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LANCET子刊|零成本、无负担,AI基于MRI影像发现脑肿瘤患儿的“少肌症”隐患

LANCET子刊|零成本、无负担,AI基于MRI影像发现脑肿瘤患儿的“少肌症”隐患

撰文 | 肖肖   责编 | 周叶斌

近年来,综合治疗的进步让越来越多脑肿瘤患儿得以长期生存,但许多幸存孩子表现出虚弱、易疲劳、活动能力明显低于同龄人。其关键原因之一是“肌肉减少症”,即支撑活动和代谢的肌肉在流失,而体重可能正常;若同时伴有超重或肥胖,则称为“超重型肌肉衰减症”。

评估肌肉含量及分布的金标准(如双能X线吸收法或全身MRI)因费用高、流程复杂且有辐射暴露,在儿童肿瘤随访中难以普及。此外,儿童处于生长发育期,年龄、性别、青春期差异使正常值界定困难,导致肌肉减少症在该群体中的真实发生率、时间、风险因素及临床后果等研究几乎是空白。

近日,哈佛医学院 Anna Zapaishchykova 博士和 Benjamin H. Kann博士联合Dana-Farber 癌症研究所、波士顿儿童医院、加州大学旧金山分校(UCSF)等多中心在 THE LANCET Digital Health上发表题为 Artificial intelligence analysis of temporalis muscle thickness for monitoring sarcopenia and clinical outcomes in individuals with paediatric brain tumours: a retrospective cohort study的研究,领衔开发了一种名为“iTMT”(基于人工智能的颞肌厚度测量)的创新方法,能从儿童脑肿瘤患者的脑部MRI扫描图像上“读”出颞肌(太阳穴位置用来咀嚼的肌肉)的厚度。在与同年龄、同性别的健康儿童数据对比后,就能得到一份个性化的生长曲线,实现零成本、零辐射的动态肌肉监测。

之所以选择颞肌(temporalis muscle)作为全身肌肉含量的参考肌肉,一是因为已有成人(尤其是癌症、老年、危重症患者)的历史研究表明颞肌厚度与全身肌肉总量、握力等肌力指标呈显著正相关,可以间接预测生存及并发症。二是因为颞肌位于颅骨两侧的颞窝内,骨性边界清晰,可以被稳定、精确地测量。最重要的是,测量不需要花任何成本去做额外的检测——脑肿瘤患儿的常规MRI扫描图像恰好包含了这块不起眼的肌肉。

团队分析了来自三个大型数据库的881名儿童脑肿瘤患者,共计5661次MRI扫描数据。患儿的随访年龄跨度从3岁到35岁,患病类型包括低级别胶质瘤、高级别胶质瘤、胚胎性肿瘤等。

在这项研究中,人工智能扮演的是高度自动化的“测量师”和“数据分析师”的角色。团队首先用2.3万多名健康人的脑部MRI训练AI模型,教会AI识别“什么是典型的正常颞肌”。随后他们针对儿童脑肿瘤患者的MRI数据进行了模型微调(fine-tuning),得到了iTMT 2.0版,训练好的AI模型能在几秒钟内精确地勾勒出MRI图像里左右两侧颞肌的轮廓并计算出颞肌的厚度。两位独立测评者认为AI结果的“可接受性”高达 88.8%,说明AI的测量精度已接近人类专家水平,但在速度和稳定性上却更胜一筹 

人工智能颞肌厚度(iTMT)分析流程、模型验证、结果可接受度测试及患者指标变化趋势示例图

结果显示,730名患儿中,高达73%(531人) 在其病程中的至少某个阶段出现了iTMT定义的肌肉减少症,其中发生在治疗前占比52.4%,发生在治疗后短期占比46.6%、治疗后长期占比70.1%。其中29.5%(215人)出现过“超重性肌肉减少症”。而这种风险在 BMI 数值中被隐匿了——在那些出现肌肉衰减症的患儿中,超过半数(55.4%)的孩子体重是正常的。

研究还发现接受过颅脑放疗,尤其是全脑全脊髓放疗的患儿,发生“超重性肌肉衰减症”的风险最高(p<0.0001)。这类患儿的肌肉减少和异常体脂增加的风险会持续升高,在治疗结束5年后开始明显,12年后达到顶峰。

不同 iTMT 肌少症性超重、iTMT 肌少症及单纯超重人群中各类内分泌疾病的患病率

肌肉流失会带来预后不良,包括身体功能下降、内分泌紊乱、更短的生存期。数据表明,iTMT百分位越低,幸存患儿在“儿科生活质量量表”中的身体功能评分就越低(p=0.058)——意味着日常活动能力更差。存在iTMT肌肉减少的患儿,被诊断出内分泌疾病(特别是生长激素缺乏、甲状腺功能减退)的比例显著更高(p=0.035)。在高级别胶质瘤这类恶性程度高的患儿中,诊断时就存在iTMT肌肉减少的患儿,其总生存期显著缩短(中位生存期仅9个月,而肌肉正常组为22个月,p=0.046)。 

