Haploidentical PBMC Transplant for Severe Congenital Anemias

Phase 1

Active, not recruiting

Conditions: Sickle Cell Anemia

Interventions: Procedure: PBSC Transplant
Drug: Alemtuzumab
Drug: Sirolimus
Procedure: Low Dose Irradiation
Drug: Cyclophosphamide

Registration Number: NCT00977691

Lead Sponsor: National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary: Background:

Bone marrow transplantation (BMT), which involves transplanting a donor's marrow stem cells, is capable of curing some congenital anemias. BMT usually involves high-intensity treatment with chemotherapy and radiation to kill abnormal cells, which affects all systems of the body.

People with anemias often have damage to other organs such as the kidneys, which can be further damaged by the chemotherapy. Only approximately 20 percent of patients have a full-matched donor, making treatment for many people with anemias unavailable. However, 90 percent of patients may have a half-matched donor, but using a half-matched donor increases the toxicity of BMT.

Objectives:

To determine if a research BMT with half-matched donor cells, low-intensity radiation, immunosuppressant drugs, and no chemotherapy will be effective in patients with sickle cell disease and Beta-thalassemia.

To determine the effectiveness of cyclophosphamide, an immunosuppressant drug, in preventing rejection of the donor cells.

Eligibility:

Recipients are individuals at least 18 years of age who have been diagnosed with sickle cell disease and Beta-thalassemia, and who have a family member who is a haploidentical (i.e., half match) tissue match.

Donors are healthy individuals between the ages of 2 and 80 who are found to be suitable donors.

Design:

Donors will undergo apheresis, which involves withdrawing blood from one arm vein, passing it through a machine that removes bone marrow stem cells, and returning the remaining blood through the vein in the other arm. Donors will receive a drug that causes the stem cells to be released into the bloodstream prior to the apheresis procedure.

Recipients will undergo routine physical and laboratory examinations, including bone marrow sampling at the beginning of the study. After transplantation, physical and laboratory examinations will occur on a weekly or twice weekly basis at the outpatient clinic. Recipients will be examined every 6 months starting 100 days posttransplant for 5 years.

Recipients will receive low-dose radiation in two treatments 1 and 2 days before the transplant. They will also be given immunosuppressant therapy with alemtuzumab and sirolimus. Another immunosuppressant drug, cyclophosphamide, will be given in the future as needed to subsets of the recipients to prevent rejection of donor cells.

Recipients will receive the donor stem cells through a previously inserted central line. The process takes up to 8 hours.

Recipients will receive blood transfusions as necessary to prevent anemia and bleeding during the posttransplant period. They may also receive intravenous antibiotics to prevent infection.

Detailed Description: Nonmyeloablative allogeneic peripheral blood stem cell (PBSC) transplants are currently being investigated in phase I/II trials assessing engraftment, efficacy, and toxicity at a number of transplant centers. Our ongoing protocol for patients with severe congenital anemias, particularly sickle cell disease (SCD), and an HLA-matched sibling donor has had excellent preliminary results. None of the patients who engrafted had sickle-related events or any evidence of graft versus host disease (GVHD). There was no significant toxicity associated with the conditioning regimen.

Our main limitation has been a lack of HLA-matched sibling donors in the majority of patients. We performed a study in which patients with severe SCD who lacked a suitable donor underwent a search for a matched unrelated donor or umbilical cord donor. The vast majority of patients were not found to have an appropriate alternative donor. We therefore seek to develop a safe nonmyeloablative regimen to be applied to the haploidentical setting so that family members can serve as donors and greatly expand the donor pool.

In this protocol, we propose PBSC transplantation in patients with SCD and thalassemia, considered at high risk for complications from or ineligible for standard bone marrow transplantation, with allogeneic peripheral blood stem cells from a haploidentical donor using a novel immunosuppressive regimen without myeloablation in an attempt to further decrease the transplant-related morbidity/mortality. The low intensity nonmyeloablative conditioning regimen will consist of a relatively low radiation dose for therapeutic radiation, Alemtuzumab (Campath ), Sirolimus (Rapamune ), and Cyclophosphamide (Cytoxan ) as a strategy to provide adequate immunosuppression to allow sufficient engraftment for clinical remission with a lower risk of GVHD development. T-cell replete, donor-derived, granulocyte colony-stimulating factor (G-CSF)-mobilized PBSC will be used to establish hematopoietic and lymphoid reconstitution.

The primary endpoint of this study is the percentage of patients who have sustained donor type hemoglobin without significant GVHD for patients with SCD, or who are transfusion-independent and without significant GVHD for patients with thalassemia. Other endpoints include degree of donor-host chimerism necessary for long term graft survival and disease amelioration, incidence of acute and chronic GVHD, incidence of graft rejection, transplant-related morbidity, as well as disease-free and overall survival.

