@misc{oai:repo.qst.go.jp:00070891, author = {Hirakawa, Hirokazu and Hirayama, Ryoichi and Fujimori, Akira and Okayasu, Ryuichi and et.al and 平川 博一 and 平山 亮一 and 藤森 亮 and 岡安 隆一}, month = {Sep}, note = {17AAG, an Hsp90 inhibitor was shown to radiosensitize certain human tumor cells exposed to X-rays, while this sensitization was not clearly observed in normal human cells. The mechanism of this was suggested to come from inhibition of DNA double strand break (DSB) repair, particularly impairment of homologous recombination repair (HRR) pathway by this drug (Noguchi et al 2006). We also used mouse xenograft model to examine the combined effect of 17AAG and high LET carbon irradiation. For this purpose, SQ5 human lung tumor cells were implanted on the leg of nude mice and the tumor growth was observed in the combined treatment as compared with radiation or drug treatment alone. Our preliminary results indicate that tumor growth was more inhibited in the 17AAG and carbon irradiation than carbon or 17AAG treatment alone. These data suggest that an effective tumor control might be obtained by combining an HRR inhibitor with high LET carbon irradiation., 日本放射線影響学会第55回大会}, title = {Radiosensitization by inhibition of homologous recombination repair combined with high LET heavy ion irradiation}, year = {2012} }