Dose Escalation Study of I-131-CLR1404 in Patients With Relapsed or Refractory Multiple Myeloma


About this study

The primary objective of the study is to determine the safety and tolerability of I-131-CLR1404, with and without concurrent weekly dexamethasone, in patients with relapsed or refractory multiple myeloma who have previously been treated with, or are intolerant of, an immunomodulator and a proteasome inhibitor.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Histologically or cytologically confirmed multiple myeloma
  • Prior treatment with or intolerance to proteasome inhibitor and immunomodulator
  • Bone marrow biopsy within 28 days of study drug infusion demonstrating at least 5% plasma cell involvement
  • Progressive disease defined by any of following: 25% increase in serum M-protein from lowest response value during (or after) last therapy and/or absolute increase in serum M-protein of > or equal to 0.5 g/dL; 25% increase in urine M-protein from lowest response value during (or after) last therapy and/or absolute increase in urine M-protein of > or equal to 200 mg/24h; 25% increase in bone marrow plasma cell percentage from lowest response value during (or after) last therapy - absolute bone marrow plasma cell percentage must be > or equal to 10% unless prior complete response when absolute bone marrow plasma cell percentage must be > or equal to 5%; new onset hypercalcemia > 11.5 mg/dL
  • Measurable disease defined by any of following: Serum M-protein > 1 g/dL; Urine M-protein > 200 mg/24h; Serum free light chain (FLC) assay: involved FLC level > or equal to 10 mg/dL provided serum FLC ratio is abnormal; subjects who are non-secretors will be considered on a case-by-case basis
  • Eastern Cooperative Oncology Group performance status of 0 to 2
  • Life expectancy of at least 6 months
  • Have initiative and means to be compliant with protocol and within geographical proximity to make required study visits as judged by Investigator
  • Subject or legal representative has ability to read, understand and provide written informed consent for study related procedures
  • Women of childbearing potential must have negative pregnancy test within 24 hours of enrollment
  • Women of childbearing potential and men who are able to father a child, must agree to use an effective contraception method during study and for 12 months following study drug administration

Exclusion Criteria:

  • Grade 2 or greater toxicities due to previous therapies, subject to laboratory abnormalities listed below. Stable, tolerable Grade 2 adverse events may be allowed at discretion of Investigator
  • Prior external beam radiation therapy resulting in greater than 20% total bone marrow receiving greater than 20 Gy
  • Prior radioisotope therapy
  • Prior total body or hemi-body irradiation
  • Extradural tumor in contact with the spinal cord or tumor located where swelling in response to therapy may impinge upon spinal cord
  • Subject has any of following laboratory abnormalities: WBC < 3000/uL; ANC < 1500/uL; Hemoglobin < 8 g/dL; Estimated glomerular filtration rate < 30 mL/min/1.73 m2; ALT > 3 x ULN ; Bilirubin > 1.5 x ULN
  • Platelet count < 100,000/uL without full-dose anticogulation therapy
  • Platelet count < 150,000/uL with ongoing full-dose anticoagulation therapy
  • Clinically significant bleeding event, as judged by investigator, within prior 6 months
  • Chronic immunosuppressive therapy
  • Anti-platelet therapy, except low-dose aspirin for cardioprotection
  • PTT > 1.3 x ULN
  • INR > 1.3
  • Radiation therapy, chemotherapy, immunotherapy, investigational therapy or corticosteroid use within 2 weeks of or after eligibility-defining bone marrow biopsy. Bisphosphonates and denosumab are permitted if subject has been receiving for at least 90 days
  • History of hypersensitivity to iodine
  • Any other concomitant serious illness or organ system dysfunction in opinion of Investigator would either compromise subject safety or interfere with test drug safety evaluation
  • Major surgery within 6 weeks of enrollment
  • Known history of HIV, hepatitis C or hepatitis B infection
  • Pregnancy or breast-feeding

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Jacksonville, Fla.

Mayo Clinic principal investigator

Sikander Ailawadhi, M.D.

Closed for enrollment

Contact information:

Cancer Center Clinical Trials Referral Office

(855) 776-0015

More information


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