues were approximately $0.2 million representing initial channel stocking.
• The Company has made significant progress toward establishing VBAs, including a Prevalence-Based Adjustment feature, with multiple ongoing discussions with payers.

“In 2019 we achieved continued and steady growth of patients on ONPATTRO and we expect sustained growth in 2020 and beyond. We believe our preliminary results reflect strong patient and physician demand and excellent execution by our commercial teams around the world. With the early U.S. approval of GIVLAARI, we are now a multi-product commercial company, and are pleased with the strong initial interest from patients and physicians in the short period since the drug’s approval by the FDA. We’re also encouraged by the receptivity of U.S. payers to the value that GIVLAARI has the potential to deliver,” said John Maraganore, Ph.D., Chief Executive Officer of Alnylam. “In 2020, we look forward to the continued launches of ONPATTRO and GIVLAARI, bringing the benefits of these innovative therapies to patients around the world. We also look forward to advancing lumasiran – as our third wholly owned RNAi therapeutic – as well as inclisiran – with our partners at Novartis – toward the market in 2020 and achieving additional milestones across our broad late-stage pipeline of investigational RNAi therapeutics, notably in our ATTR amyloidosis clinical programs.”

In addition, the Company today reported that at December 31, 2019, it had preliminary cash, cash equivalents, marketable debt and equity securities, and restricted investments of approximately $1.5 billion, as compared to $1.1 billion at December 31, 2018.

Alnylam management will discuss these preliminary selected financial results and commercial updates during a webcast presentation at the 38th Annual J.P. Morgan Healthcare Conference in San Francisco, California tomorrow, Monday, January 13, 2020, at 10:30 a.m. PT (1:30 p.m. ET).

* The preliminary selected financial results are unaudited, subject to adjustment, and provided as an approximation in advance of the Company’s announcement of complete financial results in February 2020.

About ONPATTRO® (patisiran) ONPATTRO is an RNAi therapeutic that is approved in the United States and Canada for the treatment of the polyneuropathy of hATTR amyloidosis in adults. ONPATTRO is also approved in the European Union and Switzerland for the treatment of hATTR amyloidosis in adults with Stage 1 or Stage 2 polyneuropathy, and in Japan for the treatment of hATTR amyloidosis with polyneuropathy. Based on Nobel Prize-winning science, ONPATTRO is an intravenously administered RNAi therapeutic targeting transthyretin (TTR). It is designed to target and silence TTR messenger RNA, thereby blocking the production of TTR protein before it is made. ONPATTRO blocks the production of TTR in the liver, reducing its accumulation in the body’s tissues in order to halt or slow down the progression of the polyneuropathy associated with the disease. For more information about ONPATTRO, visit ONPATTRO.com.

ONPATTRO Important Safety Information Infusion-Related Reactions Infusion-related reactions (IRRs) have been observed in patients treated with ONPATTRO. In a controlled clinical study, 19 percent of ONPATTRO-treated patients experienced IRRs, compared to 9 percent of placebo-treated patients. The most common symptoms of IRRs with ONPATTRO were flushing, back pain, nausea, abdominal pain, dyspnea, and headache.

To reduce the risk of IRRs, patients should receive premedication with a corticosteroid, acetaminophen, and antihistamines (H1 and H2 blockers) at least 60 minutes prior to ONPATTRO infusion. Monitor patients during the infusion for signs and symptoms of IRRs. If an IRR occurs, consider slowing or interrupting the infusion and instituting medical management as clinically indicated. If the infusion is interrupted, consider resuming at a slower infusion rate only if symptoms have resolved. In the case of a serious or life-threatening IRR, the infusion should be discontinued and not resumed.

Reduced Serum Vitamin A Levels and Recommended Supplementation ONPATTRO treatment leads to a decrease in serum vitamin A levels. Supplementation at the recommended daily allowance (RDA) of vitamin A is advised for patients taking ONPATTRO. Higher doses than the RDA should not be given to try to achieve normal serum vitamin A levels during treatment with ONPATTRO, as serum levels do not reflect the total vitamin A in the body.

Patients should be referred to an ophthalmologist if they develop ocular symptoms suggestive of vitamin A deficiency (e.g. night blindness).

Adverse Reactions The most common adverse reactions that occurred in patients treated with ONPATTRO were upper respiratory-tract infections (29 percent) and infusion-related reactions (19 percent).

For additional information about ONPATTRO, please see the full Prescribing Information.

About GIVLAARI™ (givosiran) GIVLAARI is an RNAi therapeutic targeting aminolevulinic acid synthase 1 (ALAS1) that is approved in the U.S. for the treatment of adults with acute hepatic porphyria (AHP). In the pivotal study, GIVLAARI was shown to significantly reduce the rate of porphyria attacks that required hospitalizations, urgent healthcare visits or IV hemin administration at home compared to placebo. GIVLAARI is Alnylam’s first commercially available therapeutic based on its Enhanced Stabilization Chemistry (ESC) GalNAc conjugate technology to increase potency and durability. GIVLAARI is administered via subcutaneous injection once monthly at a dose based on actual body weight and should be administered by a healthcare professional. GIVLAARI works by specifically reducing elevated levels of ALAS1 messenger RNA (mRNA), leading to reduction of toxins associated with attacks and other disease manifestations of AHP. For more information about GIVLAARI, visit GIVLAARI.com.

GIVLAARI Important Safety Information Contraindications GIVLAARI is contraindicated in patients with known severe hypersensitivity to givosiran. Reactions have included anaphylaxis.

Anaphylactic Reaction Anaphylaxis has occurred with GIVLAARI treatment (