European Commission Grants Marketing Authorization for Jyseleca® ? for the Treatment of Adults With Moderate to Severe Active Rheumatoid Arthritis

-- Jyseleca ^® Demonstrated Durable Efficacy Combined with a Consistent Safety Profile in Rheumatoid Arthritis Through 52 Weeks in Phase 3 Clinical Development Program --

Gilead Sciences, Inc. (Nasdaq: GILD) and Galapagos NV (Euronext & Nasdaq: GLPG) today announced that the European Commission (EC) has granted marketing authorization for Jyseleca ^® (filgotinib 200 mg and 100 mg tablets), a once-daily, oral, JAK1 inhibitor for the treatment of adults with moderate to severe active rheumatoid arthritis (RA) who have responded inadequately to, or are intolerant to, one or more disease modifying anti-rheumatic drugs (DMARDs). Jyseleca may be used as monotherapy or in combination with methotrexate (MTX). ¹

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RA is a chronic, progressive, systemic, inflammatory disease that can lead to significant and irreversible joint destruction, pain and functional impairment. ² Almost 3 million people in Europe are living with RA, ³ many of whom do not achieve long-term symptom control, which can lead to more frequent symptom flares and disease progression and can significantly impact their quality of life. ^4,5

"Despite the availability of existing therapies, new treatment options are still needed to help optimally manage the impact of RA on patients' daily lives. Jyseleca has demonstrated robust symptom control and prevention of disease progression with a consistent safety profile across the clinical development program. This marketing authorization provides a welcome new option for people in Europe living with this debilitating and complex disease," said Peter C. Taylor, MA, BM, BCh, PhD, FRCP, Professor of Musculoskeletal Sciences at the University of Oxford.

The EC's decision is supported by data from over 3,500 patients treated with Jyseleca across the Phase 3 FINCH and Phase 2 DARWIN programs. ⁶ In the FINCH studies, Jyseleca consistently achieved ACR20/50/70 criteria, with improvements in all individual ACR components compared with placebo or MTX. ^7-13

A significantly higher proportion of patients treated with Jyseleca 200 mg plus MTX or other conventional synthetic disease-modifying anti-rheumatic drug(s) (csDMARD) achieved low disease activity and/or remission (DAS28-CRP≤3.2 and DAS28-CRP 6-12

In patients who had an inadequate response to MTX, treatment with Jyseleca plus MTX achieved statistically significant inhibition of progression of structural joint damage compared to placebo plus MTX, as assessed using the modified Total Sharp Score (mTSS) at Week 24. In the DARWIN 3 Phase 2, open-label, long-term extension study, durable ACR20/50/70 responses were maintained for up to three years in patients who received Jyseleca 200 mg as monotherapy or with MTX. ¹

Across the FINCH and DARWIN trials, ¹⁴ the most common adverse reactions were nausea, upper respiratory tract infection, urinary tract infection and dizziness. ¹ Rates of herpes zoster and pneumonia were uncommon. ¹ The frequency of serious infections in the Jyseleca 200 mg group was 1.0% compared to 0.6% in the placebo group. ¹

In an integrated safety analysis in seven clinical trials the rates of major adverse cardiac events (MACE) and venous thromboembolism (VTE) with Jyseleca were comparable to placebo. ⁶ The rates of serious infections remained stable with long-term exposure. ¹

"Jyseleca, the first medicine from Galapagos to obtain regulatory approval is the result of a strong commitment to addressing unmet medical need," said Daniel O'Day, Chairman and Chief Executive Officer, Gilead Sciences. "We look forward to making continued progress through our collaboration with Galapagos so we can help to deliver many new solutions for patients in the future."

"Today's announcement is a proud day for everyone at Galapagos, recognizing years of research and commitment to make a meaningful change in the lives of patients struggling with the symptoms of RA," said Onno van de Stolpe, Chief Executive Officer, Galapagos. "This news further affirms the efficacy and safety profile of Jyseleca, and we look forward to bringing this important treatment to physicians and patients across Europe as quickly as possible."

