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当前位置:首页 > 公司新闻 >CAR T细胞免疫疗法是什么?

CAR-T英文全称是ChimericAntigen Receptor T-Cell ,中文叫嵌合抗原受体T细胞。

CAR-T细胞免疫疗法是医学界新出现的治疗肿瘤和癌症的一种方法。它先从病人身上提取出免疫T细胞,然后利用基因工程技术,在体外写入能让T细胞识别特定肿瘤细胞并杀死肿瘤细胞的基因片段,这种CAR-T细胞在实验室中大量培养,之后再把扩增后的这种"加强型" 免疫T细胞回输到病人体内进行治疗。

CAR-T治疗简单来说分为下列步骤:

1、采用血浆分离置换法提取收集患者体内白细胞,该步骤提取血液细胞,并分离出一种或多种血液成分。在实验室中,从白细胞中分离出T细胞。

2.、利用基因工程技术给 T 细胞加入一个能识别肿瘤的细胞,并且同时激活 T 细胞杀死肿瘤细胞的嵌合体,普通 T 细胞变身为CAR-T 细胞,它带着 GPS 导航,随时准备找到癌细胞,并且发动自杀性袭击,与之同归于尽。

3、体外培养,大量扩增 CAR-T 细胞,一般一个患者需要几十亿,乃至上百亿个 CAR-T 细胞,往往患者体形越大,需要的细胞越多。

4、把扩增好的 CAR-T 细胞输回患者体内。

5、 严密监护患者,尤其是控制前几天身体的剧烈反应。

CAR-T目前只能治部分的血液性肿瘤。

肿瘤是一种异质性疾病,不同的人患病的原因治疗的方法也都是不一样的,所以个别案例痊愈不等于彻底攻克癌症。

从目前的数据看,CAR-T的短期数据很好,但很快会复发。

Juno的JCAR015一期临床数据显示它在急性淋巴细胞白血病人身上的完全缓解率是87%,也就是说87%的患者治疗后找不到癌细胞了。但是,这87%的患者中有大约60%很快就会复发,活过6个月的人只有59%。所以哪怕是在CAR-T最擅长的白血病领域,它目前也没有能力完全治愈。

目前大多数的CAR-T针对的是CD19这个抗原,CD19只表达在B淋巴细胞上,所以它能够杀B淋巴细胞衍生出的急性淋巴细胞白血病和非霍奇金淋巴瘤,但对于其他肿瘤是完全无能为力的。

由于CAR-T目前只能用病人自身的免疫细胞来改造得到,所以成本高昂。

CAR-T的副作用目前来说还是比较大的。大量的T细胞攻击肿瘤细胞会在短时间内释放出大量的细胞因子,这个过程被称为“细胞因子风暴”,处理不好容易致死。

T细胞,T-Cell

T淋巴细胞(T lymphocyte)简称T细胞,是由来源于骨髓的淋巴干细胞,在胸腺(Thymus)中分化、所以叫T细胞,发育成熟后,通过淋巴和血液循环而分布到全身的免疫器官和组织中发挥免疫功能。

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