Exhibit 99.1

Alpine Immune Sciences Provides Pipeline Update and
Reports Second Quarter 2019 Financial Results
ALPN-101 Progresses to Multiple-Ascending Dose Cohorts of Phase I Study
ALPN-202 Submission for Clinical Trial Authorization Anticipated by Year End 2019
SEATTLE, WA - August 13, 2019 - Alpine Immune Sciences, Inc. (NASDAQ:ALPN), a leading clinical-stage immunotherapy company focused on developing innovative treatments for cancer, autoimmune/inflammatory, and other diseases, today provided a corporate update and reported financial results for the second quarter ended June 30, 2019.
“I am proud of the progress Alpine has made in the first six months of the year and the momentum we’ve built heading into a potentially transformative year ahead,” said Mitchell H. Gold, MD, Executive Chairman and Chief Executive Officer of Alpine. “The Phase I trial of ALPN-101 in healthy volunteers has advanced through the single-ascending dose cohorts, enabling initiation of the multiple-ascending dose cohorts. This is an important milestone for our first-in-class dual ICOS/CD28 blocker which we believe has the potential to deliver meaningful remissions in inflammatory diseases. We expect to have completed the critical portions of the Phase 1 trial of ALPN-101 by the end of 2019 and look forward to initiating our studies in acute GVHD and Psoriatic Arthritis.”
Recent Pipeline and Company Highlights
ALPN-101 Update:
Phase I Trial Successfully Progresses Through the Single-Ascending Dose (SAD) Cohorts: Dosing of all planned SAD cohorts in the Phase I healthy volunteer study has been successfully completed. Enrollment has begun on the multiple-ascending dose cohorts.
“The safety, pharmacokinetic and pharmacodynamic data so far have been encouraging and we believe this study, once complete, will allow us to select an appropriate dose(s) for Phase II studies,” said Stanford Peng, MD, PhD, Alpine’s President and Head of Research and Development. “We expect to have these data before the end of the year and hope to present the data publicly in the first half of 2020.”
Trials in patients with GVHD and Psoriatic Arthritis are on track to begin following completion of the Phase I healthy volunteer study.
Alpine plans to present additional preclinical data supporting the potential role of ALPN-101 in additional indications at an upcoming scientific conference in the fourth quarter of 2019, supporting the potential broad utility of ALPN-101.
ALPN-202 Update:
Alpine anticipates submitting for regulatory authorization to begin clinical trials by the end of 2019. Alpine believes ALPN-202 will be the first clinical trial of a conditional T-cell agonist targeting CD28 while also providing checkpoint blockade.
Alpine expects to present new mechanistic data in the fourth quarter of 2019 supporting the unique mechanism of action of ALPN-202.
Corporate Update:
Initiated New Collaboration with Adaptimmune: Alpine entered into a collaboration and license agreement with Adaptimmune Therapeutics (NASDAQ:ADAP) in May 2019. The new partnership aims to utilize Alpine’s secreted

The following information was filed by Alpine Immune Sciences, Inc. (ALPN) on Tuesday, August 13, 2019 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-Q Quarterly Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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