Cellectar’s CLR 131 Receives FDA Orphan Drug Designation for Treatment of Ewing’s Sarcoma

Cellectar Biosciences (Nasdaq:CLRB), a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of drugs for the treatment of cancer, announces that the U.S. Food and Drug Administration (FDA) Office of Orphan Products Development has granted Orphan Drug Designation (ODD) to CLR 131, the company’s lead Phospholipid Drug Conjugate™ (PDC) product candidate, for the treatment of Ewing’s sarcoma, a rare pediatric cancer.

"Ewing’s sarcoma is the second most common bone malignancy among children and adolescents and there are limited treatment options for patients who relapse or become refractive to therapy," said John Friend, M.D., chief medical officer of Cellectar. "The ODD for Ewing’s sarcoma represents another important milestone for our CLR 131 pediatric program as we work to bring new options to patients suffering from rare cancers."

The FDA grants orphan drug designation to therapies targeted at conditions that affect fewer than 200,000 people in the United States. The designation provides seven-year market exclusivity, increased engagement and assistance from the FDA, tax credits for certain research, research grants and a waiver of the New Drug Application user fee. In 2018 the FDA also granted CLR 131 orphan drug and rare pediatric disease designations for the treatment of neuroblastoma and rhabdomyosarcoma.

Cellectar is currently initiating a Phase 1 clinical study evaluating CLR 131 for the potential treatment of pediatric patients with Ewing’s sarcoma, rhabdomyosarcoma, osteosarcoma, neuroblastoma, high grade glioma and lymphomas. Cellectar has received clearance from the FDA to proceed with an accelerated Phase 1 trial, designed to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of CLR 131 in pediatric patients with these cancer types. Further details about the trial can be found at clinicaltrials.gov using the identifier number NCT03478462.

About Ewing’s Sarcoma
Ewing’s sarcoma is the second most common bone malignancy among children and adolescents. According to a study published in the Journal of Hematology/Oncology, the incidence is about 3 cases per 1 million per year in children younger than age 20. Despite the favorable prognosis, an American Cancer Society study showed that approximately 30-40% of patients develop metastases or local recurrence, and the long-term survival rate for refractory or recurrent disease is only 22-24%. The relapsed and refractory statistics underscore the need for new treatment options. 

About CLR 131
CLR 131 is Cellectar’s investigational radioiodinated PDC therapy that exploits the tumor-targeting properties of the company's proprietary phospholipid ether (PLE) and PLE analogs to selectively deliver radiation to malignant tumor cells, thus minimizing radiation exposure to normal tissues. CLR 131, is in a Phase 2 clinical study in relapsed or refractory (R/R) MM and a range of B-cell malignancies and a Phase 1 clinical study in patients with (R/R) MM exploring fractionated dosing. The company is currently initiating a Phase 1 study with CLR 131 in pediatric solid tumors and lymphoma, and is planning a second Phase 1 study in combination with external beam radiation for head and neck cancer.

About Cellectar Biosciences, Inc.
Cellectar Biosciences is focused on the discovery, development and commercialization of drugs for the treatment of cancer. The company plans to develop proprietary drugs independently and through research and development (R&D) collaborations. The core drug development strategy is to leverage our PDC platform to develop therapeutics that specifically target treatment to cancer cells. Through R&D collaborations, the company’s strategy is to generate near-term capital, supplement internal resources, gain access to novel molecules or payloads, accelerate product candidate development and broaden our proprietary and partnered product pipelines.

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