IO Biotech Announces 2023 Third Quarter Results

• Completed enrollment of 380 patients in pivotal Phase 3 trial of lead therapeutic cancer vaccine, IO102-IO103 in combination with KEYTRUDA® (pembrolizumab), in patients with advanced melanoma
• Presented encouraging preliminary data from Phase 2 basket trial of IO102-IO103 at the IASLC 2023 World Conference on Lung Cancer (WCLC) in September 2023 and at the European Society of Medical Oncology (ESMO) annual meeting in October 2023
• Presented three posters at the Society for Immunotherapy of Cancer’s (SITC) 38th Annual Meeting; non-clinical data presented demonstrates clear impact of immune modulating vaccines targeting IDO1 and PD-L1 on several tumoral immune escape mechanisms in the tumor microenvironment leading to enhanced anti-tumor effect
• Ended the third quarter with approximately $165.5 million in cash and cash equivalents, including proceeds from recently completed $75 million private placement; cash position is expected to support operations into the fourth quarter of 2025

New York, NY – November 13, 2023: IO Biotech (Nasdaq: IOBT), a clinical-stage biopharmaceutical company developing novel, immune-modulating therapeutic cancer vaccines based on its T-win® technology platform, today reported financial results for the third quarter ended September 30, 2023.

“Our focus for 2023 has been to successfully execute multiple clinical trials for our novel, investigational therapeutic cancer vaccine, IO102-IO103. We recently achieved several milestones, completion of enrollment in our pivotal Phase 3 trial in patients with advanced melanoma, the presentation of encouraging preliminary data from the Phase 2 basket trial of IO102-IO103 at WCLC and ESMO, and expanding into earlier stages of melanoma treatment with the initiation of an additional Phase 2 basket study in the neoadjuvant/adjuvant setting,” said Mai-Britt Zocca, PhD, President and CEO of IO Biotech. “With our strengthened balance sheet as a result of our $75 million private placement and key additions to both our management team and board of directors, we are in a strong position as we work diligently to bring our lead therapeutic cancer vaccine candidate, IO102-IO103, toward the market, potentially as early as 2025.”

Recent Business Highlights and Anticipated Milestones

• The company completed enrollment of 380 patients in its pivotal Phase 3 trial (IOB-013/KN-D18) in November 2023. The primary endpoint of the pivotal Phase 3 trial is progression free survival (PFS). The PFS analysis is event-driven and will be conducted when 226 events have occurred in the trial, which the company estimates will take place in the second half of 2025. Additionally, there is a per-protocol interim analysis of overall response rate (ORR) planned when the first 225 randomized patients reach one year of treatment in June 2024. The outcome of this analysis is expected in the third quarter of 2024.

• The Phase 2 basket trial (IOB-022/KN-D38) evaluating IO102-IO103 in combination with pembrolizumab in patients with metastatic non-small cell lung cancer, or recurrent or metastatic squamous cell cancer of the head and neck (SCCHN) also continued to enroll patients. Encouraging preliminary data from this basket trial were presented at the IASLC 2023 World Conference on Lung Cancer (WCLC) in September 2023 and at the ESMO Congress in October 2023.  [https://bit.ly/3uhelje; https://bit.ly/3MxPWwg]
• The company presented three posters at the Society for Immunotherapy of Cancer’s (SITC) 38th Annual Meeting. Non-clinical data presented demonstrate the clear impact of therapeutic vaccines targeting IDO1 and PD-L1 on several tumoral immune escape mechanisms in the tumor microenvironment leading to enhanced anti-tumor effect and support the clinical observations observed to date with the company’s lead therapeutic vaccine candidate, IO102-IO103. [https://bit.ly/469Lvyy]

• On August 7, 2023, the company completed a $75 million private placement with participation from both new and existing healthcare-dedicated investors, extending the company’s cash runway into the fourth quarter of 2025. [https://bit.ly/3QSyaXl]
• The company appointed a new member, Helen Collins, MD, to the company’s board of directors. Dr. Collins is currently the Chief Medical Officer at Enliven Therapeutics. Prior to joining Enliven, Helen served as Chief Medical Officer and Executive Vice President at Five Prime Therapeutics, a clinical-stage biotechnology company focused on oncology that was acquired by Amgen, Inc. She serves as a member of the board of directors of Kura Oncology. [Link to Press Release]

Third Quarter 2023 Financial Results

The company ended the third quarter with approximately $165.5 million in cash and cash equivalents, which is expected to fund the company’s operations into the fourth quarter of 2025.

