• Encouraging clinical activity with observed deepening of responses in 35 evaluable first line head and neck patients treated with HB-200 plus pembrolizumab
• In a subset of 17 evaluable patients with PD-L1 combined positive score (CPS) of 20 or higher, the Company’s selected registrational pivotal trial population, data showed confirmed ORR of 53%, CR rate of 18%, and DCR of 82%
• Preliminary progression-free survival (PFS) was 16.3 months and preliminary overall survival (OS) rate was 88% at 9 months for the CPS 20 or higher subgroup, comparing favorably to current standard of care
• Company will host a conference call at 4:15 p.m. ET today

NEW YORK and VIENNA, June 04, 2024 (GLOBE NEWSWIRE) — HOOKIPA Pharma Inc. (NASDAQ: HOOK, ‘HOOKIPA’), a company developing a new class of immunotherapeutics based on its proprietary arenavirus platform, today announced positive updated results from its Phase 2 clinical trial of HB-200 in combination with pembrolizumab in patients with recurrent/metastatic human papillomavirus 16 positive (HPV16+) head and neck cancer.

The updated data presented at the ASCO 2024 Annual Meeting is as of March 29, 2024 (cutoff date) and includes 46 patients treated with HB-200 plus pembrolizumab in the first line setting. Results showed rapid and durable activation of antigen-specific CD8+ T cells and promising clinical activity.

Among 35 evaluable patients data showed a 37 percent confirmed objective response rate (ORR), 11 percent complete response (CR) rate, and 69% disease control rate (DCR), per RECIST 1.1 criteria. Duration of response was not yet mature with 62 percent of responders still on treatment as of the cutoff date.

In a subset of 17 evaluable patients with CPS of 20 or higher, the updated data showed a 53 percent confirmed ORR, 18 percent CR rate, and 82 percent DCR. These patients are representative of the Company’s planned pivotal Phase 2/3 trial population, which is targeted to begin enrolling patients in the fourth quarter of 2024.

Additionally, preliminary PFS for the CPS 20 or higher subgroup was 16.3 months and is encouraging based on the historical PFS data of 3.4 months reported for pembrolizumab alone¹. The preliminary OS rate was 88% at 9 months, and median OS was unreached as of the cutoff date with 16 of 19 patients still alive. Median follow-up for these patients was 8.4 months.

“Based on the evidence from the Phase 2 trial of HB-200 plus pembrolizumab, I am encouraged by the potential this immunotherapy combination may provide as a targeted therapeutic option for HPV16+ head and neck cancer patients,” said Dr. Alan Ho, Head and Neck Oncologist at Memorial Sloan Kettering Cancer Center and a trial investigator. “The data show that this combination has been generally well-tolerated and can likely increase immunogenic tumor cell death, leading to improved response rates and potential durability.”

“HPV16+ disease is a unique indication that requires a patient-centric and targeted therapeutic approach. HB-200 plus pembrolizumab has shown to be a potentially powerful combination that has consistently delivered positive outcomes for our patients,” said Joern Aldag, Chief Executive Officer of HOOKIPA. “Among published data in HPV+ disease, HOOKIPA has a best-in-class asset with the HB-200 combination. We also have alignment on a clinical development strategy with the U.S. Food and Drug Administration with a path to potential accelerated approval. Importantly, our pivotal seamless Phase 2/3 trial is just the beginning—our platform continues to demonstrate the potential power of arenaviral-based immunotherapies to help provide targeted treatments for patients across disease areas and indications.”

Call Details:
HOOKIPA HB-200 ASCO Data Update
Tuesday, June 4, 2024, 4:15 p.m. ET
Webcast Registration
Dial-in Registration

Results:
HB-200 in combination with pembrolizumab:
Data were presented as of March 29, 2024, and included 46 first line patients with HPV16+, PD-L1 positive, recurrent or metastatic head and neck squamous cell carcinoma. The updated data continue to demonstrate a favorable safety profile of HB-200 in combination with pembrolizumab and promising clinical activity as a first line treatment.

HB-200 + pembrolizumab was generally well tolerated. Grade ≥3 treatment-related adverse events (TRAEs) were reported in 7 (15%) patients, serious TRAEs in 2 (4%) patients, and TRAEs leading to treatment discontinuation of HB-200 in 2 (4%) patients. No treatment-related deaths were reported.

Among 35 evaluable patients, 4 confirmed complete responses, 9 confirmed partial responses, and 11 confirmed stable disease were observed. Notably, among patients with PD-L1 CPS ≥20 (N=17), ORR was 53% (9/17), complete response rate was 18% (3/17), and DCR was 82% (14/17). All responses were confirmed per RECIST 1.1. Preliminary PFS for the CPS 20 or higher subgroup was 16.3 months. The preliminary OS rate was 88% at 9 months, and median OS was unreached as of the cutoff date with 16 of 19 patients still alive. Median follow-up for these patients was 8.4 months.