About the FINCH Program

The FINCH Phase 3 program investigated the efficacy and safety of Jyseleca 200 mg and 100 mg once-daily, in RA patient populations ranging from early stage to biologic-experienced patients. FINCH 1 was a 52-week, randomized, placebo- and adalimumab-controlled trial in combination with MTX, enrolling 1,759 adult patients with moderate to severe active RA who had inadequate response to MTX. The primary endpoint in FINCH 1 was ACR20 at Week 12. The trial included radiographic assessment at Weeks 12, 24 and 52. FINCH 2 was a global, 24-week, randomized, double-blind, placebo-controlled, Phase 3 study evaluating Jyseleca on a background of csDMARDs among 449 adult patients with moderate to severe active RA who had not adequately responded to biologic DMARDs (bDMARDs). The primary endpoint in FINCH 2 was ACR20 at Week 12. FINCH 3 was a 52‑week, randomized trial in 1,252 MTX-naïve patients to evaluate Jyseleca 200 mg alone and Jyseleca 200 mg or 100 mg combined with MTX versus MTX alone in MTX-naïve patients. The primary endpoint in FINCH 3 was ACR20 at Week 24. The trial included radiographic assessment at Weeks 24 and 52.

About the Filgotinib Collaboration ¹⁵

Gilead and Galapagos NV are collaborative partners in the global development and commercialization of filgotinib in RA and other inflammatory indications. The companies are conducting global studies investigating the potential role of Jyseleca in a variety of diseases, including the previously reported Phase 3 SELECTION trial in ulcerative colitis.

Under the collaboration agreement, Galapagos will now receive a milestone payment of $75 million in recognition of the approval of Jyseleca by the European Commission.

More information about clinical trials with Jyseleca can be accessed at: www.clinicaltrials.gov .

About Gilead Sciences

Gilead Sciences, Inc. is a research-based biopharmaceutical company that discovers, develops and commercializes innovative medicines in areas of unmet medical need. The company strives to transform and simplify care for people with life-threatening illnesses around the world. Gilead has operations in more than 35 countries worldwide, with headquarters in Foster City, California. For more information on Gilead Sciences, please visit the company's website at www.gilead.com .

About Galapagos

Galapagos NV discovers and develops small molecule medicines with novel modes of action, three of which show promising patient results and are currently in late-stage development in multiple diseases. Our pipeline comprises discovery through Phase 3 programs in inflammation, fibrosis, osteoarthritis and other indications. Our ambition is to become a leading global biopharmaceutical company focused on the discovery, development and commercialization of innovative medicines. More information at www.glpg.com .

Gilead Forward-Looking Statement

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks, uncertainties and other factors. There is also the possibility of unfavorable results from ongoing and additional clinical trials involving filgotinib. Further, it is possible that the parties may make a strategic decision to discontinue development of filgotinib, and as a result, filgotinib may never be successfully commercialized. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. These risks, uncertainties and other factors could cause actual results to differ materially from those referred to in the forward-looking statements. The reader is cautioned not to rely on these forward-looking statements. These and other risks are described in detail in Gilead's Form 10-Q for the quarter ended June 30, 2020, as filed with the U.S. Securities and Exchange Commission. All forward-looking statements are based on information currently available to Gilead, and Gilead assumes no obligation to update any such forward-looking statements.

Galapagos Forward-Looking Statement

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, that are subject to risks, uncertainties and other factors that could cause actual results to differ materially from those referred to in the forward-looking statements and, therefore, the reader should not place undue reliance on them. These risks, uncertainties and other factors include, without limitation, the risk that ongoing and future clinical studies with filgotinib may not be completed in the currently envisaged timelines or at all, the inherent uncertainties associated with competitive developments, clinical trial and product development activities, regulatory approval requirements and the timing and outcome of interactions with regulatory authorities (including that data from the ongoing and planned clinical research programs may not support registration or further development of filgotinib due to safety, efficacy or other reasons), Galapagos' reliance on collaborations with third parties (including our collaboration partner for filgotinib, Gilead) and that Galapagos' estimations regarding its filgotinib development program and regarding the commercial potential of filgotinib may be incorrect, as well as those risks and uncertainties identified in our Annual Report on Form 20-F for the year ended 31 December 2019 and our subsequent filings with the SEC. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. The forward-looking statements contained herein are based on management's current expectations and beliefs and speak only as of the date hereof, and Galapagos makes no commitment to update or publicly release any revisions to forward-looking statements in order to reflect new information or subsequent events, circumstances or changes in expectations.

