Clinical and Biological Predictors of Therapy-Related Leukemia

OBJECTIVES:

• Identify genetically susceptible patients to therapy-induced myelodysplastic syndrome or acute myelogenous leukemia (t-MDS/AML) prior to initiation of high-dose chemotherapy for sarcoma.
• Identify patients who are at increased risk of t-MDS/AML during or after therapy.

OUTLINE: Blood is collected from patients at diagnosis (preferably before chemotherapy or transfusion), at end of therapy, and at 6 months, 1 year, 2 years, and 3 years after therapy.

Blood specimens are examined by clonality analysis (HUMARA), variant cell frequency (glycophorin A assay), GST NAT2/CYP1A1 genotyping, microsatellite instability, and ras mutation detection (single strand conformation polymorphism and sequencing of mutant alleles).

Patients do not receive the results of the genetic testing and the results do not influence the type or duration of treatment.