SCD-Haplo: Phase II Study of HLA-Haploidentical SCT for Aggressive SCD

Related donor stem cell transplantation using the alemtuzumab/ TBI platform has been shown to be a safe strategy to cure severe sickle cell disease. However, due to a lack of suitable donors, many patients cannot benefit from this strategy. Alternative donor sources are desperately needed to fill this gap. Nearly all patients will have a haploidentical family member who would be able to donate. The use of post transplantation cyclophosphamide has greatly improved the outcome of haploidentical stem cell transplantation. The investigators propose to combine this with alemtuzumab/TBI conditioning.

Sickle cell anemia is an inherited form of anemia, a condition in which there aren't enough healthy red blood cells to carry adequate oxygen throughout the body. These patients are at increased risk of death, stroke, frequent pain crises, acute chest syndrome as well as chronic conditions including: lung damage, retinopathy, kidney damage, leg ulcers, and pulmonary hypertension.

There's no cure for most people with sickle cell anemia. However, treatments can relieve pain and help prevent co-morbid conditions associated with sickle cell anemia. Hydroxyurea is the only FDA approved drug to help alleviate symptoms associated with sickle cell disease. The mortality rate is still high in patients using hydroxyurea and a significant percentage of patients still have aggressive disease despite the hydroxyurea treatment. Hydroxyurea therapy also does not seem to prevent the development of many of the complications of sickle cell disease such as pulmonary hypertension.

Historically, stem cell transplantation in sickle cell disease was mainly done in the pediatric population. The options were more limited for adults with sickle cell disease with aggressive disease despite hydroxyurea. Most rely on chronic red blood cell transfusions which carry significant risks of infection, iron overload, and alloimmunization. Alloimmunization refers to the production of antibodies which occurs in up to 50% of patients with sickle cell disease who are on chronic transfusion therapy making further transfusions difficult with a high potential for hemolytic transfusion reactions.

Recently the use of a non-myeloablative stem cell transplantation regimen (relying on immunotherapy instead of chemotherapy) for sickle cell disease in adults showed 88% engraftment rates (30 out of 34 patients) with no GVHD and 0% mortality. However, these transplants used only fully HLA-matched siblings, which are unavailable to all but approximately 14-28% of patients who could benefit from such a transplant at UIC.

A recent study at Johns Hopkins carried out a similar haploidentical (half matched) transplant with 14 sickle cell patients who lacked fully HLA-matched donors. Approximately two years following transplant, 57% of patients successfully engrafted (8 or 14 patients). There were no deaths and only one episode of acute GVHD of the skin which resolved without therapy.

The investigators plan to offer stem cell transplantation to sickle cell patients with aggressive disease who only have a partially matched HLA sibling donor. Haploidentical transplants are considered only for patients with no other standard options available who would normally be treated with supportive (palliative) care or given the option to participate in a clinical trial. Donors who are HLA-haploidentical will be the source of hematopoietic stem cells. Potential donors can include any relative (e.g. parents, offspring, siblings, cousins, aunts/uncles, grandparents).

The related donor stem cell transplantation using the alemtuzumab/TBI platform has been shown to be a safe strategy to cure severe sickle cell disease. However, due to a lack of suitable donors, many patients cannot benefit from this strategy. Alternative donor sources are desperately needed to fill this gap. Nearly all patients will have a haploidentical family member who would be able to donate. The use of post transplantation cyclophosphamide has greatly improved the outcome of haploidentical stem cell transplantation. The investigators propose to combine this with alemtuzumab/TBI conditioning.

The investigational component of this study is the combination of the Alemtuzumab (immunotherapy) and Total Body Irradiation conditioning regimen and the HLA Haploidentical Transplant with post-transplant Cyclophosphamide. Investigators plan to study the engraftment rates (transplant success rates) at Day 60 in sickle cell patients undergoing an HLA haploidentical stem cell transplant with post transplant high dose cyclophosphamide.

Eligibility Criteria:
Patient Eligibility:

* Patients with sickle cell disease are eligible if they have any of the following complications:

  * Stroke or central nervous system event lasting longer than 24 hours
  * Frequent vaso-occlusive pain episodes, defined as ≥ 3 per year requiring emergency room, acute care center, or hospital admissions.
  * Recurrent episodes of priapism, defined as ≥ 2 per year requiring emergency room visits
  * Acute chest syndrome with recurrent hospitalizations, defined as ≥ 2 lifetime events
  * Red-cell alloimmunization (≥ 2 antibodies) during long-term transfusion therapy
  * Bilateral proliferative retinopathy with major visual impairment in at least one eye
  * Osteonecrosis of 2 or more joints
  * Sickle cell nephropathy, defined by a GFR \< 90mL/min/1.73m2 or the presence of macroalbuminuria (urine albumin \> 300 mg/g creatinine)
  * Pulmonary hypertension, defined by a mean pulmonary artery pressure \> 25mmHg
* Age 16-60 years
* Karnofsky performance status of 60 or higher
* Adequate cardiac function, defined as left ventricular ejection fraction ≥ 40%
* Adequate pulmonary function, defined as diffusion lung capacity of carbon monoxide ≥ 50% predicted (after adjustment for hemoglobin concentration)
* Estimated GFR ≥ 50mL/min as calculated by the modified MDRD equation
* ALT ≤ 3x upper limit of normal
* HIV-negative
* Patient is pregnant
* Patient is able and willing to sign informed consent
* Patient has an HLA-haploidentical relative