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Nature Medicine:AI工具可预测癌症患者对免疫治疗药物的应答

Nature Medicine:AI工具可预测癌症患者对免疫治疗药物的应答

免疫检查点抑制剂(ICI)是多种癌症的标准治疗方案,但大多数患者对此无应答,且原因仍不清楚,这一知识空白对患者预后和临床试验招募都产生了不利影响。

哈佛医学院等机构的研究人员近日开发出一种名为COMPASS的新型人工智能模型,该模型能够更准确地预测哪些患者最有可能对ICI产生应答。利用以往接受治疗的患者数据,它的预测准确率比现有的最佳方法高出8.5%。

这项研究成果于7月3日发表在《Nature Medicine》杂志上。COMPASS有望为癌症患者带来更优质的个性化医疗,提高新兴疗法临床试验的招募效率,并为研究人员提供新的药物靶点。

共同通讯作者、哈佛医学院的Marinka Zitnik表示:“在过去十年间,ICI通过调动免疫系统对抗并消灭癌细胞,彻底改变了癌症治疗。借助尖端的AI技术,我们可以在患者接受药物治疗之前,就识别出最有可能对特定ICI产生应答的人群。”

首批免疫检查点抑制剂于2011年获得美国FDA批准。这些药物针对肿瘤细胞或T细胞表面的蛋白质,包括PD-L1、PD-1和CTLA-4。这些蛋白质让癌细胞免受免疫系统的攻击。ICI通过阻断这种相互作用,使癌细胞重新暴露在免疫系统面前,从而被识别并消灭。

然而,对ICI产生应答的患者仅占一小部分。临床试验表明,只有10%至40%的患者能从ICI中获益,具体取决于癌症类型。对ICI无应答的患者不仅面临严重的副作用风险,还会在癌症进展期间因接受无效治疗而浪费时间。

于是,研究人员开发出COMPASS模型。该模型通过分析近16,000个基因的活性来预测ICI的治疗应答,目前已知这些基因在免疫细胞状态、肿瘤微环境相互作用以及信号传导通路中发挥作用。

COMPASS采用了概念瓶颈变压器(concept bottleneck transformer)架构:它不会输出毫无解释的“黑箱”预测结果,而是提供可供人类解读的结果,并为其输出结果提供合理解释。

COMPASS模型的架构(图片来自原文)

研究人员利用癌症基因组图谱(Cancer Genome Atlas)中的数据对COMPASS进行了训练,该数据库包含10,184例肿瘤样本的遗传序列和分子数据,覆盖33种癌症类型。借助这些数据,AI程序“学习”了哪些基因活性与不同类型ICI的应答者和无应答者相关。

随后,研究团队利用16项临床试验的结果对该模型进行微调,这些试验测试了不同ICI治疗方案在7种癌症类型上的效果。为了评估模型的准确性,他们将单个临床试验逐一从微调数据集中删除,并要求COMPASS预测缺失试验中ICI的应答者和无应答者。

结果表明,COMPASS在预测ICI疗效方面,其准确率比现有最佳方法高出近10%。这种准确率的提升在多种条件下均成立,包括不同的癌症类型、ICI药物、转录组测序平台以及活检部位。

由于结果具有可解释性,研究团队能够解释ICI应答异常值中的意外结果。例如,部分患者虽携带“免疫炎症型”肿瘤却未产生应答,其基因表达特征提示存在阻碍免疫反应的生物过程。

Zitnik解释说,如果这些结果在前瞻性临床试验中得到验证,COMPASS即可在肿瘤医院中作为决策辅助工具,帮助医生判断哪些患者能从ICI治疗中获益良多。

这种工具还将为ICI临床试验带来巨大益处,可帮助试验负责人招募最匹配的受试者,并让这些受试者产生积极应答的几率显著增加。

研究人员计划将更多数据整合到COMPASS中,看看是否能进一步提高其准确性。这些数据可能包括患者病历中的详细信息,或来自单细胞测序的数据,这些数据可能有助于阐明不同细胞群在ICI应答中的作用。

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  1. CONNECT:[ UseTime:0.000624s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000842s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000240s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000552s ]
  8. SELECT * FROM `article` WHERE `id` = 841340 LIMIT 1 [ RunTime:0.000390s ]
  9. UPDATE `article` SET `lasttime` = 1783391865 WHERE `id` = 841340 [ RunTime:0.023968s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000429s ]
  11. SELECT * FROM `article` WHERE `id` < 841340 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000540s ]
  12. SELECT * FROM `article` WHERE `id` > 841340 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001321s ]
  13. SELECT * FROM `article` WHERE `id` < 841340 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005616s ]
  14. SELECT * FROM `article` WHERE `id` < 841340 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001585s ]
  15. SELECT * FROM `article` WHERE `id` < 841340 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000729s ]
0.116733s