CLR 131



CLR 131 is an investigational compound under development for a range of hematologic malignancies. It is currently being evaluated in a Phase I and Phase II clinical trial in patients with relapsed or refractory hematological diseases. Based upon pre-clinical and interim Phase I study data, treatment with CLR 131 provides patients with a novel approach to treating hematological diseases and may provide patients with an improvement in progression-free survival and overall quality of life. CLR 131 utilizes the company’s patented Phospholipid Drug Conjugate (PDC) tumor targeting delivery platform to deliver a cytotoxic radioisotope, iodine-131 directly to tumor cells. The FDA has granted Cellectar an orphan drug designation for CLR 131.

SparkCures ID 222
Developed By Cellectar Biosciences
Generic Name CLR 131
Additional Names I-131-CLR1404
Treatment Classifications
  • Phospholipid Drug Conjugate (PDC)

Clinical Trials

All Clinical Trials

View all active clinical trials around the US.

Early Relapse Multiple Myeloma

The following is a listing of clinical trials for patients with multiple myeloma who have received one to two prior lines of therapy.

Late Relapse Multiple Myeloma

The following is a listing of clinical trials for patients with multiple myeloma who have received three or more prior lines of therapy.

Smoldering Myeloma
Monoclonal Gammopathy of Undetermined Significance (MGUS)

Published Results

Cellectar Provides Update on Phase 1 Trial of CLR 131 in Relapsed/Refractory Multiple Myeloma

January 07, 2019

Cellectar Biosciences (Nasdaq: CLRB), a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of drugs for the treatment of cancer, today announced median overall survival (mOS) in Cohorts 1-4 of the company’s ongoing Phase 1 clinical trial evaluating CLR 131 for the treatment of relapsed/refractory (R/R) multiple myeloma (MM). The results showed median overall survival of 22.0 months among 15 patients, all of whom were heavily pretreated, averaging five prior lines of systemic therapy. Each patient in Cohorts 1-4 of this dose-escalation study received a single 30-minute infusion of CLR 131.

All patients enrolled in Cohorts 1 through 4 were previously treated with both proteasome inhibitors and immunomodulatory drugs, and experienced disease progression with greater than one-third dual refractory. While no head-to-head studies have been conducted between CLR 131 and other therapies in this heavily pretreated population, for background purposes, a 2016 article published in the journal Bone Marrow Transplantation refractory to both proteasome inhibitors and immunomodulatory drugs achieve median overall survival of 9 months. Additionally, median overall survival for relapsed/refractory multiple myeloma patients receiving treatment in third line averages approximately 12 months of survival, including several recently approved drugs.

“The median overall survival of 22 months in this heavily pretreated patient population is very encouraging. These are patients with limited therapeutic options and, unfortunately, face poor prognoses,” said James Caruso, president and chief executive officer of Cellectar Biosciences. “The convenience afforded by CLR 131 delivered in only one or two doses as currently administered in our ongoing hematology studies makes it a far less intrusive regimen than other treatments that must be administered at regular dosing intervals. We believe extending median overall survival with a more patient-friendly dosing regimen provides both a distinctive product profile and the potential to provide beneficial patient outcomes even in later lines of therapy.”


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