OBJECTIVES: I. Determine the maximum tolerated dose of decitabine in patients with relapse post allogenic bone marrow transplant. II. Determine the toxicity of decitabine combined with filgrastim (G-CSF) primed allogeneic peripheral blood stem cells in patients who relapsed within 1 year after allogeneic bone marrow transplantation. III. Determine the effectiveness in reinducing remission in these patients.