CLIN CANCER RES:低剂量环磷酰胺诱导抗肿瘤T细胞反应且与转移性结直肠癌患者预后有关

2017-11-16 MedSci MedSci原创

抗肿瘤T细胞反应可以控制肿瘤,但是免疫抑制机制会影响其功能。Treg细胞在转移性结直肠癌中发挥的作用尚未知。之前有研究证明Treg缺失可以增强结直肠癌特异性效应T细胞反应。在动物模型及人体试验中证实低剂量环磷酰胺可以靶向Treg,但是环磷酰胺对转移性结直肠癌的影响尚不清楚。CLIN CANCER RES近期发表了一篇文章研究这一问题。

抗肿瘤T细胞反应可以控制肿瘤,但是免疫抑制机制会影响其功能。Treg细胞在转移性结直肠癌中发挥的作用尚未知。之前有研究证明Treg缺失可以增强结直肠癌特异性效应T细胞反应。在动物模型及人体试验中证实低剂量环磷酰胺可以靶向Treg,但是环磷酰胺对转移性结直肠癌的影响尚不清楚。CLIN CANCER RES近期发表了一篇文章研究这一问题。

研究共纳入55例转移性结直肠癌患者,随机分为低剂量环磷酰胺组(50mg 每天2次)或对照组。在治疗及18个月随访期间检测外周血淋巴细胞数量、亚型以及抗肿瘤功能。研究结果表明,环磷酰胺可以抑制所有淋巴细胞亚群的增殖,但是效应T细胞可以很快适应并克服这种抑制效应,从而出现T细胞数量增加。其他细胞亚群如Treg,B细胞和NK细胞数量出现下降。后续的效应T细胞扩增和激活主要是肿瘤特异性T细胞,这些细胞可以分泌颗粒酶B和IFNγ。与对照组相比,环磷酰胺治疗的患者出现更强烈的IFNγ+肿瘤特异性T细胞反应,显着抑制肿瘤进展。

文章最后认为,环磷酰胺诱导的Treg缺失可以导致抗肿瘤免疫活性增强。该研究结果为转移性结直肠癌患者自身T细胞的优势提供了直接证据。文章同时认为未突变的自身抗原也可能作为免疫治疗的有效靶点。

原始出处:
Martin Scurr,Tom Pembroke,et al.Low-Dose Cyclophosphamide Induces Antitumor T-Cell Resopnses,which Associate with Survival in Metastatic Colorectal Cancer.CLIN CANCER RES.November 2017 doi:10.1158/1078-0432.CCR-17-0895

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在治疗严重的转移性结直肠癌的患者中,与安慰剂相比,TAS-102——曲氟尿苷和盐酸盐复方药物具有显着的总体生存效益。在临床前模型中,TAS-102+贝伐单抗,与单独使用二者任何一个药物相比,其在对抗结肠直肠癌异种移植的活性中表现出了增强。近日,在医学杂志Lancet Oncol上面发表了一篇研究文章,该文章旨在评估TAS-102+贝伐单抗的活性和安全性。

JAMA Oncol:抗肿瘤疫苗5T4联用环磷酰胺治疗转移性结直肠癌

研究认为改良安卡拉痘苗-5T4联用低剂量的环磷酰胺可有效延长转移性结直肠癌患者生存期

ANN ONCOL:MAPK信号通路基因改变对接受一线FOLFIRI联合贝伐单抗治疗的转移性结直肠癌患者预后的影响

MAPK酶1(MKNK1)位于RAS/RAF/ERK和MAP3K1/MKK/p38信号通路的下游。磷酸化MKNK1调节翻译起始因子4E的功能。翻译起始因子4E是转录控制的关键因素,其表达在转移性结直肠癌患者中升高。临床前数据表明MKNK1上调血管生成因子促进血管生成。ANN ONCOL近期发表了一篇文章,研究MKNK1基因改变是否可以预测接受一线FOLFIRI和贝伐单抗治疗的转移性结直肠癌患者的预

必看:肠癌大咖共话转移性结直肠癌靶向治疗热点

2017年10月27-29日,第二届中国抗癌协会肿瘤靶向治疗专业委员会年会在湖北武汉成功召开,肿瘤靶向治疗开展得如火如荼,其进展日新月异,本次大会特别邀请国内著名的肿瘤学基础和临床专家就相关领域最新进展进行精彩的专题报告,深入探讨前沿理论和热点问题。肿瘤资讯有幸邀请到张克亮、袁瑛、曾珊、张涛、殷先利、刘莺等教授,就转移性结直肠癌整体治疗策略及靶向治疗相关热点问题进行点评。