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Cancer Cell:还在质疑高剂量维C抗癌?人体安全试验已通过

2017-04-02 佚名 转化医学网

临床试验发现,定期给脑癌和肺癌患者注射800-1000倍日常服用量的维生素C作为改进常规癌症治疗效果的策略是安全的。在2017年3月30日提交的癌细胞研究工作报告中,爱荷华大学的研究人员展示了一令人惊讶的研究成果:改变癌细胞的铁代谢途径,导致癌细胞对高剂量维生素C引起的死亡敏感性增加。


临床试验发现,定期给脑癌和肺癌患者注射800-1000倍日常服用量的维生素C作为改进常规癌症治疗效果的策略是安全的。在2017年3月30日提交的癌细胞研究工作报告中,爱荷华大学的研究人员展示了一令人惊讶的研究成果:改变癌细胞的铁代谢途径,导致癌细胞对高剂量维生素C引起的死亡敏感性增加。

首次提出癌细胞易受氧化还原活性复合物影响假说的作者Garry Buettner说:“这篇文章揭示了癌细胞代谢的脆弱性,使我们能够利用现有的氧化还原活性化合物,如维生素C,使癌细胞对辐射和化疗变得更加敏感。”Buettner以及资深作家Bryan Allen和Douglas Spitz是爱荷华大学辐射肿瘤学系的教员。

在这项研究中,参加安全性试验的11名脑癌患者每周接受三次维生素C注射,注射持续2个月,随后每周接受两次维生素C注射,持续7个月,同时接受常规辐射和化疗治疗。与大多数成年人血液内70μM的维生素C含量相比,研究人员每次向患者体内注入维生素C的浓度高达20,000μM。 研究人员指出,高剂量的维生素C是必需的,因为维生素C在体内的循环仅有两个小时的半衰期。 维生素C治疗伴有轻微的副作用,如口干。

为什么这种方法安全?因为即使高剂量,维生素C对正常细胞也无毒性。同时爱荷华大学的研究小组发现,肿瘤组织内高水平的氧化还原活性铁分子(线粒体代谢异常的副产物)与维生素C反应形成过氧化氢和过氧化氢自由基。 这些自由基可以在癌细胞(相对于正常细胞)中选择性损伤DNA,导致癌细胞死亡以及癌细胞对辐射和化疗的敏感性增加。

生物化学研究学者Douglas Spit表示:“这是一个重要的例子,表明癌症以及正常细胞中氧化还原活性复合物的基础科学研究在临床上可用于癌症治疗。这项研究提出了令人信服的证据证实,癌细胞中增加的氧化还原活性金属离子是导致癌细胞对高剂量维生素C敏感的根本原因。”

研究为进一步确定高剂量维生素C是否有效延长患者接受放疗和化疗的总体寿命和生活质量,设置了II期临床试验。目前,研究人员正在招募肺癌患者,并将在II期试验中继续招募多形性胶质母细胞瘤(脑癌)患者。他们希望在II期试验中可以增强脑癌患者对放疗和化疗的反应。 这种保守的乐观是基于I期试验数据,I期试验数据显示11名脑癌患者(18-22个月)的总生存期增加4-6个月,而标准治疗通常仅有14-16个月的存活时间。

研究领导者Bryan Allen说:“我们合作的大多数癌症患者都很乐意参与临床试验,临床试验结果看起来很有希望,但我们不知道这种方法是否真的改善了治疗反应,直到我们完成II期试验。”

每个患者在II期试验中维生素C注射的费用约为8000美元。这种成本低于一些免疫治疗或化疗药物治疗。

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    2023-12-13 ms6000002079940939 来自广东省

    感谢分享

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    2018-02-17 维他命
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    2017-07-16 saikp
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  5. [GetPortalCommentsPageByObjectIdResponse(id=2174667, encodeId=8ad121e466736, content=感谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=de549106593, createdName=ms6000002079940939, createdTime=Wed Dec 13 10:16:37 CST 2023, time=2023-12-13, status=1, ipAttribution=广东省), GetPortalCommentsPageByObjectIdResponse(id=1960103, encodeId=84b31960103f2, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sat Feb 17 12:25:00 CST 2018, time=2018-02-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1735098, encodeId=a3441e350985d, content=<a href='/topic/show?id=9aa5923e176' target=_blank style='color:#2F92EE;'>#质疑#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=92371, encryptionId=9aa5923e176, topicName=质疑)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=2d3033872914, createdName=saikp, createdTime=Sun Jul 16 19:25:00 CST 2017, time=2017-07-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869844, encodeId=deb11869844b1, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Fri Oct 27 19:25:00 CST 2017, time=2017-10-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1942059, encodeId=5675194205907, content=<a href='/topic/show?id=065b1022341a' target=_blank style='color:#2F92EE;'>#高剂量#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=102234, encryptionId=065b1022341a, topicName=高剂量)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=010d202, createdName=amy0550, createdTime=Sat Sep 09 21:25:00 CST 2017, time=2017-09-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1822226, encodeId=6e191822226d0, content=<a href='/topic/show?id=e39010223eef' target=_blank style='color:#2F92EE;'>#高剂量维C#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=102237, encryptionId=e39010223eef, topicName=高剂量维C)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f00658, createdName=yyanpro@21cn.c, createdTime=Sat Dec 30 09:25:00 CST 2017, time=2017-12-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1780712, encodeId=649f1e80712a8, content=<a href='/topic/show?id=517a4016ac' target=_blank style='color:#2F92EE;'>#cancer cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4016, encryptionId=517a4016ac, topicName=cancer cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=96f62500201, createdName=12498e67m28暂无昵称, createdTime=Sat Apr 22 03:25:00 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=184906, encodeId=d25d18490686, content=学习了,多谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=93, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6KcicAVC1MwuOWcPEsEP4FrvDcicue5V6rMkmXmY73KjYP59vQrEdjU89iaN4ZkOhsItlHkmGTjhV3b5S3zOQA4E0/0, createdBy=cc261682151, createdName=卡圣, createdTime=Mon Apr 03 16:51:08 CST 2017, time=2017-04-03, status=1, ipAttribution=)]
    2017-09-09 amy0550
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    2017-04-03 卡圣

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