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FibroGen Reports Second Quarter 2018 Financial Results

August 7, 2018

Roxadustat U.S. Phase 3 Topline Clinical Data Readout on Track for Fourth Quarter of 2018

Feedback from FDA on Pamrevlumab Pivotal Programs in IPF and in Locally Advanced Unresectable Pancreatic Cancer

Conference Call Today at 5:00 p.m. Eastern Time/2:00 p.m. Pacific Time

SAN FRANCISCO, Aug. 07, 2018 (GLOBE NEWSWIRE) -- FibroGen, Inc. (NASDAQ: FGEN), a biopharmaceutical company, today reported financial results for the second quarter of 2018 and provided an update on the company’s recent developments.

“We are encouraged by the progress of our discussions with the FDA in advancing the development of pamrevlumab in IPF and locally advanced pancreatic cancer into pivotal Phase 3 clinical trials, including with the potential for accelerated approval in LAPC,” said Thomas B. Neff, FibroGen’s Chief Executive Officer. “Meanwhile, we are on track with timelines for regulatory submission of roxadustat for the treatment of CKD anemia in multiple regions, as we have made significant progress toward approval in China, and our studies for U.S. approval are completing and will read out in the fourth quarter of this year.”

Recent Developments and HighlightsRoxadustat for Anemia in Chronic Kidney Disease (CKD) in the U.S./EU

-- U.S. Phase 3 trial enrollment completed -- Topline Phase 3 clinical data readout on target for the fourth quarter of 2018 -- Pooled MACE safety data anticipated in early 2019 -- New Drug Application (NDA) submission to the U.S. Food and Drug Administration (FDA) on target for the first half of 2019 -- In its most recent and final review, the data safety monitoring board recommended Phase 3 clinical studies continue under current protocols with no changes

Roxadustat for Anemia in CKD in China

-- NDA approval decision by the State Drug Administration (SDA) anticipated by year-end 2018

Roxadustat for Anemia Associated with MDS in China

-- Patient dosing underway in Phase 2/3 study

Roxadustat for Anemia in CKD in Japan

-- Astellas and FibroGen announced positive topline results from double-blind Phase 3 study in hemodialysis CKD patients in May 2018 -- Astellas plans to submit NDA for anemia associated with dialysis-dependent CKD in 2018 -- Astellas expects to announce topline data readout from the first of two ongoing non-dialysis-dependent CKD Phase 3 studies in the fourth quarter of 2018

Pamrevlumab for Idiopathic Pulmonary Fibrosis (IPF)

-- Positive Phase 2b efficacy and safety results (improvements in lung function (FVC), quantitative measure of fibrosis (HRCT) and quality of life (SGRQ)) reported in multiple poster presentations at the 2018 American Thoracic Society (ATS) Conference in May 2018 -- Met with the FDA on IPF Phase 3 design; Phase 3 study planned to begin in early 2019

Pamrevlumab for Pancreatic Cancer

-- Positive Phase 1/2 clinical results showing higher rates of eligibility for surgical resection and tumor resection rates in patients treated with roxadustat, presented at the 2018 American Society of Clinical Oncology (ASCO) Annual Meeting in June 2018 -- Agreement with the FDA on pivotal trial design with approximately 260 patients; trial planned to begin in early 2019

Corporate and Financial

-- Net loss for the second quarter was $23.4 million, or ($0.28) per share, compared to $31.9 million, or ($0.46) per share, primarily due to recognition of a milestone payment for an upcoming Japan NDA submission -- At June 30, 2018, FibroGen had $733.7 million of cash, cash equivalents, investments, restricted time deposits, and receivables -- The weighted average number of common shares used to calculate net loss per share was 83.8 million shares and 69.6 million shares for the second quarters of 2018 and 2017, respectively. Total shares outstanding as of June 30, 2018 were 84.2 million shares

Conference Call and Webcast Details FibroGen will host a conference call and webcast today, Tuesday, August, 7, 2018, at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time) to discuss financial results and provide a business update. A live audio webcast of the call may be accessed in the investor section of the company’s website, www.fibrogen.com. To participate in the conference call by telephone, please dial 1 (888) 771-4371 (U.S. and Canada) or 1 (847) 585-4405 (international), reference the FibroGen second quarter 2018 financial results conference call, and use passcode 47339190#. A replay of the webcast will be available shortly after the call for a period of two weeks. To access the replay, please dial 1 (888) 843-7419 (domestic) or 1 (630) 652-3042 (international), and use passcode 47339190#.

