Samarium Sm 153 Lexidronam Pentasodium and Bortezomib in Treating Patients With Relapsed or Refractory Multiple Myeloma

Multiple Myeloma and Plasma Cell Neoplasm Clinical Trial

Official title: A Phase I/II Study of 153 Sm EDTMP (Quadramet™) and PS-341 (Velcade®) in Patients With Relapsed or Refractory Multiple Myeloma

Status Completed

Clinical Trial Summary

RATIONALE: Radioactive drugs, such as samarium Sm 153 lexidronam pentasodium, may carry radiation directly to cancer cells and not harm normal cells. Bortezomib may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth and by blocking blood flow to the cancer. Bortezomib may also make cancer cells more sensitive to radiation therapy. Giving samarium Sm 153 lexidronam pentasodium together with bortezomib may kill more cancer cells.

PURPOSE: This phase I/II trial is studying the side effects and best dose of bortezomib when given together with samarium Sm 153 lexidronam pentasodium and to see how well they work in treating patients with relapsed or refractory multiple myeloma.

Clinical Trial Description

OBJECTIVES:

Primary

• Determine the maximum tolerated dose of bortezomib when given together with samarium Sm 153 lexidronam pentasodium in patients with recurrent or refractory multiple myeloma. (Phase I)

• Determine the safety and tolerability of this regimen in these patients. (Phase II)

• Determine the hematologic response rate in patients treated with this regimen. (Phase II)

Secondary

• Determine the rate of serum immunoglobulin light chain reduction in patients treated with this regimen.

• Assess the in vivo toxicity of this regimen to the progenitor cells by measuring complete blood cell count and micronucleated reticulocyte count in these patients.

OUTLINE: This is a phase I, pilot, open-label, dose-escalation study of bortezomib followed by a phase II study.

• Phase I: Patients receive samarium Sm 153 lexidronam pentasodium IV over 1 minute on day 1 and bortezomib IV over 3-5 seconds on days 2 and 5.

Cohorts of 3-6 patients receive escalating doses of bortezomib until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience dose limiting toxicity.

• Phase II: Patients receive samarium Sm 153 lexidronam pentasodium as in phase I and bortezomib at the MTD determined in phase I .

Patients undergo blood sample collection at baseline and then on days 1-6 for correlative studies. Samples are analyzed for micronucleated reticulocyte count and immunoglobulin free light chain ratio to determine the early effects of treatment.

After completion of study treatment, patients are followed weekly for 7 weeks, monthly for 3 months and then every 3 months for a total of 3 years.

PROJECTED ACCRUAL: A total of 50 patients will be accrued for this study. ;

Study Design

Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Multiple Myeloma
• Multiple Myeloma and Plasma Cell Neoplasm
• Neoplasms, Plasma Cell
• Plasmacytoma

• NCT number: NCT00478075
• Study type: Interventional
• Source: Mayo Clinic
• Status: Completed
• Phase: Phase 1/Phase 2
• Start date: September 2005
• Completion date: June 2009