ASCO-2021速递:光谱MRI可指导胶质母细胞瘤放疗,安全有效

2021-06-07 Freeman MedSci原创

ASCO-2021速递-光谱MRI可指导胶质细胞瘤放疗,安全有效

胶质母细胞瘤(GBM)是最常见的成人原发性恶性脑瘤。尽管放疗(RT)达到60Gy和替莫唑胺(TMZ)可缓解病情,但这些病人的结果很差[中位总生存期(OS)大约16个月]。

磁共振波谱(MRS)测量大脑中特定代谢物的水平,包括胆碱(Cho)和N-乙酰天门冬氨酸(NAA)。以前,他们发现高的Cho/NAA比率可以帮助定位GBM复发的高风险大脑区域,而这些区域在标准的对比度增强(CE)MRI上可能无法被发现。基于这一发现,他们进行了一项临床试验,以评估使用高级的体积量化MRS技术,即光谱MRI(sMRI)来指导新诊断的GBMs的RT剂量升级的可行性和安全性。

他们于2017年5月至2019年4月在3个机构(Emory U、U Miami、Johns Hopkins U)招募患者。纳入标准包括新诊断的GBM患者,年龄≥18岁,肿瘤部位可通过sMRI充分成像。

Cho/NAA比值与对侧正常出现的白质(NAWM)进行归一。对于RT计划,根据T2-FLAIR和T1 CE MRIs去定义标准的总肿瘤体积(GTV1和2),并加上5毫米的边缘以产生临床肿瘤体积(CTV1和2)。

GTV3(=CTV3,sMRI定义)是由CE残余肿瘤和Cho/NAA≥2倍NAWM联合产生。为了保持有效性,CTV3需要≤65毫升。

规划靶区(PTVs)是通过在CTVs周围应用3毫米的边缘而产生的。在PTV1、PTV2和PTV3中分别使用50.1、60和75Gy的30次分量(fraction)。所有患者同时接受标准的TMZ/辅助治疗。生存曲线是用Kaplan-Meier方法生成的。毒性评估根据CTCAE v4.0进行。

共有30名患者符合资格并接受了研究治疗。平均/中位年龄为56.4/58.9岁。9名患者(30%)为MGMT甲基化;2名患者(6.7%)有IDH1突变。

剔除的患者中位随访时间为21.4个月,中位OS为23.0个月。30名患者中,有11人被记录为经历了3级或更大的毒性,至少可能是由于他们的治疗造成。

在治疗后9个月的7名患者中,大多数可归因于TMZ(血小板减少症×4,血小板/中性粒细胞减少症×1,转氨酶×1),只有一个病例(头痛/疲劳×1)可能归因于RT。


这个研究的重要意义在于,sMRI的指导下,剂量递增的RT达到75Gy,对于新诊断的GBMs患者来说似乎是可行和安全的。OS结果也是相当有希望的。

原文出处:

Hui-Kuo George Shu, Eric Albert Mellon, Lawrence Kleinberg, Saumya S Gurbani, Karthik K Ramesh, Mohammed Goryawala, Sulaiman Ahmed Sheriff, Vicki Huang, Peter B Barker, Andrew Maudsley, Eduard Schreibmann, Brent D Weinberg, Hyunsuk Shim; Department of Radiation Oncology, Winship Cancer Institute of Emory University, Atlanta, GA; University of Miami Miller School of Medicine, Miami, FL; Johns Hopkins University School of Medicine, Baltimore, MD; Emory University School of Medicine, Atlanta, GA; Emory University, Winship Cancer Institute, Atlanta, GA
J Clin Oncol 39, 2021 (suppl 15; abstr 2018)
10.1200/JCO.2021.39.15\_suppl.2018

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    2021-12-29 quxin068
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    2021-06-07 81252974

    学习了

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1939203, encodeId=23ce19392033d, content=<a href='/topic/show?id=1c292818fd' target=_blank style='color:#2F92EE;'>#ASC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2818, encryptionId=1c292818fd, topicName=ASC)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=74808, createdName=quxin068, createdTime=Wed Dec 29 22:01:03 CST 2021, time=2021-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2052951, encodeId=e1ee205295156, content=<a href='/topic/show?id=ae848406335' target=_blank style='color:#2F92EE;'>#胶质母细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=84063, encryptionId=ae848406335, topicName=胶质母细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a691420, createdName=30397604, createdTime=Mon Jul 19 08:01:03 CST 2021, time=2021-07-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1772391, encodeId=cc9a1e72391bc, content=<a href='/topic/show?id=c38963544cc' target=_blank style='color:#2F92EE;'>#母细胞瘤#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=63544, encryptionId=c38963544cc, topicName=母细胞瘤)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b07438375157, createdName=huperzia, createdTime=Tue Apr 05 10:01:03 CST 2022, time=2022-04-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1476130, encodeId=d50314e61307e, content=<a href='/topic/show?id=2bcee797732' target=_blank style='color:#2F92EE;'>#细胞瘤#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=77977, encryptionId=2bcee797732, topicName=细胞瘤)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=bf5e7252474, createdName=spoonycyy, createdTime=Tue Jun 08 21:01:03 CST 2021, time=2021-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=971646, encodeId=bf6e9e16460c, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2d612028636, createdName=81252974, createdTime=Mon Jun 07 22:15:13 CST 2021, time=2021-06-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=971443, encodeId=2aef9e144347, content=很好的研究!, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200529/3611e9bb629c4e5b81fbd8ce784b06cc/128487eae357460bb98f67d86230c218.jpg, createdBy=ab235268530, createdName=神盾医疗局局长Jack, createdTime=Mon Jun 07 09:04:37 CST 2021, time=2021-06-07, status=1, ipAttribution=)]
    2021-06-07 神盾医疗局局长Jack

    很好的研究!

    0

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