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分子影像学:一场悄然发生的医疗革命

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发表于 2020-10-21 13:57:16 | 显示全部楼层 |阅读模式

                    

                    

                    
                    
                    <p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;"><img src="http://mmbiz.qpic.cn/mmbiz/uwD6icYMd8CdPvkFkiblghjjWUpcltNQViaNczNVUSUrFe0lCpCic3TBdicbfAicIECDqYklggpTmywT3eEzZ7rkelwA/0" data-ratio="0.20725388601036268" data-w="386" src="http://mmbiz.qpic.cn/mmbiz/uwD6icYMd8CdPvkFkiblghjjWUpcltNQViaNczNVUSUrFe0lCpCic3TBdicbfAicIECDqYklggpTmywT3eEzZ7rkelwA/0" style=""  /></span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">李丽的父亲患癌症去世了,她写下样的日记:父亲</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">59</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">岁,身体不错很少生病,去年</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">2</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">月体检切都很好,但从去年冬天开始偶尔咳嗽,当做感冒喝药治疗不见效果,直到过年期间出现咳血症状父亲依然不在意,一直拖到</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">3</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">月</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">12</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">日,我和妈妈强行带父亲去医院检查,做胸部平扫</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">CT</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">,发现左肺门肿瘤并且已经出现淋巴转移。之后量的化疗、尝试不同肿瘤药、缓解疼痛等手段,看起来并不能帮助父亲度过难关,但任何人都不想停止最后的努力,他在一天天消瘦中撑足</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">2</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">月。</span></span></p><p style="text-align:center;padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 15px;"><img title="1.JPG" height="600" src="http://www.medscience-tech.com/upload_files/article/235/30330_20121023161014_vfxrv.jpg" width="398" border="0" style="padding: 0px; margin: 0px; border: 0px;" data-ratio="1.5075376884422111" data-w="398"  /></span></span></p><p style="text-align:center;padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 15px;"><strong style="padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 12px; line-height: 24px;">GE医疗推出分子影像新产品</span><span style="padding: 0px; margin: 0px; font-size: 12px; line-height: 24px;">CT Discovery NM/CT670</span></strong></span></span></p><p style="text-align:left;padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">这样的片段基本代表了绝大癌症患者的命运。他们在身体出现病变征兆时往往已经接近癌症中后期,而个体差异会造成治疗效果不一,常常需要先尝试再检测效果。</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">事实上,实现个体化靶向性治疗一直是医疗领域的发展方向。医学影像是医生了解患者体内信息最直接的工具,历经百年,跟随分子生物学研究、基因组学、蛋白质组学及影像设备相关技术的进展,开始走向对生物活体内以细胞、基因或分子结构和功能的检测,而这正是靶向性治疗的基础。</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">换言之,细胞与细胞之间的沟通依靠其中一个细胞释放某分子,另一个细胞接受到信息发生变化,这种特异分子信息的探测和分析,就是做出疾病诊断的依据。利用分子影像手段能够看到早期变化,在患者使用药物治疗后,一两个星期内可以进行再观察判断是否需要改变治疗方案,这就是另一个作用,指导治疗药物的选择。</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">“肿瘤细胞长得快一定代谢快,这是生物学特性,并且对糖分的吸收也比正常细胞多一倍以上。这样通过分子影像设备就可以检测用药后是否有效抑制癌细胞扩散。”</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">GE</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">医疗集团分子影像科学家赵周社解释说,“分子影像学是对癌症早期诊断和分期治疗最有价值的技术研究,既有效推进靶向性治疗也能够节省癌症医疗费用的浪费。”</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">硬件难题</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">分子影像在癌症早期诊断中的运用具有很明显的优势和特性,但它从实验室到临床的道路也并非坦途。成像设备和生物标志物,是分子影像学在实践中的两大工具,两者在技术和研究实验的水平是分子影像发挥最大化作用的关键点。</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">2001</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">年,</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">GE</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">医疗在国内推出第一款将</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">(正电子发射计算机断层扫描)和</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">CT</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">相结合的一体机,正是了实现</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">本身对分辨率的高要求。在单模式</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">机应用中,</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">GE</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">医疗发现它具有发散型成像的特点,在检测中容易产生信号阻隔,利用</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">CT</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">的优势弥补这一缺陷使医生可以进行精确定位,看到患者的病灶具体部位。而在探测人体大脑等神经系统方面,</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">MR</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">(核磁共振)无疑是最佳助手,但难题在于制造</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET-CT</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">和</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">MR</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">一体机并不能将两者的优点协同起来。“我们发现</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET-CT</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">和</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">MR</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">真正结合时有两个很大困扰,一方面无法做衰减校正,另一方面功能兼容性上不能达到百分之百发挥其功用。技术上我们做出了</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET-MR</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">,但这并不成熟。”赵周社说,“没有一种模式的设备是万能的,未来多的将多种模式相结合是挖掘</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">价值的有效途径,也能解决</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">在技术上的瓶颈。”</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">有了影像设备,医生可以看到患者体内以分子为单位的信息体的表达,但它们在传递什么信息、有什么差异还无法知晓,这时候就需要标志物做比照。在</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">成像方面,</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">18F-FDG</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">(氟代脱氧葡萄糖)可用于评估心脏、肺脏以及脑部的葡萄糖代谢状况。通过给患者静脉注射</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">FDG</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">,然后用</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">PET</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">去看患者体内分子活动差异就能判断出分子的表达信息。赵周社举例说:“比如怎么看肿瘤糖代谢高?拿来对肿瘤敏感度高的标志物,正常分子吸收少,不正常的吸收多,就能诊断出来了。”</span></span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: 宋体; line-height: 30px; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(253, 254, 255); text-indent: 21pt;"><span style="font-size:3px;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">目前,获得国家批准的生物标志物有</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">12</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">种,</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">95%</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">的临床诊断都使用</span><span style="padding: 0px; margin: 0px; font-size: 15px;"><span style="font-family:Times New Roman;padding: 0px; margin: 0px;"><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">18F-FDG</span></span></span><span style="padding: 0px; margin: 0px; font-size: 14px; line-height: 28px;">,还有少数痰元素标记物。这些放射性药物都必须保证活性</span></span></p><p style=""><span style="max-width: 100%; font-family: 宋体, Verdana, Arial; line-height: 24px; word-wrap: break-word !important; box-sizing: border-box !important;"><img data-s="300,640" src="http://mmbiz.qpic.cn/mmbiz/A1DicCH9Vl6PAQiaibZlIAIKm4Tmrv1pxll6OTDl7vTPcW6yqKG3Eko0qlm1fbxKBWNTmzu5lib17XcCcPA9ICRsVQ/0" data-ratio="0.5573122529644269" data-w="" src="http://mmbiz.qpic.cn/mmbiz/A1DicCH9Vl6PAQiaibZlIAIKm4Tmrv1pxll6OTDl7vTPcW6yqKG3Eko0qlm1fbxKBWNTmzu5lib17XcCcPA9ICRsVQ/640" style="word-wrap: break-word !important; box-sizing: border-box !important; width: 698px !important; visibility: visible !important;"  /></span></p><p style=""><span style="max-width: 100%; font-size: 19px; font-family: 仿宋; word-wrap: break-word !important; box-sizing: border-box !important;">“</span><span style="max-width: 100%; color: rgb(79, 129, 189); font-weight: bold; font-size: 19px; font-family: 仿宋; word-wrap: break-word !important; box-sizing: border-box !important;"></span><span style="max-width: 100%; font-size: 19px; font-family: 仿宋; word-wrap: break-word !important; 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