Full European Summary of Product Characteristics for Jyseleca are available from the EMA website at www.ema.europa.eu .

Jyseleca ^® , Gilead and the Gilead logo are trademarks of Gilead Sciences, Inc. or its related companies.

¹ Summary of Product Characteristics for Jyseleca ^® , Foster City, USA: Gilead Sciences.

² Centers for Disease Control and Prevention. Rheumatoid Arthritis (RA). Available at: https://www.cdc.gov/arthritis/basics/rheumatoid-arthritis.html . Accessed: September 2020.

³ National Rheumatoid Arthritis Society (NRAS). European Fit for Work report. Available at: https://www.nras.org.uk/european-fit-for-work-report . Accessed: September 2020.

⁴ Claxton, L. et al. An economic evaluation of tofacitinib treatment in rheumatoid arthritis after methotrexate or after 1 or 2 TNF inhibitors from a US payer perspective. Journal of Managed Care & Specialty Pharmacy. 2018;13:1-8. doi: 10.18553/jmcp.2018.17220.

⁵ Smolen, J.S. et al. EULAR recommendations for the management of rheumatoid arthritis with synthetic and biological disease-modifying antirheumatic drugs: 2016 update. Annals of Rheumatic Disease. 2017;79:685-699. doi: 10.1136/annrheumdis-2019-216655.

⁶ Genovese, M C et al. Integrated safety Analysis of Filgotinib Treatment for Rheumatoid Arthritis from 7 Clinical Trials. Abstract European Congress of Rheumatology (EULAR) 2020.

⁷ Kivitz, A. et al. Filgotinib provided rapid and sustained improvements in functional status, pain, health-related quality of life, and fatigue in patients with rheumatoid arthritis and inadequate response to methotrexate: results from the FINCH 1 study. Abstract European Congress of Rheumatology (EULAR) 2020.

⁸ Combe, B. et al. Efficacy and safety of Filgotinib for patients with rheumatoid arthritis with inadequate response to methotrexate: FINCH 1 52-week results. Abstract ACR/ARP Annual Meeting 2019.

⁹ Combe, B. et al. LB0001 efficacy and safety of Filgotinib for patients with rheumatoid arthritis with inadequate response to methotrexate: FINCH 1 primary outcome results. Annals of the Rheumatic Diseases. 2019;78:77-78.

¹⁰ Genovese, M. et al. Effect of Filgotinib vs placebo on clinical response in patients with moderate to severe rheumatoid arthritis refractory to disease-modifying antirheumatic drug therapy: the FINCH 2 randomized clinical trial [published correction appears in JAMA. 2020 Feb 4;323(5):480]. JAMA. 2019;322(4):315‐325. doi:10.1001/jama.2019.9055.

¹¹ Westhovens, R. et al. Efficacy and safety of Filgotinib in methotrexate-naïve patients with rheumatoid arthritis: FINCH 3 52-week results, Annals of the Rheumatic Diseases 2020;79:1019-1020.

¹² Alten, R. et al. Filgotinib provided rapid and sustained improvements in functional status, pain, and health related quality of life, and reduced fatigue over time in patients with rheumatoid arthritis who are methotrexate-naïve: results from the FINCH 3 study. Abstract European Congress of Rheumatology (EULAR) 2020.

¹³ Westhovens, R. et al. LB0003 efficacy and safety of Filgotinib for patients with rheumatoid arthritis naïve to methotrexate therapy: FINCH 3 primary outcome results. Annals of the Rheumatic Diseases. 2019;78:259-261.

¹⁴ Frequency based on placebo controlled pre rescue period (week 12) pooled across FINCH 1 and 2, and DARWIN 1 and 2, for patients who received Filgotinib 200 mg. Summary of Product Characteristics for Jyseleca ^® (table 2). Foster City, USA: Gilead Sciences.

¹⁵ Gilead & Galapagos Filgotinib Clinical Program Trial Details: FINCH 1 ( NCT02889796 ); FINCH 2 ( NCT02873936 ); FINCH 3 ( NCT02886728 ); SELECTION ( NCT02914522 ); DIVERSITY ( NCT02914561 ); PENGUIN 1 ( NCT04115748 ); PENGUIN 2 ( NCT04115839 ).

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