Br J Cancer:Olaparib奥拉帕尼联合半胸放疗提高肺癌的治疗指数

2021-03-24 xiaozeng MedSci原创

放疗是包括肺癌在内的许多癌症的一个重要的局部疗法。

放疗是包括肺癌在内的许多癌症的一个重要的局部疗法。然而,由于剂量限制性毒性,期抗肿瘤疗效仍然欠佳。因此,迫切需要制定能够增加抗肿瘤作用并不增加正常组织毒性的提高放疗效果的相关药物。

辐射产生的活性氧会破坏DNA,主要引起单链断裂(SSB),如果不进行修复,则最终会导致致命的双链断裂事件发生。既往研究显示,PARP-1能够检测辐射诱导的DNA SSB作用,并募集DNA修复蛋白以修复受损的DNA。

目前PARP抑制剂olaparib(奥拉帕尼)已表现出了在包括肺癌、乳腺癌、前列腺癌和结肠癌在内的多种临床前肿瘤模型中增强放疗效果的作用。

然而,其与放疗的联合作用对于正常组织的影响目前尚未得到很好的研究。该研究旨在尿烷(urethane)诱发的小鼠肺癌模型中探究奥拉帕尼联合半胸放疗的治疗指数。

奥拉帕尼联合全胸放疗会导致正常组织毒性

研究人员通过对A/J 小鼠进行奥拉帕尼联合全胸放疗并监测体重变化,以评估耐受性,并通过组织学评估对正常组织的影响。在抗肿瘤(干预)研究中,通过注射尿烷诱发肺部肿瘤,随后在第8周(早期干预)和18周(后期干预)分别接受奥拉帕尼、单左胸放疗以及奥拉帕尼联合左胸放疗进行治疗。通过目测、核磁共振成像和组织学评估上述治疗的抗肿瘤功效和对正常组织的影响。

奥拉帕尼联合半胸放疗的早期干预可抑制肺癌的发展

结果显示,当奥拉帕尼联合全胸放疗而非半胸放疗时,研究人员观察到了体重减轻和食道毒性的增加。在早期和晚期干预研究中,奥拉帕尼均可提高半胸放疗的抗肿瘤作用,且不会增加肺毒性。


总而言之,该研究结果揭示了,在肺癌小鼠模型中奥拉帕尼能够提高半胸放疗的治疗指数


原始出处:

Jiang, Y., Martin, J., Alkadhimi, M. et al. Olaparib increases the therapeutic index of hemithoracic irradiation compared with hemithoracic irradiation alone in a mouse lung cancer model. Br J Cancer (19 March 2021).

 

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    2021-10-03 LSJ122
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    2021-04-16 thy817

    学习了

    0

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    2022-02-18 刘阔
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    2021-03-25 科研科研科研

    奥拉帕尼联合放疗提高肺癌治疗指数

    0

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    2021-03-24 奇葩豆

    赞一个

    0

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    2021-03-24 1e0be48em91(暂无匿称)

    学习

    0

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