Data from Phase 1/2a study of RM-1929 Photoimmunotherapy in Patients with Recurrent Head and Neck Squamous Cell Carcinoma was Published in Head and Neck

SAN MATEO, Calif., Oct. 27, 2021 /PRNewswire/ -- Rakuten Medical, Inc. (Rakuten Medical) announced that data from a phase 1/2a, open-label, multicenter study of RM-1929 photoimmunotherapy in patients with locoregional, recurrent head and neck squamous cell carcinoma (rHNSCC) (RM-1929-101 study, ClinicalTrials.gov Identifier: NCT02422979) was accepted for publication in Head and Neck and published online on October 9^th, 2021.

The manuscript describes the design and results of the 2-part study, which was aimed to elucidate the recommended dose, safety, pharmacokinetics, immunogenicity, and preliminary efficacy of RM-1929 photoimmunotherapy in patients with locoregional rHNSCC.  Part 1* of the study (dose-escalation) determined the recommended drug dose of RM-1929 to be 640 mg/m² with a fixed light dose of 50 J/cm² for superficial tumors and 100 J/cm fiber diffuser length for interstitial tumors.

Among Part 2* participants, 30 patients received RM-1929 photoimmunotherapy, and were included in the safety and treated population. Among Part 2* study participants, 13 (43.3%) patients reported a serious TEAE wherein 3 were considered to be treatment related (tumor pain, oral pain, and airway obstruction).  Also, for patients enrolled in Part 2* of the study, the median OS was 9.30 months (95% CI 5.16–16.92 months).  Confirmed and unconfirmed objective responses were achieved in 13 (43.3%, 95% CI 25.46%–62.57%) patients, with 4 (13%) patients achieving a complete response (CR) and 9 (30.0%) patients demonstrating a partial response (PR).  Disease control [defined as CR, PR, or stable disease (SD)] was observed in 24 (80%, 95% CI 61.43%–92.29%) patients.

The full text article is available at https://onlinelibrary.wiley.com/doi/full/10.1002/hed.26885

*Part 1: Phase 1 study part (safety and dose-finding) / Part 2: Phase 2a study part (safety and preliminary anticancer activity; patients were treated with up to 4 cycles of RM-1929 photoimmunotherapy)

**RM-1929 and ASP-1929 are analogous. Extensive physiochemical studies show that they have comparable physical and chemical properties.

About Rakuten Medical, Inc. 

Rakuten Medical, Inc. is a global biotechnology company developing and commercializing precision, cell-targeting investigational therapies on its Illuminox^TM platform, which, in pre-clinical studies have been shown to induce rapid and selective cell killing and tumor necrosis. Outside of Japan, Illuminox therapies have not yet been approved as safe or effective by any regulatory authority. The company's first drug developed on the Illuminox platform, ASP-1929, has received approval from the Japanese Ministry of Health, Labour, and Welfare, and is currently the subject of a global phase 3 clinical trial for recurrent head and neck cancer. Rakuten Medical is committed to its mission to conquer cancer and aims to realize a society where cancer patients can lead fulfilling lives. The company has 6 locations in 5 countries, including the United States, where it is headquartered, Japan, the Netherlands, Taiwan, and Switzerland. For more information, visit www.rakuten-med.com. 

About ASP-1929** 

Since 2013, Rakuten Medical, Inc. has been using an exclusively licensed antibody complex to develop new cancer therapies based on its Illuminox^TM technology platform. Rakuten Medical's first pipeline drug developed using its Illuminox platform is ASP-1929, an antibody-dye conjugate comprised of the antibody cetuximab and IRDye® 700DX, a light activatable dye. ASP-1929 binds to epidermal growth factor receptors (EGFR), a cancer antigen expressed in multiple types of solid tumors, including head and neck, cutaneous, esophageal, lung, colon and pancreatic cancers. After binding to cancer cells, ASP-1929 is locally activated by non-thermal red light (690 nm) illumination emitted by a laser device system.  Pre-clinical data indicates that Illuminox technology induces a biophysical process that compromises cell membrane integrity, leading to cancer cell death and tumor necrosis. ASP-1929 received conditional early approval from the Japanese Ministry of Health, Labor, and Welfare in September 2020, and is currently under investigation in a global phase 3 clinical trial for recurrent head and neck cancer. Rakuten Medical, Inc. is moving forward with product development by conducting clinical trials of monotherapy and combination therapy with other drugs. Outside of Japan, ASP-1929 and the laser device system have not yet been approved by any regulatory authority. 

About Illuminox™ platform 

The Illuminox platform is an investigational platform based on a cancer therapy called photoimmunotherapy, which was developed by Dr. Hisataka Kobayashi and team from the National Cancer Institute in the United States. Rakuten Medical is developing the Illuminox platform as a technology consisting of a drug, device, and other related components. The drug component of the platform consists of a targeting moiety conjugated with one or more dyes leading to selective cell surface binding. The device component consists of a light source that locally illuminates the targeted cells with non-thermal light to transiently activate the drug.  Pre-clinical data have shown that this activation elicits rapid and selective necrosis of targeted cells through a biophysical process that compromises the membrane integrity of the targeted cells. Therapies developed on Illuminox may also result in local and systemic innate and adaptive immune activation due to immunogenic cell death of the targeted cells and/or the removal of immunosuppressive elements within the microenvironment. Outside of Japan, Illuminox therapies have not yet been approved as safe or effective by any regulatory authority. 

Forward Looking Statements 

This press release contains forward looking statements that correspond to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements include various risks, uncertainties, and assumptions that may cause Rakuten Medical's business plans and results to differ from the anticipated results and expectations expressed in these statements. These "forward looking statements" contain information about the status and development of our products, including ASP-1929, the Illuminox platform and IRDye® 700DX, as well as other regulatory and marketing authorization efforts, the potential benefits, efficacy, and safety of ASP-1929 and other therapies created using the Illuminox platform, and the status of regulatory filings. The approval and commercial success of such therapies may not be achieved, and the results and effects shown in pre-clinical studies and data may not be replicated in clinical trials. Such statements may include words such as "expect," "believe," "hope," "estimate," "looks as though," "anticipate," "intend," "may," "suggest," "plan," "strategy," "will," "hopeful," "excited," "do," "aims," "develop" and similar expressions. Forward-looking statements are neither historical facts nor assurances of future performance.  Such forward-looking statements are based upon Rakuten Medical's current beliefs, expectations, and assumptions regarding the future of its business, future plans and strategies, projections, anticipated events and trends, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict and many of which are outside of Rakuten Medical's control. Rakuten Medical's actual results and financial condition may differ materially from those indicated in the forward-looking statements. Therefore, you should not rely on any of these forward-looking statements. In addition, this press release uses terms such as "tolerable and manageable safety profile" and "clinically meaningful" to express opinions about clinical trial data. Ongoing clinical trial studies include various risks and uncertainties, in particular, problems that arise during the manufacturing stage of ASP-1929 or other product candidates, the occurrence of adverse safety events, situations in failure to demonstrate therapeutic benefits, and other various risks and uncertainties, both reasonable and unreasonable. For this reason, actual results, including regulatory approvals and uncertainties in the commercialization process of ASP-1929 or other product candidates, may differ from published information. Except to the extent required by applicable law, we undertake no obligation to publicly update this or any other forward-looking statement, whether because of new information, future developments or events, changes in assumptions, changes in the factors affecting forward-looking statements. If one or more forward-looking statement(s) is updated, no inference should be drawn that additional updates will be made to those or other forward-looking statements.

SOURCE Rakuten Medical, Inc.

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