DCE-MRI和DWI对NSCLC脑转移的预测

2021-09-16 MedSci原创 MedSci原创

肺癌的患病率和死亡率在全球范围内都高的惊人。其中,非小细胞肺癌(NSCLC)约占肺癌的80%-85%。它通常并发局部和远端转移,尤其是脑转移。非小细胞肺癌的脑转移具有发生率高、预后不佳的特点。有研究报

肺癌的患病率和死亡率在全球范围内都高的惊人。其中,非小细胞肺癌(NSCLC)约占肺癌的80%-85%。它通常并发局部和远端转移,尤其是脑转移。非小细胞肺癌的脑转移具有发生率高、预后不佳的特点。有研究报道称,未经治疗的脑转移患者中位生存时间仅为1-3个月。

目前NSCLC脑转移的治疗策略主要包括手术治疗、放化疗、靶向治疗和免疫治疗。然而致命的并发症和高复发率势必限制这些治疗方案的疗效。

而M动态对比增强磁共振成像(DCE-MRI)和弥散加权成像(DWI)是预测肺癌治疗效果的常用方法。但她们在评估NSCLC患者全脑放疗(WBRT)联合EGFR-TKI(吉非替尼)的治疗效果方面预测价值研究报导数量有限,为此,有研究者对此进行了研究,并将结果发表于Open Med (Wars)上。

 

研究方法

 

研究者共纳入了253例NSCLC脑转移的患者。

纳入标准:

肺癌的诊断经NSCLC组织病理学或组织学证实;

入组前Karnofsky体能状态(KPS)评分在50份以上,且体力状态(PS)评分不超过2分;

入组前多次治疗原发灶;

入组后能接受放疗;

白细胞、血小板、肝肾功能正常;

表皮生长引子受体第19号外显子缺失或21号突变阳性,经PCR分析外周血样证实,预期生存时间>1个月。

 

研究者将患者分为“敏感组”和“耐药组”,所有受试者均需接受WBRT联合吉非替尼治疗,并在治疗前、治疗中、治疗后均行MRI及弥散加权成像(DWI扫描)。在治疗前第7、14、21、28天和治疗后1个月记录患者的病情,计算ADC值及其变化率。

 

治疗方法:

1. 所有患者均通过6MV高能X线放疗进行全脑放疗(2Gy/次,5次/周,共4周,总剂量40Gys),以颅骨基线为下界,上界、前后界开放,两侧与穿透野相对。

2. 所有患者均以250毫克/天的剂量口服吉非替尼。

3. 放疗后,患者需继续服药,除非出现病情恶化、病死或药物不耐受。

 

研究结果

1. 不同时间点的平均ADC值及其变化率

两组的 ADC mid、ADC post、ΔADC mid和 ΔADC post值之间存在显着差异(P < 0.05)。

与耐药组相比,敏感组表现出更高的ADC mid、ADC post、ΔADC mid和 ΔADC post值,这些都表明ADC值及其变化率与联合治疗的疗效有关。

2. 不同时间点最大肿瘤直径与肿瘤消退率比较

如下图所示,治疗前、治疗第7天和治疗第14天,两组最大肿瘤直径无统计学差异。治疗后第21天、28天和放疗结束后1个月,两组最大肿瘤直径均减小。其中耐药组降低无统计学意义(P>0.05),而敏感组则显著降低(P<0.05)。两组在第7天和第14天后最大肿瘤直径变化率、Δd 7 (%)和Δd 14 (%)无显着差异(P> 0.05)。

 

此外,敏感组肿瘤消褪率显著高于耐药组,敏感组肿瘤最大直径显著低于耐药组(P<0.001)。这些结果均表明敏感组患者对联合治疗反应良好。

 

3. ROC曲线评估各种影像学指标对WBRT和吉非替尼治疗的NSCLC脑转移结果的预测效果:

 

结果表明肿瘤消退率、ΔADC post和ΔADC post(%)是预测WBRT及吉非替尼治疗后脑转移NSCLC患者预后的关键影像学指标。

4. 短期治疗效果

治疗三个月后,总缓解率为54.15%(137/253),疾病控制率为45.85%(116/253)。

 

5. 长期预后

两组KPS评分、生存改善病例数、中位生存时间及随访后3年生存率差异有统计学意义(P<0.05)。

 

综上所述,本研究结果表明:肿瘤消退率、ADC post、ΔADC post和ΔADC post (%)可作为预测WBRT联合吉非替尼治疗NSCLC脑转移患者疗效的重要影像学指标。

 

参考文献:

Chengyu Ye etal.Predictive effect of DCE-MRI and DWI in brain metastases from NSCLC.Open Med (Wars). 2021; 16(1): 1265–1275.

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    2022-03-15 lishizhe
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    2021-09-18 hyf028
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    2021-09-17 刘明国

    学习

    0

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    2021-09-16 ms3000000813542945

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    2021-09-16 ms5000000518166734

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    2021-09-16 137756abm51暂无昵称

    学习了

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