About Roxadustat Roxadustat (FG-4592) is a first-in-class, orally administered small molecule currently in global Phase 3 clinical development as a potential therapy for anemia associated with chronic kidney disease (CKD). Roxadustat is a hypoxia-inducible factor prolyl hydroxylase inhibitor (HIF-PHI) that promotes erythropoiesis through increasing endogenous erythropoietin, improving iron regulation, and reducing hepcidin. Administration of roxadustat has been shown to induce coordinated erythropoiesis – increasing red blood cell count while maintaining plasma erythropoietin levels within or near normal physiologic range in multiple subpopulations of CKD patients, including in the presence of inflammation and without a need for supplemental intravenous iron.

Astellas and FibroGen are collaborating on the development and commercialization of roxadustat for the treatment of anemia in patients with CKD in territories including Japan, Europe, the Commonwealth of Independent States, the Middle East, and South Africa. AstraZeneca and FibroGen are collaborating on the development and commercialization of roxadustat for the treatment of anemia in patients with CKD in the U.S., China, and other markets.

Roxadustat is advancing through Phase 3 clinical trials worldwide, with multiple trials completed. The Phase 3 program is supported by extensive Phase 2 clinical data demonstrating correction and maintenance of hemoglobin levels in multiple subpopulations of CKD anemia patients. Globally, the Phase 3 program encompasses a total of 15 Phase 3 studies to support independent regulatory approvals of roxadustat in both non-dialysis-dependent and dialysis-dependent CKD patients in the U.S., Europe, Japan, and China. Roxadustat is currently in Phase 3 clinical development for the treatment of anemia associated with myelodysplastic syndromes (MDS) in the U.S. and in Phase 2/3 development for MDS in China.

About Pamrevlumab Pamrevlumab is a first-in-class antibody developed by FibroGen to inhibit the activity of connective tissue growth factor (CTGF), a common factor in fibrotic and proliferative disorders characterized by persistent and excessive scarring that can lead to organ dysfunction and failure. Pamrevlumab is advancing towards Phase 3 clinical development for the treatment of idiopathic pulmonary fibrosis (IPF) and pancreatic cancer and has been granted Orphan Drug Designation (ODD) in each of these indications, and is currently in a Phase 2 trial for Duchenne muscular dystrophy (DMD). Pamrevlumab has received Fast Track designation from the U.S. Food and Drug Administration for the treatment of patients with locally advanced unresectable pancreatic cancer. Across all trials, pamrevlumab has consistently demonstrated a good safety and tolerability profile to date. For information about pamrevlumab studies currently recruiting patients, please visit www.clinicaltrials.gov.

About FibroGen FibroGen, Inc., headquartered in San Francisco, with subsidiary offices in Beijing and Shanghai, is a leading biopharmaceutical company discovering and developing a pipeline of first-in-class therapeutics. The company applies its pioneering expertise in hypoxia-inducible factor (HIF), connective tissue growth factor (CTGF) biology, and clinical development to advance innovative medicines for the treatment of anemia, fibrotic disease, and cancer. Roxadustat, the company’s most advanced product candidate, is an oral small molecule inhibitor of HIF prolyl hydroxylase activity, completing worldwide Phase 3 clinical development for the treatment of anemia in chronic kidney disease (CKD), with a New Drug Application (NDA) currently under review in China by the State Drug Administration (SDA). Roxadustat is in Phase 3 clinical development in the U.S. and Europe and in Phase 2/3 development in China for anemia associated with myelodysplastic syndromes (MDS). Pamrevlumab, an anti-CTGF human monoclonal antibody, is advancing towards Phase 3 clinical development for the treatment of idiopathic pulmonary fibrosis (IPF) and pancreatic cancer, and is currently in a Phase 2 trial for Duchenne muscular dystrophy (DMD). FibroGen is also developing a biosynthetic cornea in China. For more information, please visit www.fibrogen.com.

