Demonstrated Favorable Safety Profile and Preliminary Clinical Activity in 

Relapsed/Refractory Multiple Myeloma

Publication Supports Continued Development of Iopofosine I 131 as a Novel Targeted

Radiotherapeutic Across Multiple B-Cell Malignancies

FLORHAM PARK, N.J., July 15, 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 the publication of results from a Phase 1 dose-escalation study evaluating iopofosine I 131 in combination with low-dose dexamethasone in 31 patients with heavily pretreated relapsed/refractory multiple myeloma (r/r MM). The manuscript, titled "A Phase I Trial of Iopofosine I 131 and Dexamethasone in Patients with Relapsed/Refractory Multiple Myeloma," was published in the peer-reviewed journal, Cancers.

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