Cellectar Biosciences Reports Second Quarter 2026 Financial Results and Provides Corporate Updates

About this update from Cellectar Biosciences, Inc.

Site Activation Initiated for Confirmatory Phase 3 Study of Iopofosine I 131 with New Drug Application Submission Planned for mid-2027 under the FDA's Accelerated Approval Program Presented Data from CLOVER WaM Trial of Iopofosine I 131 in relapsed/refractory Waldenström Macroglobulinemia (r/r WM) at the American Society of Clinical Oncology 2026 Annual Meeting Initiated Enrollment and Dosed First Patients in Phase 1b Clinical Trial of CLR 125 in Triple Negative Breast Cancer Announced Publication of Phase 1 Data in Peer-Reviewed Journal Cancers Company to Hold Webcast and Conference Call at 8:30 AM ET Today FLORHAM PARK, N.J., Aug. 13, 2026 (GLOBE NEWSWIRE) -- Cellectar Biosciences, Inc. (NASDAQ: CLRB), a late-stage clinical biopharmaceutical company focused on the discovery and development of drugs for the treatment of cancer, today announced financial results for the quarter ended June 30, 2026, and provided a corporate update. "Our second quarter marked another period of significant execution as we continued to advance multiple programs across our oncology pipeline while laying the foundation for several important near-term catalysts," said James Caruso, president and chief executive officer of Cellectar. "Most notably, we progressed our regulatory strategy for iopofosine I 131 in Waldenström macroglobulinemia, including initiation of site activation activities for our confirmatory Phase 3 trial, which is an important first step toward our accelerated approval application in the U.S., which we plan to submit in mid-2027. The compelling data we continue to generate from the Phase 2b CLOVER WaM study reinforce our belief that iopofosine has the potential to address a critical unmet need for WM patients, including those previously treated with BTK inhibitors and prior to off-label salvage therapies." "At the same time, we continued to expand the clinical validation of our proprietary PDC platform, achieving key enrollment and dosing milestones in our CLR 125 Phase 1b trial in triple-negative breast cancer and advancing our broader radiopharmaceutical portfolio. Supported by a strengthened balance sheet and a clear operational roadmap, we are entering the second half of 2026 with strong momentum, multiple anticipated data and development milestones, and a steadfast commitment to creating long-term value for patients and stockholders." Second Quarter 2026 and Recent Corporate Highlights 2026 Financial Highlights Conference Call & Webcast Details Cellectar management will host a conference call and webcast today, August 13, 2026, at 8:30 AM Eastern Time to discuss these results and answer questions. Stockholders and other interested parties may participate in the conference call by dialing 1-800-717-1738. A live webcast of the conference call can be accessed in the "Events & Presentations" section of Cellectar's website at www.cellectar.com . A recording of the webcast will be available and archived on the company's website for approximately 90 days. About Cellectar Biosciences, Inc. Cellectar Biosciences is a late-stage clinical biopharmaceutical company focused on the discovery and development of proprietary drugs for the treatment of cancer, independently and through research and development collaborations. The company's core objective is to leverage its proprietary Phospholipid Drug Conjugate™ (PDC) delivery platform to develop the next-generation of cancer cell-targeting treatments, delivering improved efficacy and better safety as a result of fewer off-target effects. The company's product pipeline includes iopofosine I 131, which is a PDC designed to provide targeted delivery of iodine-131 (radioisotope). Iopofosine I 131 has been tested in Phase 2b trials as a treatment for relapsed or refractory Waldenström Macroglobulinemia (WM), in relapsed or refractory multiple myeloma (MM) and central nervous system (CNS) lymphoma. The CLOVER-2 Phase 1b study is evaluating iopofosine I 131 in pediatric patients with high-grade gliomas, for which Cellectar is eligible to receive a Pediatric Review Voucher from the FDA upon approval. The FDA has granted iopofosine I 131 Breakthrough, six Orphan Drug, four Rare Pediatric Drug and two Fast Track Designations for various cancer indications, and the EMA has granted iopofosine I 131 PRIority MEdicines (PRIME) designation. Cellectar is also developing CLR 121125 (CLR 125), an iodine-125 Auger-emitting program targeted for solid tumors, such as triple negative breast (TNBC), lung, and colorectal cancer, and is currently being evaluated in a Phase 1b study for TNBC, which will determine the recommended dose for the subsequent Phase 2 trial. CLR 125 has been well tolerated  in vivo  and has demonstrated strong preclinical data showing reduction or inhibition of solid tumor growth. In addition to these assets, the Cellectar team is developing CLR 121225 (CLR 225), an actinium-225 based program targeting solid tumors in indications with significant unmet need, such as pancreatic cancer, as well as proprietary preclinical PDC chemotherapeutic programs and multiple partnered PDC assets. For more information, please visit  https://www.cellectar.com/ or join the conversation by liking and following us on the company's social media channels:  X ,  LinkedIn , and  Facebook . Forward Looking Statements Disclaimer This news release contains forward-looking statements. You can identify these statements by our use of words such as "may," "expect," "believe," "anticipate," "intend," "could," "estimate," "continue," "plans," or their negatives or cognates. These statements are only estimates and predictions and are subject to known and unknown risks and uncertainties that may cause actual future experience and results to differ materially from the statements made. These statements are based on our current beliefs and expectations as to such future outcomes. Drug discovery and development involve a high degree of risk. Factors that might cause such a material difference include, among others, uncertainties related to the ability to identify suitable collaborators, partners, licensees or purchasers for our product candidates and, if we are able to do so, to enter into binding agreements with regard to any of the foregoing, or to raise additional capital to support our operations, or our ability to fund our operations if we are unsuccessful with any of the foregoing. A complete description of risks and uncertainties related to our business is contained in our periodic reports filed with the Securities and Exchange Commission including our Form 10-K for the year ended December 31, 2025, and our Form 10-Q for the quarterly period ended March 31, 2026. These forward-looking statements are made only as of the date hereof, and we disclaim any obligation to update any such forward-looking statements. INVESTORS: Anne Marie Fields Precision AQ 212-362-1200 [email protected]

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