Plus Therapeutics Provides Business Update on REYOBIQ™ Clinical Program and U.S. CNSide® Commercialization

HOUSTON, Jan. 22, 2026 (GLOBE NEWSWIRE) -- Plus Therapeutics, Inc. (NASDAQ:PSTV) (the "Company"), a healthcare company developing and commercializing precision diagnostics and radiopharmaceuticals for central nervous system (CNS) cancers, today provides a business update and highlights REYOBIQ clinical progress and CNSide US commercialization.

"Our 2 key goals in 2026 are CNSide commercial scale-up and REYOBIQ pivotal trial readiness," said Dr. Marc H. Hedrick, President & Chief Executive of Plus Therapeutics. "Our recently completed upsized $15 million offering will fuel faster progress in these core areas of the business and extend our cash runway through 2027."

Overview of anticipated company milestones for 2026:

REYOBIQ clinical program:

• Define optimal dose/interval for REYOBIQ in the ReSPECT-LM Phase 2 trial; anticipate reporting data in Q3 2026
• Completing enrollment in the ReSPECT-GBM Phase 2 trial for glioblastoma and conduct an end of phase meeting with the FDA to align on pivotal trial design, with data expected in Q4 2026
• Complete commercial manufacturing scale up for REYOBIQ
• Begin enrollment in the ReSPECT-PBC pediatric brain cancer Phase 1 trial

CNSide commercial roll out:

• Obtain a total of 150 million US lives covered under multiple commercial payor agreements
• Obtain Medicare and Medicaid coverage  
• Achieve a commercial order rate in excess of 1,250 tests per year
• Launch portfolio of additional CSF tumor characterization tests that expand the CNSide testing platform

For additional information, the Company's corporate presentation can be found here.

Webcast and Conference Call

Plus Therapeutics will host a conference call and webcast today, January 22, 2026, at 9:00 a.m. ET to discuss and provide additional details on the business update. Participants can dial in to the call using 1-888-349-0106. Please dial in 15 minutes prior to the start time and ask to be joined to the Plus Therapeutics, Inc. conference call. A live webcast of the conference call will be available here as well as on the Investor Relations section of the Company's website at ir.plustherapeutics.com. The webcast will be archived on the website following the completion of the call.

About LM

Leptomeningeal metastases (LM) are a rare but severe complication of advanced cancer, affecting the fluid-lined structures of the central nervous system. LM occurs in approximately 5% of patients with metastatic cancer, with breast cancer, lung cancer, and melanoma being the most common sources. Median survival is typically 2-6 months, and effective treatment options are limited, highlighting the urgent need for novel therapies.

About REYOBIQ™ (rhenium Re186 obisbemeda)

REYOBIQ (rhenium Re186 obisbemeda) is a novel injectable radiotherapy specifically formulated to deliver direct targeted high dose radiation in CNS tumors in a safe, effective, and convenient manner to optimize patient outcomes. REYOBIQ has the potential to reduce off target risks and improve outcomes for CNS cancer patients, versus currently approved therapies, with a more targeted and potent radiation dose. Rhenium-186 is an ideal radioisotope for CNS therapeutic applications due to its short half-life, beta energy for destroying cancerous tissue, and gamma energy for real-time imaging. REYOBIQ is being evaluated for the treatment of recurrent glioblastoma, leptomeningeal metastases, and pediatric brain cancer in the ReSPECT-GBM, ReSPECT-LM, and ReSPECT-PBC clinical trials. ReSPECT-GBM is supported by an award from the National Cancer Institute (NCI), part of the U.S. National Institutes of Health (NIH), and ReSPECT-LM is funded by a three-year $17.6M grant by the Cancer Prevention & Research Institute of Texas (CPRIT). The Company's ReSPECT-PBC clinical trial for pediatric brain cancer is supported by a $3 million grant from the U.S. Department of Defense's Peer Reviewed Cancer Research Program.

About CNSide Diagnostics, LLC

CNSide Diagnostics, LLC is a wholly owned subsidiary of Plus Therapeutics, Inc. that develops and commercializes proprietary laboratory-developed tests, such as CNSide^®, designed to identify tumor cells that have metastasized to the central nervous system in patients with carcinomas and melanomas. The CNSide^® CSF Assay Platform enables quantitative analysis of the cerebrospinal fluid that informs and improves the management of patients with leptomeningeal metastases.

About Plus Therapeutics

Headquartered in Houston, Texas, Plus Therapeutics, Inc. is a clinical-stage pharmaceutical company developing targeted radiotherapeutics for difficult-to-treat cancers of the central nervous system with the potential to enhance clinical outcomes. Combining image-guided local beta radiation and targeted drug delivery approaches, the Company is advancing a pipeline of product candidates with lead programs in leptomeningeal metastases (LM) and recurrent glioblastoma (GBM). The Company has built a supply chain through strategic partnerships that enable the development, manufacturing, and future potential commercialization of its products.

Forward Looking Statements

This press release contains statements that may be deemed "forward-looking statements" within the meaning of U.S. securities laws. All statements in this press release other than statements of historical fact are forward-looking statements. These forward-looking statements may be identified by future verbs, as well as terms such as "expect," "anticipate" "intend," "believe," "estimate," "will," and similar expressions or the negatives thereof. Such statements are based upon certain assumptions and assessments made by management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. The forward-looking statements included in this press release could differ materially from those expressed or implied by these forward-looking statements because of risks, uncertainties, and other factors that include, but are not limited to, the following: expectations regarding the completion of the proposed offering; the Company's ability to successfully raise sufficient capital on reasonable terms or at all; available cash on hand and contractual and statutory limitations that could impair our ability to pay future dividends; our ability to complete our pre-clinical or clinical studies; and changes in local or national economic conditions. This list of risks, uncertainties, and other factors is not complete. Any or all forward-looking statements the Company makes may turn out to be wrong and can be affected by inaccurate assumptions the Company might make or by known or unknown risks, uncertainties, and other factors, including those identified in this press release. Accordingly, you should not place undue reliance on the forward-looking statements made in this press release, which speak only as of its date. There may be events in the future that the Company is unable to predict, or over which it has no control, and its business, financial condition, results of operations and prospects may change in the future. The Company assumes no responsibility to update or revise any forward-looking statements to reflect events, trends or circumstances after the date they are made unless the Company has an obligation under U.S. federal securities laws to do so.

Investor Contact

CORE IR

investor@plustherapeutics.com