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Abstract
Immunotherapy using a Wilms tumor (WT1) peptide has been undergoing clinical trials for adulthood leukemia and solid cancer with promising results. In this study, the authors used WT1 peptide vaccination to treat a 6-year-old girl with metastatic alveolar rhabdomyosarcoma. She received weekly intradermal injection with HLA-A*2404-restricted, 9-mer WT1 peptide against residual bone disease. After 3 months her bone disease disappeared, concurrent with an increase in the frequency of WT1-specific cytotoxic T lymphocytes (CTLs). A high proportion of WT1-specific CTLs with effector or effector memory phenotype were detected in peripheral blood of this patient. She is currently still on continued WT1 peptide immunotherapy in a disease-free condition for 22 months. WT1 peptide-based immunotherapy should be a promising option for high-risk rhabdomyosarcoma in childhood.