Forward-Looking Statements This release contains forward-looking statements regarding our strategy, future plans and prospects, including statements regarding the development of the company’s product candidates pamrevlumab and roxadustat, the potential safety and efficacy profile of our product candidates, and our clinical, regulatory, and commercial plans, and those of our partners. These forward-looking statements include, but are not limited to, statements about our plans, objectives, representations and contentions and are not historical facts and typically are identified by use of terms such as “may,” “will”, “should,” “on track,” “could,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” “continue” and similar words, although some forward-looking statements are expressed differently. Our actual results may differ materially from those indicated in these forward-looking statements due to risks and uncertainties related to the continued progress and timing of our various programs, including the enrollment and results from ongoing and potential future clinical trials, and other matters that are described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017, and our Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2018 filed with the Securities and Exchange Commission (SEC), including the risk factors set forth therein. Investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release, and we undertake no obligation to update any forward-looking statement in this press release, except as required by law.

Condensed Consolidated Balance Sheets(In thousands)

June 30, December 2018 31, 2017 (1) --------- --------- (Unaudited) Assets Current assets: Cash and cash equivalents $ 643,803 $ 673,658 Short-term investments 28,094 62,060 Accounts receivable 30,189 8,452 Prepaid expenses and other current assets 17,997 4,800 - ------- - ------- Total current assets 720,083 748,970 Restricted time deposits 5,181 5,181 Long-term investments 10,587 10,506 Property and equipment, net 128,829 129,476 Other assets 5,239 4,517 - ------- - ------- Total assets $ 869,919 $ 898,650 - ------- - ------- Liabilities, stockholders’ equity and non-controlling interests Current liabilities: Accounts payable $ 3,222 $ 5,509 Accrued liabilities 49,492 63,781 Deferred revenue 37,845 16,670 - ------- - ------- Total current liabilities 90,559 85,960 Long-term portion of lease financing obligations 97,473 97,763 Product development obligations 16,981 17,244 Deferred rent 3,350 3,657 Deferred revenue, net of current 137,436 138,241 Other long-term liabilities 9,318 8,047 - ------- - ------- Total liabilities 355,117 350,912 Total stockholders’ equity 495,531 528,467 Non-controlling interests 19,271 19,271 - ------- - ------- Total equity 514,802 547,738 - ------- - ------- Total liabilities, stockholders’ equity and non-controlling interests $ 869,919 $ 898,650 - ------- - -------

(1) The condensed consolidated balance sheet amounts at December 31, 2017 are recast from audited financial statements to reflect the adoption of the new revenue standards as of January 1, 2018.

Condensed Consolidated Statements of Operations(In thousands, except per share data)

Three Months Ended Six Months Ended June June 30, 30, ---------------------- ------------------------ 2018 2017 (1) 2018 2017 (1) --------- --------- --------- ----------- (Unaudited) (Unaudited (1) ) Revenue: License revenue $ 14,323 $ — $ 14,323 $ - Development and other revenue 29,629 30,268 61,553 59,710 - ------- - ------- - ------- - ------- Total revenue 43,952 30,268 75,876 59,710 Operating expenses: Research and development 52,138 46,981 109,112 93,713 General and administrative 15,055 13,425 30,605 24,955 - ------- - ------- - ------- - ------- Total operating expenses 67,193 60,406 139,717 118,668 - ------- - ------- - ------- - ------- Loss from operations (23,241 ) (30,138 ) (63,841 ) (58,958 ) Interest and other, net: Interest expense (2,750 ) (2,757 ) (5,519 ) (5,132 ) Interest income and other, net 2,646 1,031 4,717 1,677 - ------- - ------- - ------- - ------- Total interest and other, net (104 ) (1,726 ) (802 ) (3,455 ) - ------- - ------- - ------- - ------- Loss before income taxes (23,345 ) (31,864 ) (64,643 ) (62,413 ) Provision for income taxes 75 48 174 109 - ------- - ------- - ------- - ------- Net loss $ (23,420 ) (31,912 ) $ (64,817 ) $ (62,522 ) - ------- - ------- - ------- - ------- Net loss per share - basic and diluted $ (0.28 ) $ (0.46 ) $ (0.78 ) $ (0.94 ) Weighted average number of common shares used to calculate 83,750 69,638 83,309 66,853 net loss per share - basic and diluted

(1) The condensed consolidated statements of operations amounts for the three and six months ended June 30, 2017 are recast from unaudited financial statements to reflect the adoption of the new revenue standards as of January 1, 2018.

ContactFibroGen, Inc.Karen L. BergmanVice President, Investor Relations and Corporate Communications1 (415) 978-1433 kbergman@fibrogen.com

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