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- W2060191954 abstract "Abstract Background and Aims: Recent studies have shown that local radiotherapy can be an effective component of the treatment for hepatocellular carcinoma. To further improve therapeutic efficacy, use of drugs that can beneficially interact with radiation has been suggested. The purpose of this study was to identify drugs that can enhance radioresponse of murine hepatocarcinoma. Methods: C3H/HeJ mice bearing 8 mm tumors of murine hepatocarcinoma, HCa‐I, were treated with 25 Gy radiation and one of the following drugs: 5‐Fu, 150 mg/kg; adriamycin, 8 mg/kg; cisplatin, 6 mg/kg; paclitaxel, 40 mg/kg; and gemcitabine, 50 mg/kg. Tumor response to the treatment was determined by the use of a tumor growth delay assay and by an enhancement factor. The apoptotic level was assessed in tissue sections. The expression of regulating molecules was analyzed by using western blotting for p53, Bcl‐2, Bax, Bcl‐XL, Bcl‐XS, and p21 WAF1 / CIP1 . Results: Among the drugs tested, only gemcitabine enhanced the antitumor effect of radiation, with an enhancement factor of 1.6. The induction of apoptosis by a combination of gemcitabine and radiation was shown as only an additive level. In the analysis of radiation‐induced expression of regulating molecules, the most significant change by combining gemcitabine with radiation was the activation of p21 WAF1 / CIP1 . Conclusion: Gemcitabine is the first to show an enhancement of radioresponse of murine hepatocarcinoma when combined with radiation. The key element of enhancement is thought to be p21 WAF1 / CIP1 ." @default.
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- W2060191954 date "2001-08-01" @default.
- W2060191954 modified "2023-10-16" @default.
- W2060191954 title "Enhancement of tumor radioresponse by combined chemotherapy in murine hepatocarcinoma1" @default.
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- W2060191954 doi "https://doi.org/10.1046/j.1440-1746.2001.02533.x" @default.
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