OBJECTIVES:
Primary
* To compare the amount of substance P in serum samples from patients with cancer treated with busulfan/cyclophosphamide or cyclophosphamide/total body irradiation conditioning regimens prior to undergoing allogeneic hematopoietic stem cell transplantation.
Secondary
* To assess the changes in substance P over time to see if there is an optimal time shown by this physiologic correlate to discontinue substance P blockade after the chemotherapy regimen is completed in these patients.
OUTLINE: Previously collected serum samples are analyzed by enzyme immunoassay for changes in substance P levels.
Patients' medical records are reviewed for demographic information, past history, and course of treatment.
