| Project/Area Number |
24591184
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | Miyagi Prefectural Hospital Organization Miyagi Cancer Center |
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Principal Investigator |
MAEMODNO MAKOTO 地方独立行政法人宮城県立病院機構宮城県立がんセンター(研究所), がん先進治療開発研究部, 特任研究員 (40344676)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Nobuyuki 地方独立法人宮城県立病院機構宮城県立がんセンター(研究所), がん先進治療開発研究部, 部長 (60280872)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 癌 / 非小細胞肺癌 / 治療法 / 肺癌 / EGFR-TKI / EGFR |
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| Outline of Final Research Achievements |
TKIs are effective for NSCLC patients with EGFR-activating mutations. However, these patients eventually develop resistance, most frequently by T790M mutation. Combining a second-generation TKI with an anti-EGFR monoclonal antibody has been shown to improve clinical outcomes, although the mechanism remains elusive. To investigate this mechanism, we used EGFR-negative K562 cells. Double-mutant EGFRs were moderately sensitive to afatinib, but minimally affected by cetuximab. Combining afatinib and cetuximab synergistically increased cytotoxity for K562 cells carrying double-mutant EGFRs. Apoptosis in these cells was preceded by induction of BIM and activation of Caspase-3 and PARP. Afatinib induced EGFR recycling to the cell surface, leading to the cetuximab-mediated recognition and subsequent degradation. These results suggest that the synergistic effect exerted by afatinib and cetuximab against NSCLCs has a potential in the future clinical application.
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