不同 iTMT 肌少症性超重、iTMT 肌少症及单纯超重人群中各类内分泌疾病的患病率

研究最后也阐述了局限性:除了数据上存在选择偏差之外,患者的详细数据,例如是否接受过营养支持、运动干预或使用类固醇等也是缺失的。另外,对于“最合适”的肌肉衰减判定阈值(研究中暂用<15百分位)可能也需要优化。

尽管如此,这项成果仍然具有开创性意义iTMT方法利用人工智能技术透过常规的脑部MRI,识别出脑瘤患者身体里的肌肉变化,有望成为儿童脑肿瘤治疗和康复过程中的常规“监测仪”,帮助医生主动发现问题,更及时地提供营养支持,让打败坏细胞的“小刺刺”们活得更有力量、更有质量。

撰文

责编

制作

排版 | Sheila   校对 | uu

*本文由深圳市拾玉儿童公益基金会“儿童肿瘤前沿”团队编译或约稿,文中图表均源引自文献原文。本文著作权归文章作者所有,欢迎个人转发分享,未经允许禁止转载,作者拥有所有法定权利,违者必究。如需转载,请留言或联系shiyu@curekids.cn。本文旨在分享儿童肿瘤科研前沿成果,不是治疗方案推荐。如需获得疾病治疗方案指导,请前往正规医院就诊。

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原文摘要(Abstract)

Background
People with and who have survived paediatric brain tumour (PBT) have a poor quality of life due to physiological frailty, a primary component of which is sarcopenia (ie, low lean muscle mass) and the associated condition, sarcopenic overweight. MRI-based temporalis muscle thickness (TMT) is an image-derived biomarker for lean muscle, frailty, and survival in adult cancers. Here, we evaluated artificial intelligence-based TMT measurements (iTMT) to track sarcopenia in people with PBT at scale and identify trends, risk factors, and associations with morbidity and mortality.
Methods
We conducted the secondary analyses of three cohorts (one prospective trial and two retrospective databases). iTMT was applied to all MRIs from diagnosis until the last follow-up or tumour recurrence to generate longitudinal, patient-level iTMT percentile curves. We investigated the rates of iTMT-defined sarcopenia (iTMT <15th percentile) and sarcopenic overweight (iTMT <15th percentile and BMI or weight >85th percentile) and associations with physical functioning (Pediatric Quality of Life Inventory [PedsQoL] version 4.0), endocrine disorders, and survival via multivariable analyses, using generalised additive models for longitudinal data.
Findings
From all three databases, there were 5661 MRIs from 881 individuals. Of 730 patients with linked iTMT and weight (mean age 13·4 [SD 5·8]), 531 (73%) developed iTMT sarcopenia and 215 (29%) developed sarcopenic overweight at least once (median time: 5·1 years [IQR 1·4–10·6]). Of those with sarcopenia, 294 (55·4%) had normal weight and 153 (28·8%) were overweight or obese at time of sarcopenia. Radiotherapy was associated with iTMT sarcopenic overweight (p<0·0001), with the highest risk in craniospinal radiotherapy (p=0·013). iTMT sarcopenia was associated with poor physical functioning (p=0·058) and endocrine disorder diagnosis (p=0·035) in survivorship. In high-grade glioma, iTMT sarcopenia at diagnosis was associated with worse survival (log-rank p=0·046).
Interpretation
iTMT sarcopenia is an image-derived biomarker for morbidity and mortality in people with and who have survived PBT that is common and cannot be reliably predicted by BMI. Incorporating iTMT into practice would enable the routine monitoring of sarcopenia and help triage individuals for supportive interventions to mitigate sarcopenia and associated morbidity.

DOI: 10.1016/j.landig.2025.100973

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  1. CONNECT:[ UseTime:0.000565s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000733s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000514s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000544s ]
  8. SELECT * FROM `article` WHERE `id` = 763035 LIMIT 1 [ RunTime:0.000468s ]
  9. UPDATE `article` SET `lasttime` = 1781683159 WHERE `id` = 763035 [ RunTime:0.002498s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 763035 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000485s ]
  12. SELECT * FROM `article` WHERE `id` > 763035 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002153s ]
  13. SELECT * FROM `article` WHERE `id` < 763035 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002177s ]
  14. SELECT * FROM `article` WHERE `id` < 763035 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006860s ]
  15. SELECT * FROM `article` WHERE `id` < 763035 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007473s ]
0.123742s