• Net loss for the three months ended September 30, 2023, was $21.7 million, compared to $15.7 million for the three months ended September 30, 2022.

• Research and development expenses were $17.7 million for the three months ended September 30, 2023, compared to $10.0 million for the three months ended September 30, 2022. The increase was primarily related to clinical trial-related activities for our IO102-IO103 therapeutic vaccine candidate, including the continued execution of our Phase 3 clinical trial. The company recognized $2.1 million in research and development equity-based compensation for the three months ended September 30, 2023, compared to $1.0 million for the three months ended September 30, 2022.
• General and administrative expenses were consistent at $5.8 million for the three months ended September 30, 2023 and 2022, respectively. The company recognized $0.9 million in general and administrative equity-based compensation for the three months ended September 30, 2023, compared to $1.4 million for the three months ended September 30, 2022.
• Cash and cash equivalents as of September 30, 2023, were $165.5 million, compared to $142.6 million at December 31, 2022. During the three months ended September 30, 2023, the company used cash, cash equivalents and restricted cash of $16.0 million from operating and investing activities, obtained $71.9 million in estimated net cash proceeds from our private placement and incurred an additional decrease of $0.5 million in cash due to the effects of foreign currency exchange rates.

Upcoming Events

Jefferies London Healthcare Conference from November 14-16, 2023 in London. Mai-Britt Zocca, PhD, President and CEO, and Amy Sullivan, CFO, will participate in one-on-one meetings on Wednesday, November 15.

Piper Sandler 35^th Annual Healthcare Conference from November 28-30, 2023 in New York. Dr. Zocca will present a corporate overview and Dr. Zocca and Ms. Sullivan will participate in one-on-one meetings on Wednesday, November 29.

About IO102-IO103

IO102-IO103 is an investigational immune-modulating therapeutic cancer vaccine designed to target the immunosuppressive mechanisms mediated by the proteins indoleamine 2,3-dioxygenase (IDO) and programmed death-ligand 1 (PD-L1). The company is currently conducting a pivotal Phase 3 trial (IOB-013/KN-D18; NCT05155254) evaluating IO102-IO103 in combination with pembrolizumab in first-line advanced melanoma patients, a Phase 2 basket trial (IOB-022/KN-D38; NCT05077709) evaluating IO102-IO103 in combination with pembrolizumab in first-line advanced non-small cell lung cancer and squamous cell cancer of the head and neck (SCCHN), and a Phase 2 basket trial (IOB-032/PN-E40; NCT05280314) evaluating IO102-IO103 plus pembrolizumab as a perioperative treatment in solid tumors including melanoma and SCCHN.

The clinical trials are sponsored by IO Biotech and conducted in collaboration with Merck and Merck is supplying pembrolizumab. IO Biotech maintains global commercial rights to IO102-IO103.

KEYTRUDA® is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA.

About IO Biotech

IO Biotech is a clinical-stage biopharmaceutical company developing novel, immune-modulating therapeutic cancer vaccines based on its T-win® vaccine platform. The T-win platform is a novel approach to cancer vaccines designed to activate T cells to target the immunosuppressive cells in the tumor microenvironment. IO Biotech is advancing its lead cancer vaccine candidate, IO102-IO103, in clinical trials, and additional pipeline candidates through preclinical development. Based on positive Phase 1/2 first line advanced melanoma data, IO102-IO103, in combination with pembrolizumab, has been granted a breakthrough therapy designation for the treatment of unresectable / metastatic melanoma by the US Food and Drug Administration. IO Biotech is headquartered in Copenhagen, Denmark and has US headquarters in New York, New York.

For further information, please visit www.iobiotech.com.