Recruitment & Eligibility

Status: ACTIVE_NOT_RECRUITING

Sex: All

Target Recruitment: 23

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Cohort 1	PBSC Transplant	PBSC transplant with no post-transplant cyclophosphamide (PT-Cy)
Cohort 1	Low Dose Irradiation	PBSC transplant with no post-transplant cyclophosphamide (PT-Cy)
Cohort 2	PBSC Transplant	PBSC transplant with 50 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 3	PBSC Transplant	PBSC transplant with 100 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 2	Low Dose Irradiation	PBSC transplant with 50 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 3	Low Dose Irradiation	PBSC transplant with 100 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 1	Alemtuzumab	PBSC transplant with no post-transplant cyclophosphamide (PT-Cy)
Cohort 1	Sirolimus	PBSC transplant with no post-transplant cyclophosphamide (PT-Cy)
Cohort 2	Alemtuzumab	PBSC transplant with 50 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 2	Sirolimus	PBSC transplant with 50 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 3	Alemtuzumab	PBSC transplant with 100 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 2	Cyclophosphamide	PBSC transplant with 50 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 3	Sirolimus	PBSC transplant with 100 mg/kg post-transplant cyclophosphamide (PT-Cy)
Cohort 3	Cyclophosphamide	PBSC transplant with 100 mg/kg post-transplant cyclophosphamide (PT-Cy)

Primary Outcome Measures

Name	Time	Method
Patients With Donor Type Hemoglobin	1 year	Percentage of patients post transplant with sustained donor type hemoglobin on hemoglobin electrophoresis

Secondary Outcome Measures

Name	Time	Method
Number of Participants With Disease-free Survival	Year 5	Number of participants with disease-free survival, as defined by: alive and free acute complications related to sickle cell disease.
Number of Stem Cell Transplant Participants That Experienced Rejection at Each Dose of Post-transplant Cyclophosphamide	Year 5	Number of stem cell transplant participants that experienced rejection at each dose of post-transplant cyclophosphamide. Determine whether post-transplant cyclophosphamide is required and will reduce the incidence and severity of regimen failure.
Number of Participants Who Develop Extensive GVHD	Year 5	Number of participants with extensive, Chronic Graft vs Host Disease (GVHD). Extensive chronic GVHD is defined as GVHD occurring after day 100 that did not meet the definition of limited chronic GVHD. Extensive disease presents either with generalized skin involvement, or with localized skin involvement or hepatic dysfunction plus at least one of the following: * Liver histology showing chronic progressive hepatitis, bridging necrosis, or cirrhosis * Involvement of the eye (Schirmer's test with less than 5 mm wetting) (see "Diagnosis and classification of Sjögren's syndrome") * Involvement of minor salivary glands or oral mucosa (as demonstrated on labial or mucosal biopsy specimen) * Involvement of any other target organ
Number of Participants Who Developed Acute GVHD Grades I, II, III, IV	Day100	Number of participants who developed Acute Graft vs Host Disease (GVHD) Grades I, II, III, IV as defined by CIMBTR criteria for Organ Stages of Acute GVHD. Grades are defined as: Grade I: Skin = Maculopapular rash\< 25% of body surface area (BSA); Liver = Total Bilirubin 2-3 mg/dL; Lower GI = stool output/day is 500-999 mL/day. Grade II: Skin = rash on 25-50 percent body surface area; Liver = Total Bilirubin 3.1-6.0 mg/dL; Lower GI = Diarrhea 1001-1500 mL/day. Grade III: Skin = Rash on \>50% of body surface; Liver = Total Bilirubin 6.1 - 15.0 mg/dL; Lower GI = Diarrhea \> 1500 mL/day. Grade IV: Skin = Generalized erythroderma plus bullous formation; Liver = Total Bilirubin \>15 mg/dL; Lower GI = Severe abdominal pain with or without ileus. Grade I GVHD is characterized as mild disease, grade II GVHD as moderate, grade III as severe, and grade IV life-threatening.
Chimeric Value That is Required to Maintain Graft Survival and Hematologic Normalcy.	Up to Year 5	Define the level of chimerism required to maintain graft survival and hematologic normalcy. Hematologic normalcy may be defined as: being free from sickle cell disease. The chimeric status of patients will be measured on days +14 (or when subject starts to engraft), +30, +60 and +100, and periodically after day +100, by microsatellite analysis of the peripheral blood. Engraftment of donor cells was assessed with the use of methods that detect informative polymorphisms in regions known to contain short tandem repeats. Peripheral-blood CD3+ T cells and CD14+CD15+ myeloid cells were selected for analysis with the use of immunomagnetic beads (Dynal).
Number of Participants Who Developed Limited Chronic GVHD	Year 5	Number of incidences of participants who developed Limited Chronic Graft vs Host Disease (GVHD). Limited disease is characterized by localized skin involvement and/or evidence of hepatic dysfunction. Limited disease is associated with a favorable outcome without systemic therapy, while extensive disease patients have an unfavorable outcome.
Number of Participants Overall Survival	Up to Year 5	Number of participants overall survival by year 5
Number of Participants That Experienced a Transplant-related Mortality	Year 1	Number of participants that experienced a transplant related mortality, as defined as death from causes other than relapse (GVHD, toxicity, infection, other and unknown causes).
Number of Participants With Graft Failure	Up to Year 5	Number of participants with graft failure by year 5. Graft failure is defined by return of sickle cell disease.
Participants Who Engrafted or Rejected and Type of Haploidentical Donors	Up to Year 5	Determine whether specific haploidentical donors (i.e. parent versus sibling versus child) will decrease the incidence of regimen failure