Allogeneic Breast Protocol 1: T-Cell Depleted Allogeneic Blood Stem Cell Transplantation Using an Immunoablative Conditioning Regimen in Metastatic Breast Cancer

OBJECTIVES:

• Determine the ability of T-cell-depleted allogeneic blood stem cell transplantation after an immunoablative conditioning regimen to induce a state of mixed host/donor chimerism in patients with metastatic breast cancer.
• Determine the ability of this treatment regimen to induce an allogeneic graft-versus-tumor response in these patients.
• Determine the feasibility of giving other approved therapies to these patients at the first sign of disease progression in order to stabilize or produce a minimal or partial response.

OUTLINE: Patients receive chemotherapy comprising fludarabine IV over 30 minutes and cyclophosphamide IV over 1 hour on days 1-4. Patients receive filgrastim (G-CSF) SC daily beginning on day 5 and continuing until blood counts recover. Treatment repeats every 21 days for a maximum of 2 courses.

Patients receive a transplantation preparative regimen comprising fludarabine IV over 30 minutes and cyclophosphamide IV over 2 hours on days -6 to -3 (beginning on day 22 of immune-depleting chemotherapy) followed by allogeneic peripheral blood stem cell transplantation IV on day 0. Patients receive G-CSF SC daily beginning on day 0 and continuing until blood counts recover, plus cyclosporine IV over 1-2 hours every 12 hours on days -1 to 14 and then orally until day 40.

Patients with persistent malignant disease and less than grade II acute graft-versus-host disease receive donor lymphocytes IV on days 42, 70, and 98.