NCT02478125

Pilot Study of Mobilization and Treatment of Disseminated Tumor Cells in Men With Metastatic Prostate Cancer

A Pilot Study of Mobilization and Treatment of Disseminated Tumor Cells in Men With Metastatic Prostate Cancer

• Status: Terminated
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 3 (actual)
• Sponsor: Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins · Academic / Other
• Sex: Male
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Hypothesis: Treatment with Burixafor hydrobromide will effectively mobilize metastatic prostate cancer (PCa) cells (i.e. disseminated tumor cells; DTCs) into the blood from the bone marrow. It has been demonstrated that prostate cancer cells have been mobilized out of the bone marrow of mice utilizing an anti-CXCR4 strategy; making them more susceptible to chemotherapy.

Detailed description

This is an open label, multiple site, pilot study. Hypothesis: Treatment with Burixafor hydrobromide will effectively mobilize metastatic prostate cancer (PCa) cells (i.e. disseminated tumor cells; DTCs) into the blood from the bone marrow. In preclinical models, these bone marrow niche engaged cells are more resistant to therapy as compared to soft tissue sites. It has been demonstrated that prostate cancer cells have been mobilized out of the bone marrow of mice utilizing an anti-CXCR4 strategy; making them more susceptible to chemotherapy. Currently, the anti-CXCR4 agent plerixafor is FDA approved to be given for up to 4 consecutive days in order to mobilize hematopoietic stem cells (HSCs). Burixafor hydrobromide is a potent anti-CXCR4 agent that is in clinical trials. Burixafor hydrobromide, alone or in combination with G-CSF, is currently in Phase II testing for use as a hematopoetic stem cell (HSC) mobilization agent. When Burixafor hydrobromide is given intravenously (IV) alone at a dose of 3.14 mg/kg it has been shown to result in a 7.8 fold mean increase in peripheral blood CD34+ (a HSC marker) cells 6-hours post-infusion.

Conditions

• Prostate Cancer

Interventions

Type	Name	Description
DRUG	Burixafor Hydrobromide	Investigators will determine the kinetics of PCa cell release into the blood with four daily dosages of Burixafor hydrobromide alone or in combination with G-CSF
DRUG	Docetaxel	Investigators will administer a single 75 mg/m2 IV dose of docetaxel. Twenty-one days later investigators will re-treat enrolled men with the optimal mobilization strategy + docetaxel IV. The second dose of docetaxel being given in combination with the optimal mobilization strategy will be chosen according to a standard 3+3 dose escalation schema, in which the dose of bruixafor +/- G-CSF will be held constant and the dose of docetaxel will escalate between three dose-levels: 1) docetaxel 30 mg/m2 IV, 2) docetaxel 60 mg/m2 IV, and 3) docetaxel 75 mg/m2
DRUG	G-CSF	G-CSF will be given as a daily subcutaneous (SC) injection beginning 4 days prior to Burixafor hydrobromide and continuing through the 4 days of Burixafor hydrobromide treatment

Timeline

• Start date: 2016-07-01
• Primary completion: 2017-05-01
• Completion: 2017-05-01
• First posted: 2015-06-23
• Last updated: 2019-01-18

Locations

1 site across 1 country: United States