\n\n
即 HPV 疫苗。HPV 有许多亚型,其中 HPV 16、18 亚型等为高危型。目前,国内外有二价、四价和九价疫苗。建议 11~12 岁青春期前的孩子接种疫苗,但可放宽至 9~26 岁。接种剂次依据年龄进行改动,可为 2~3 剂。特别需要注意的是,即使接种过疫苗的女性也要从 21 岁开始定期进行宫颈癌筛查。
\n\n目前,香港等地均有三种疫苗。国内主要有二价(适用于 9~25 岁女性)和四价疫苗(国外已批准本品用于 9~19 岁女孩,但国内缺乏相关有效数据,国内主张适用于 20~45 岁女性)。最近,九价疫苗也通过快速通道在我国获批(国内批准用于 16~26 岁的女性)。
\n\n对已经感染 HPV 病毒的患者来说,更需要的是治疗性 HPV 疫苗。目前主要有 DNA 疫苗、重组载体疫苗、蛋白或多肽疫苗。但是,治疗性疫苗的安全性、耐受性和临床意义还有待进一步评估。
\n\n过继细胞疗法(adoptive cell therapy,ACT)是指向宫颈癌患者体内输入患者外周血提取的具有抗肿瘤效应的免疫细胞,如非特异性的细胞因子诱导的杀伤(cytokine-induced killer,CIK)细胞、自然杀伤细胞(natural killer cell,NK ),特异性的细胞毒性 T 细胞(cytotoxic lymphocyte,CTL)等,从而增加患者的抗肿瘤能力。
\n\n树突状细胞(dendritic cell,DC)是目前已知的体内功能最强的抗原提呈细胞,在抗原提呈过程中起着重要作用。树突状细胞能识别人体全身各处的肿瘤细胞,释放淋巴因子,并把抗原信息呈递给免疫活性细胞(如有效性 T 细胞),促进其激活和大量增殖。
\n\n目前已有相关 DC 疫苗的研究:用重组 HPV 16 E7 或 HPV 18 E7 癌蛋白的自体 DC 输注给复发或进展的宫颈癌患者,但是没有明显的临床反应。DC-CIK 混合时,两者能相互调节而增加细胞因子的释放和细胞毒性,显著提高 CIK 细胞的增殖能力和杀伤活性。
\n\n免疫检查点即免疫抑制信号,在人类免疫调节通路中发挥重要作用。免疫检查点抑制剂可通过共刺激或共抑制信号途径来调节免疫强度和广度(T 细胞活性),提高人体的抗肿瘤免疫作用,避免正常组织受到破坏。
\n\n程序性细胞死亡蛋白 1(programmed cell death protein 1,PD-1)和程序性细胞死亡蛋白配体 1(programmed cell death-ligand 1,PD-L1)在宫颈癌的肿瘤细胞中均有表达,PD-1 与 PD-L1 的结合介导 T 细胞活化的共抑制信号,抑制 T 细胞的杀伤功能,对人体免疫应答起到负调节作用,其结合物抑制剂则能够使功能受抑制的 T 细胞恢复对肿瘤细胞的识别功能,从而实现通过自身免疫系统达到抗癌作用。
\n\n目前,宫颈癌的免疫检查点抑制剂主要有 Pembrolizumab、Nivolumab、Atezolizumab 和 Durvalumab。
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