| Project/Area Number |
17590786
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
HASEGAWA Yoshinori UNIVERSITY HOSPITAL, ASSOCIATE PROFESSOR, 医学部附属病院, 講師 (20270986)
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| Co-Investigator(Kenkyū-buntansha) |
IMAIZUMI Kazuyoshi UNIVERSITY HOSPITAL, ASSOCIATE PROFESSOR, 医学部附属病院, 講師 (50362257)
KAWABE Tsutomu NAGOYA UNIVERSITY, SCHOOL OF MEDICINE, RESEARCH ASSOCIATE, 医学部, 助手 (20378219)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Irinotecan / ABC transporters / gene polymorphisms / ABCC2 / OATP-C / UGT1A1^*28 / UGT1A1*28 / ABCG2 |
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| Research Abstract |
Irinotecan unexpectedly causes severe, occasionally fatal, toxicity of leukopenia or diarrhea. Adenosine triphosphate-binding cassette transporters (ABCC2) transport irinotecan and its metabolites from hepatocytes to the bile. We assessed whether variant forms of ABCC2 would affect inter-patient variations in sensitivity to irinotecan toxicity in 120 Japanese patients with a cancer. The genotyping of ABCC2 was performed by direct sequencing of the PCR fragment. We found five polymorphisms in ABCC2. ABCC2 2375A>G is a new polymorphism, substituting aspartic acid for glycine. Univariate logistic regression analysis found no significant association between severe toxicities and carrying at ABCC2 polymorphisms. The results suggested that the determination of nucleic polymorphisms of ABCC2 would not be useful for predicting severe toxicities by irinotecan. On the other hand, organic anion transporting polypeptide C (OATP-C) plays a major role in the transport of SN-38 from portal venous blood to hepartocytes. The allele frequencies of OATP-C^*1 a, OATP-C^*1b, and OATP-C^*15 were 0.31, 0.58, and 0.11, respectively. Logistic regression analysis did not show any significant association between the occurrence of severe toxicity and carrying OATP-C^*15. The double variants for OATP-C^*15 and UGT1A1 ^*28 tended to be associated with the occurrence of severe toxicity, although it was not statistically significant.
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