 RATIONALE: Giving low doses of chemotherapy, such as fludarabine, and radiation therapy before a donor peripheral blood stem cell transplant helps stop the growth of cancer cells. It also stops the patients immune system from rejecting the donors stem cells. The donated stem cells may replace the patients immune system and help destroy any remaining cancer cells graft-versus-tumor effect. Giving an infusion of the donors T cells donor lymphocyte infusion or interferon alfa after the transplant may help increase this effect. Sometimes the transplanted cells from a donor can also make an immune response against the bodys normal cells. Giving cyclosporine and mycophenolate mofetil after the transplant may stop this from happening. 