Trial Information

Phase II Trial of Allogeneic T-Cell Depleted Hematopoietic Stem Cell Transplants From HLA Compatible, Related and Unrelated Donors After a Myeloablative Preparative Regimen With Hyperfractionated TBI, Thiotepa and Fludarabine For Treatment of Adult Patients (>18 Years) With Lymphohematopoietic Disorders

The purpose of this study is: (1) to try to kill any cancer or precancer cells that are in
your body, and to reduce the side effects of a transplant, which we have seen in our
previous studies, (2) to see if this treatment with a new recipe of radiation and
chemotherapy can suppress your immune system enough for the stem cells to 'take' and grow,
(3) to see if the specially prepared stem cells can grow in you without a problem called
graft-versus-host disease (GvHD) occurring.

One of the major side effects of any stem cell transplant is a condition known as graft vs.
host disease or GVHD. GVHD is an immune reaction caused by certain cells from the
transplanted stem cells called T-lymphocytes (or T-cells). The T-cells from your donor may
see your organs as foreign and attack them. New ways to remove the T-cells from the stem
cells before the transplant are being used to try and prevent GVHD. In some studies, the
removal of T-cells from the stem cells has been successful for many patients in preventing
both short-term (acute) and long-term (chronic) forms of GVHD. However, the removal of
T-cells may increase the chance that the new bone marrow developing from the stem cells will
be rejected or will not function well. Rejection of the transplant means that some of your
own cells have survived the chemo and radiation therapy, and are attacking the new bone
marrow cells. This condition can be lifethreatening because of an increased risk of
infections and bleeding and would require your getting more treatment and additional stem
cells. Studies like this one are designed to find better ways to avoid GVHD without
increasing the risk of other problems such as graft rejection.