This is an initial study to determine if CXCR4 inhibitor AMD 3100 or plerixafor may be a potential treatment for neutropenia due to CXCR4 mutations, the myelokathexis or WHIM (warts, hypogammaglobulinemia, immunodeficiency and myelokathexis) syndrome. This is the initial study of this concept and will involve up to 6 patients to receive increasing doses of plerixafor administered subcutaneously or on an alternate day basis. It is unknown if these patients will be highly sensitive to a blockade of CXCR4 activity and release more white blood cells than normal volunteers or cancer patients given the same dose of this drug. Therefore doses will begin at a level 12 fold less than currently used to mobilize stem cells and will be increased stepwise to achieve an acceptable circulating level of neutrophils.
Full Title of Study: “A Phase I Study of the CXCR-4 Inhibitor AMD3100 for the Treatment of Neutropenia Due to Mutations of CXCR-4, the Myelokathexis Syndrome”
- Study Type: Interventional
- Study Design
- Allocation: N/A
- Intervention Model: Single Group Assignment
- Primary Purpose: Treatment
- Masking: None (Open Label)
- Study Primary Completion Date: March 2011
This is an open label, single Center, phase I study to examine the hematological effects, pharmacokinetics and safety of plerixafor in patients with myelokathexis attributable to mutations of CXCR4, utilizing serial, escalating doses of plerixafor administered on days 1, 3, 5, 8, and 10. Five intrapatient escalating dose levels, 20 micrograms per kilogram (mcg/kg), 40 micrograms/kilogram(mcg/kg), 80 micrograms/kilogram(mcg/kg), and 240 micrograms/kilogram (mcg/kg)will be examined. The subjects will be patients at the University of Washington General Clinical Research Center for up to 10 days; the study requires subject be available for up to 14 days. Patients will be monitored for hematological effects of plerixafor and observed for adverse effects. If a normal blood neutrophil count is achieved and maintained for at least 24 hours prior to the highest dose, we will stop at that level.
- Drug: AMD3100 or plerixafor
- The study will examine the hematological effects/safety of plerixafor in patients with myelokathexis attributable to mutations of CXCR4. Plerixafor will be administered on days 1, 3, 5, 8, and 10. Five intrapatient escalating doses of AMD 3100, 20 micrograms per kilogram (mcg/kg), 40 micrograms per kilogram (mcg/kg), 80 micrograms per kilogram (mcg/kg), and 240 micrograms per kilogram (mcg/kg) will be examined in the patients at University of Washington General Clinical Research Center for up to 10 days, requiring subjects be available up to 14 days. Patients will be monitored for hematological effects of plerixafor and observed for adverse effects. If normal blood neutrophil count is achieved and maintained for at least 24 hours prior to highest dose, we will stop at that level.
Arms, Groups and Cohorts
- Experimental: AMD3100 or plerixafor
- SINGLE arm study with increasing doses of Plerixafor
Clinical Trial Outcome Measures
- Blood Neutrophil Counts.
- Time Frame: up to 14 days, depending on when subject reached peak response, i.e., the highest count after the stimulus (plerixafor)
- Effectiveness of drug based on increases of blood neutrophil counts to greater than 2.0 x 10^9 per liter
Participating in This Clinical Trial
Gender Eligibility: All
Minimum Age: 18 Years
Maximum Age: N/A
Are Healthy Volunteers Accepted: No
- Lead Sponsor
- University of Washington
- Provider of Information About this Clinical Study
- Principal Investigator: David Dale, Professor – University of Washington
- Overall Official(s)
- David C Dale, MD, Principal Investigator, University of Washington
Citations Reporting on Results
Dale DC, Bolyard AA, Kelley ML, Westrup EC, Makaryan V, Aprikyan A, Wood B, Hsu FJ. The CXCR4 antagonist plerixafor is a potential therapy for myelokathexis, WHIM syndrome. Blood. 2011 Nov 3;118(18):4963-6. doi: 10.1182/blood-2011-06-360586. Epub 2011 Aug 11.
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