Abstract details: ASCO 2024 Annual Meeting
Title: HB-200 arenavirus-based immunotherapy plus pembrolizumab as first-line treatment of patients with recurrent/metastatic HPV16-positive head and neck cancer: Updated results
Presenter: Dr. Alan L. Ho, Head and Neck Oncologist at Memorial Sloan Kettering Cancer Center and a trial investigator
Abstract Type: Oral abstract
Session Name: Head and Neck Cancer
Session Date and Time: June 4, 2024; 9:45 AM-12:45 PM CDT
Abstract Number: 6005

About HB-200
HB-200 is HOOKIPA’s lead oncology candidate engineered with the company’s proprietary replicating arenaviral vector platform. It comprises two single-vector compounds with arenaviral backbones based on lymphocytic choriomeningitis virus (LCMV) and pichinde virus (PICV). Both express the same transgene encoding an E7E6 fusion protein derived from HPV16. HB-200 is an alternating 2-vector immunotherapy designed to further focus the immune response against the encoded antigen.

HB-200 in combination with pembrolizumab received Fast Track Designation from the U.S. Food and Drug Administration and PRIME designation from the European Medicines Agency for the treatment of first-line HPV16+ recurrent/metastatic oropharyngeal squamous cell carcinoma. These designations are supported by preliminary clinical evidence from the Phase 1/2, open-label, clinical trial (NCT04180215) evaluating safety, T cell response, and efficacy based on objective response rate (ORR) and disease control rate (DCR) as defined by RECIST 1.1.

¹ Harrington et al. Pembrolizumab With or Without Chemotherapy in Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma: Updated Results of the Phase III KEYNOTE-048 Study. Journal of Clinical Oncology. 2023;41(4);790-802.

About HOOKIPA
HOOKIPA Pharma Inc. (NASDAQ: HOOK) is a clinical-stage biopharmaceutical company focused on developing novel immunotherapies, based on its proprietary arenavirus platform, which are designed to mobilize and amplify targeted T cells and thereby fight or prevent serious disease. HOOKIPA’s replicating and non-replicating technologies are engineered to induce robust and durable antigen-specific CD8+ T cell responses and pathogen-neutralizing antibodies. HOOKIPA’s pipeline includes its wholly owned investigational arenaviral immunotherapies targeting Human Papillomavirus 16-positive cancers, KRAS-mutated cancers, and other undisclosed programs. In addition, HOOKIPA aims to develop functional cures of HBV and HIV in collaboration with Gilead. 

Find out more about HOOKIPA online at www.hookipapharma.com.

Forward Looking Statements
Certain statements set forth in this press release constitute “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements can be identified by terms such as “anticipates”, “believes,” “expects,” “plans,” “potential,” “target,” “will,” “would” or similar expressions and the negative of those terms. Forward-looking statements in this press release include HOOKIPA’s statements regarding the potential of its product candidates to positively impact quality of life and alter the course of disease in the patients it seeks to treat, HOOKIPA’s plans, strategies, expectations and anticipated milestones for its preclinical and clinical programs, including the timing of initiating clinical trials and patient enrollment and the composition of patient populations for clinical trials, the availability and timing of results from preclinical studies and clinical trials, the timing of regulatory filings, the expected safety profile of HOOKIPA’s product candidates, and the probability of successfully developing and receiving regulatory approval for its product candidates, including accelerated approval for HB-200. Such forward-looking statements involve substantial risks and uncertainties that could cause HOOKIPA’s research and clinical development programs, future results, performance or achievements to differ significantly from those expressed or implied by the forward-looking statements. Such risks and uncertainties include, among others, the uncertainties inherent in the drug development process, including HOOKIPA’s programs’ early stage of development, the process of designing and conducting preclinical and clinical trials, plans and timelines for the preclinical and clinical development of its product candidates, including the therapeutic potential, clinical benefits and safety thereof, the timing, success and data announcements of current ongoing preclinical and clinical trials, the ability to initiate new clinical programs, the risk that the results of current preclinical studies and clinical trials may not be predictive of future results in connection with current or future preclinical and clinical trials, including those for HB-200, HB-700, HB-400 and HB-500, the regulatory approval processes, the timing of regulatory filings, the challenges associated with manufacturing drug products, HOOKIPA’s ability to successfully establish, protect and defend its intellectual property, HOOKIPA’s ability to achieve the expected benefits of its strategic reprioritization and other matters that could affect the sufficiency of existing cash to fund operations. HOOKIPA undertakes no obligation to update or revise any forward-looking statements. For a further description of the risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to the business of the Company in general, see HOOKIPA’s Annual Report on Form 10-K for the year ended December 31, 2023, as well as discussions of potential risks, uncertainties, and other important factors in HOOKIPA’s subsequent filings with the Securities and Exchange Commission, which are available on the SEC’s website at https://sec.gov and HOOKIPA’s website at www.hookipapharma.com. Except as specifically noted otherwise, all information in this press release is as of the date of the release, and HOOKIPA undertakes no duty to update this information unless required by law.

Availability of Other Information About HOOKIPA
Investors and others should note that we announce material financial information to our investors using our investor relations website, www.ir.hookipapharma.com, SEC filings, press releases, public conference calls and webcasts. We use these channels, as well as social media, to communicate with our investors and the public about our company, our services and other issues. It is possible that the information we post on social media could be deemed to be material information. Therefore, we encourage investors, the media, and others interested in our company to review the information we post on the social media channels listed on our investor relations website.

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