Study of Plerixafor for Rescue of Poor Mobilizers in Autologous Stem Cell Transplant

Phase 2

Completed

Brief Summary: Plerixafor, administered at a dose of 240 ug/kg, potentiates the effect of granulocyte colony-stimulating factor (G-CSF) to increase peripheral blood progenitor cells in both healthy volunteers and cancer patients. Furthermore, in cancer patients, cells collected via apheresis using Plerixafor and G-CSF have been successfully transplanted. In December 2008, Plerixafor received approval from the Food and Drug administration for use in combination with G-CSF to aid in mobilization of progenitor cells for apheresis. The proposed study is not designed to support approval of a new indication or change in the advertising for Plerixafor. The route of administration and dosage level are identical to that which is listed on the package insert. Although Plerixafor is not approved for patients with Hodgkins Lymphoma, there is no known or theoretic increased risk of the use of this drug in this patient population.

The study hypothesis for this study is that patients with a circulating CD34+ count \< 20 cells/ul after 5 days of mobilization with G-CSF alone will achieve \> or equal to 2 X 10(6)CD34+ cells/kg within 3 days of apheresis after receiving Plerixafor with G-CSF.

Detailed Description: This is a single-center, Phase 2, open-label study. All patients diagnosed with non-hodgkins lymphoma, hodgkins disease or multiple myeloma and candidates for autologous transplantation are eligible to enter into the study. The only change to the standard of care is the addition of 240 ug/kg Plerixafor following 5 days of (G-CSF) mobilization.

The results of the study will provide both numeric and categorical estimates of measurements of the safety and efficacy of Plerixafor. The primary efficacy endpoint, Treatment Success, is a binary response variable categorizing whether the patient was able to mobilize at least 2 X 10(6) CD34+ cells/kg within 3 days of apheresis.

The percentage of patients achieving Treatment Success will be summarized. All AEs will be followed for 30 days after the last apheresis or until the first dose of ablative chemotherapy, whichever occurs first. All SAEs will be followed for 6 months post-transplant or until relapse. All patients who receive at least one dose of Plerixafor will be included in all summaries of AEs.

Recruitment & Eligibility

Inclusion Criteria

Age 18 to 75 years.
Diagnosis of NHL, HD or MM
Eligible for autologous transplantation
CD34+ cell count < 7 cells/ul after 5 days of mobilization with G-CSF or CD34+ cell count between 7 and 19 (inclusive) on day 5 of mobilization with G-CSF and < 1.3 x 106 CD34+ cells collected by apheresis on day 5 of G-CSF therapy.
< or equal to 5 prior regimens of chemotherapy (Rituxan is not considered chemotherapy for the purpose of this study)
≥ 3 weeks since last cycle of chemotherapy and the beginning of G-CSF mobilization (Rituxan and Lenalidomide are not considered chemotherapy for the purpose of this study)
Total dose of melphalan < or equal to 200 mg
ECOG performance status of 0 or 1
Recovered from all acute toxic effects of prior chemotherapy
Absolute PMN count > 1.0 X 10(9)/l prior to first dose of G-CSF
PLT count > 75 X 10(9)/l prior to first dose of G-CSF
Serum creatinine < or equal to 2.5 mg/dl
SGOT, SGPT and total bilirubin < 2 X upper limit of normal (ULN) prior to the first dose of G-CSF
Cardiac and pulmonary status sufficient to undergo apheresis and transplantation as determined by standard institutional practice
Signed informed consent
Patients of childbearing potential agree to use an approved form of contraception

Exclusion Criteria

A co-morbid condition which, in the view of the investigator, renders the patient at high risk from treatment complications
Failed previous stem cell collection or collection attempts
A residual acute medical condition resulting from prior chemotherapy
Active brain metastases or carcinomatous meningitis
Active infection requiring antibiotic treatment (excluding controlled catheter-related bacteremia)
Received prior radio-immunotherapy with Zevalin or Bexxar
Received thalidomide, dexamethasone, and/or Velcade within 7 days prior to the first dose of G-CSF
Positive pregnancy test in female patients
Lactating females
Patients who previously received experimental therapy within 4 weeks of enrolling in this protocol

Arm && Interventions

Group	Intervention	Description
G-CSF plus Plerixafor	G-CSF plus Plerixafor	Patients who were unable to mobilize a minimum number of cells (CD34+ cell count \<20 cells/ul)following 5 days of G-CSF mobilization.

Primary Outcome Measures

Name	Time	Method
Number of Participants Who Achieved > or Equal to 2 X 10(6)CD34+ Cells/kg Within 3 Days of Apheresis After Receiving Plerixafor With G-CSF.	5 days after receiving G-CSF

Secondary Outcome Measures

Name	Time	Method
Number of Participants Experiencing a Grade III/IV Toxicity	6 months post transplant or until relapse	Safety of plerixafor as measured by Grade III/IV Toxicity
Number of Subjects Experiencing Graft Failure	12 months	To investigate the hematological activity of Plerixafor as measured by Graft Failure. Graft failure is defined as failure of initial engraftment (primary graft failure) or initial engraftment, but subsequent loss of hematopoiesis (secondary graft failure).
Days to Absolute Neutrophil Count >500	12 months
Number of Subjects Experiencing Durability of Engraftment	12 months	Durability of engraftment is defined as the duration and stability of hematopoiesis following autologous transplantation. Subjects who experience durable engraftment have neutrophil counts greater than 500 and platelet counts greater than 20,000 within the specified time frame.
Platelet Engraftment	12 months	Days to platelet count \>20,000

Locations (1): Duke University Medical Center
🇺🇸
Durham, North Carolina, United States