Fourth-Quarter and Full-Year 2019 Orphan and Rheumatology Segment Results slide image

Fourth-Quarter and Full-Year 2019 Orphan and Rheumatology Segment Results

Today We Are in Our Strongest Position Ever Key Takeaways TEPEZZA U.S. commercial launch underway First and only FDA-approved medicine for patients with thyroid eye disease Highly experienced team working with stakeholders since July 2019 Encouraging early launch progress Advancing KRYSTEXXA immunomodulation strategy • OMIRROR OL trial demonstrated 79 percent of patients achieved complete response (1) MIRROR RCT underway to potentially expand prescribing information · Maximizing growth drivers through additional R&D programs • KRYSTEXXA shorter-infusion trial; designed to improve patient convenience TEPEZZA exploratory trial in diffuse cutaneous scleroderma Strongest position ever Peak U.S. annual net sales expectations for our key growth drivers KRYSTEXXA and TEPEZZA of >$1B each (2) • Strong capital structure; significantly reduced gross debt in 2019 with 0.7x net leverage; below target of 2.0x(3) • MIRROR OL: Open-label initial trial with 14 enrolled patients evaluating the use of KRYSTEXXA in combination with methotrexate to increase the response rate. MIRROR RCT: Registrational, randomized, placebo-controlled 135-patient trial evaluating the use of KRYSTEXXA in combination with methotrexate to increase the response rate. (1) MIRROR open-label response rate of 79 percent compared to Phase 3 blinded, placebo-controlled clinical trial data of 42 percent. (2) Horizon estimate. (3) Net leverage as of Dec. 31, 2019. HORIZON 5
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