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.: Home > International Journal of Medical Sciences > 2010 > Volume 7 Number 2 > Miwako Narita1, Masayoshi Masuko2, Tohri Kurasaki3, Toshiki Kitajima3, Shoko Takenouchi3, Anri Saitoh1, Norihiro Watanabe1, Tatsuo Furukawa2, Ken Toba3, Ichiro Fuse4, Yoshifusa Aizawa3, Manabu Kawakami5, Yoshihiro Oka6, Haruo Sugiyama6 and Masuhiro Takahashi1

WT1 PEPTIDE VACCINATION IN COMBINATION WITH IMATINIB THERAPY FOR A PATIENT WITH CML IN THE CHRONIC PHASE

Miwako Narita1, Masayoshi Masuko2, Tohri Kurasaki3, Toshiki Kitajima3, Shoko Takenouchi3, Anri Saitoh1, Norihiro Watanabe1, Tatsuo Furukawa2, Ken Toba3, Ichiro Fuse4, Yoshifusa Aizawa3, Manabu Kawakami5, Yoshihiro Oka6, Haruo Sugiyama6 and Masuhiro Takahashi1
1. Laboratory of Hematology and Oncology, Graduate School of Health Sciences, Niigata University, Niigata, Japan 2. Division of Stem Cell Transplantation, Niigata University Medical and Dental General Hospital, Niigata, Japan 3. Division of Hematology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan 4. Division of Bioscience Medical Research Center, Niigata University Medical and Dental General Hospital, Niigata, Japan 5. Department of Medicine, National Hospital Organization, Osaka Minami Medical Center, Osaka, Japan 6. Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, Osaka, Japan
Abstract :

Although tyrosine kinase inhibitors is effective for dramatically reducing CML cells, it might be difficult to eradicate completely the CML stem cells. We aimed to clarify the safety and effects of WT1 peptide vaccination in combination with imatinib therapy for a CML patient. A 51 year-old male with CML in CP, who showed a resistance against imatinib therapy for 2.5 years, began to be treated with 9mer modified-type WT1 peptides in combination with standard dose of imatinib. Although every 2-week-administration of WT1 peptides for 22 weeks did not show definite effects on the quantification ofbcr-abl transcripts, by changing the administration from every 2 weeks to 4 weeks bcr-abl transcripts decreased remarkably. After 11 months of every 4-week-administration of the peptides and 12 months post cessation of the peptides bcr-abl transcripts achieved to the level below detection by RQ/RT-PCR (complete molecular response). WT1/MHC tetramer+CD8+ CTLs, which appeared after the second administration of WT1 peptides and remained more than 15 in number among 106 CD8+ T cells throughout the administration of WT1 peptides, are still present in the blood on 14th month post cessation of the peptides. An in vitro study as to the cytotoxicity of lymphocytes induced by mixed lymphocyte peptide culture demonstrated that cultured lymphocytes possessed cytotoxicity against WT1 expressing leukemia cells and the cytotoxicity was
WT1-specific and MHC class I restricted. The present study showed that WT1 peptide vaccination in combination with TKI is feasible and effective in the therapy for imatinib- resistant CML.

Keywords :
WT1 peptide vaccination, CML, imatinib, bcr-abl transcripts, WT1 tetramer, cytotoxicity

Date Deposited : 27 Jul 2011 09:28

Last Modified : 27 Jul 2011 09:28

Official URL: http://www.medsci.org/archive

Volume 7, Number 2, - 2010 , ISSN 1449-1907

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