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DCL-17-001 - An Open-Label, Dose Escalation, Efficacy, and Safety Study of CLR 131 in Children and AYA with Select Solid Tumors, Lymphoma, and Malignant Brain Tumors (CLOVER-2) and Expansion in Children, AYA with Relapsed or Refractory High Grade Glioma


DCL-17-001 - An Open-Label, Dose Escalation, Efficacy, and Safety Study of CLR 131 in Children and AYA with Select Solid Tumors, Lymphoma, and Malignant Brain Tumors (CLOVER-2) and Expansion in Children, AYA with Relapsed or Refractory High Grade Glioma

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DiagnosisGlioblastoma, Astrocytoma, Oligodendroglioma, Mixed Glioma, Pleomorphic Xanthoastrocytoma, Ganglioglioma, DIPG, Ependymoma Study StatusOpen
AgeChild, Adult - (10 years to 25 years)RandomisationNO
Line of treatmentDisease relapse or progression
Routes of Treatment AdministrationCLR 131 administered intravenously, fractionated dose Arm 1: two planned cycles, 20 mCi/m2 on day 1 and day 15 Arm 2: three planned cycles, 10mCi/m2 on day 1 and day 15
Last Posted Update2024-05-09 #NCT03478462
International Sponsor
Cellectar Biosciences, Inc.
Principal Investigators for Canadian Sites
The Hospital for Sick Children - Dr. Daniel Morgenstern
Medical contact

Dr. Daniel Morgenstern

Social worker/patient navigator contact

Karen Fung

Clinical research contact

New Agent and Innovative Therapies (NAIT)




Study Description

Brief Summary:

The study evaluates CLR 131 in children, adolescents, and young adults with relapsed or refractory High Grade Glioma (HGG) for which there are no standard treatment options with curative potential.

Part A for Solid Tumors, Lymphoma, and Malignant  Brain Tumors is now closed. This study is exclusively enrolling on Part B for HGG


Detailed Description:

Even with standard, highly toxic multimodality therapies and salvage regimen, most pediatric patients with primary metastatic or relapsed solid tumors are confronted with a poor prognosis. For these patients there is currently no accepted successful treatment regimen. There is a need for new drugs, including targeted radiopharmaceuticals, preferably with cancer-specific uptake and broad applicability for these rare pediatric malignancies.

CLR 131 is a radioiodinated therapeutic that exploits the selective uptake and retention of phospholipid ethers (PLEs) by malignant cells. Cellectar Biosciences' novel cancer-targeted small-molecule compound (CLR1404) is radiolabeled with the isotope iodine-131 (I-131). CLR 131 has demonstrated tumor selective uptake across numerous adult and pediatric cancer cell types. Therapeutic efficacy has been demonstrated in various pediatric and adult-type cancer xenograft models, confirming the ability of CLR 131 to target tumors.

Based on the critical unmet medical need for effective agents with novel mechanisms of action in relapsed pediatric cancers and initial preclinical and clinical experience with radioiodinated CLR1404, Cellectar Biosciences has chosen to assess CLR 131 in a phase 1 pediatric trial.

Inclusion Criteria
  • Previously confirmed (histologically or cytologically) HGG that is clinically or radiographically suspected to be relapsed, refractory, or recurrent. Patients with DIPG are exempt from histologic verification if they have typical MRI findings of DIPG (i.e., hypo- or isointense on T1-weighted imaging, hyperintense on FLAIR or T2-weighted imaging, epicenter in the pons, greater than 50% of pons involved) and the risk of tumor biopsy is prohibitive
  • Patient is ≥ 10 years and ≤ 25 years of age at time of consent/assent
  • Patients ≥ age 16 years must have a Karnofsky performance status of ≥ 60. Patients < age 16 years must have a Lansky performance status of ≥ 60
  • Patients must meet the following lab criteria:
    • Platelets ≥ 75,000/µL [75 x 109 /L] (last transfusion, if any, must be at least 1 week prior to study registration, and, unless deemed medically necessary, no transfusions are allowed between registration and dosing)
    • Absolute neutrophil count ≥ 750/µL [0.75 x109/L]
    • Hemoglobin ≥ 8 g/dL [80 g/L] (last transfusion must be at least 1 week prior to study registration, and, unless deemed medically necessary, no transfusions are allowed between registration and dosing)
    • Using the bedside Schwartz formula [Schwartz 2009], estimated GFR (creatinine clearance) > 60 ml/min/1.73m2
    • Alanine aminotransferase < 3 × ULN
    • Bilirubin < 2 × ULN
  • At least 1 measurable intracranial lesion with longest diameter of at least 10 mm on any imaging sequence.
  • Patients with previously known neurological deficits must be clinically stable for one week prior to enrollment and be able to complete all study related procedures
  • If patient receives steroids for neurological symptom control, the dose must be stable (unchanged for one week prior to enrollment) or on a steroid tapering regimen. Initiation of steroids per routine care immediately prior to CLR 131 dosing is acceptable.
  • Patient or his or her legal representative is judged by the Investigator to have the initiative and means to be compliant with the protocol.
  • Patient or his or her legal representative has the ability to read, understand, and provide written informed consent for the initiation of any study-related procedures.
  • Female patients of childbearing potential must have a negative pregnancy test at screening and within 24 hours of dosing. It is recommended that female caregivers of childbearing potential have a negative pregnancy test within one week of dosing.
  • Patients of childbearing potential must practice an effective method of birth control while participating on this study to avoid possible harm to the fetus.


Exclusion Criteria
  • Antitumor therapy or investigational therapy, within three-half-lives of the agent preceding the present study. For certain types of radiation (craniospinal, total abdominal, whole lung [spot irradiation to skull-based metastases is not considered craniospinal radiation for the purposes of this study]), at least 3 months must have elapsed. Palliative focal radiation to non-target lesions should be completed at least 2 weeks prior to dosing. NOTE: Patients participating in non-interventional clinical trials (i.e., non-drug) are allowed to participate in this trial.
  • History of hypersensitivity to thyroid protection medication (e.g., potassium iodide, Lugol’s solution, etc.)
  • Any other concomitant serious illness or organ system dysfunction (including cardiac and pulmonary dysfunction) that in the opinion of the Investigator would either compromise patient safety or interfere with the evaluation of the safety of the test drug.
  • Major surgery within 6 weeks of enrollment unless delay in therapy poses unacceptable risk to the patient due to clinical progression (enrollment of such patients should be discussed with Medical Monitor).
  • Known history of human immunodeficiency virus or uncontrolled, serious, active infection.
  • Pregnancy or breastfeeding