Lancet Oncol:新方法可以防止胃肠道间质瘤患者过度治疗

2012-01-22 MedSci MedSci原创

 2011年12月9日,芬兰研究人员已经开发出一种用来评估胃肠道间质瘤(GIST)患者复发风险的新方法。 他们的研究成果在线发表于12月7日的《 Lancet Oncology》上,有望更准确地筛选出那些有GIST复发风险和最可能从辅助全身治疗中受益的患者。 本文的主要作者来自芬兰赫尔辛基大学中心医院的Heikki Joensuu向Medscape医学新闻透露,“对于经诊断

 2011年12月9日,芬兰研究人员已经开发出一种用来评估胃肠道间质瘤(GIST)患者复发风险的新方法。


他们的研究成果在线发表于12月7日的《 Lancet Oncology》上,有望更准确地筛选出那些有GIST复发风险和最可能从辅助全身治疗中受益的患者。

本文的主要作者来自芬兰赫尔辛基大学中心医院的Heikki Joensuu向Medscape医学新闻透露,“对于经诊断可行手术的GIST患者,评估手术的复发风险显得尤为重要。”

他评论道“依据SSGXVIII/AIO实验结果(其在芝加哥举办的2011年美国临床肿瘤学会(ASCAO)上进行了报告),辅助性药物伊马替尼的标准用药时间目前延长至3年。斯堪的纳维亚肉瘤组XVIII/Arbeitsgemeinschaft Internistische Onkologie(SSGXVIII/AIO)实验评估切除了高风险肿瘤的患者以及那些彻底切除原发性肿瘤和转移灶后发生单处转移的患者。

Joensuu博士指出,然而,接受了3年的辅助性药物伊马替尼治疗后,患者的无复发存活率和存活率不仅改善,而且也出现了不良反应。

他说“因此,现在的关键挑战是治疗GIST患者时,要确定辅助治疗是否针对合适的患者。目前,很多GIST患者被给予辅助伊马替尼治疗,即使很多仅行手术就有望被治愈。”

Joensuu博士在解释本研究的缘由时表示,常用的风险分层方案的准确性尚不清楚,并且未对其进行充分的比较。

他说“这些方案中所用的有丝分裂计数和肿瘤大小临界值可能不是最佳的”

新模式可能降低成本

宾夕法尼亚州美国匹兹堡大学癌症研究院的Anette Duensing博士在随附的评论中写到,Joensuu和他的同事使用经验证的创新性预测模型,提供了关键性资料。因而,临床医生在区分可能获益于辅助治疗和不需借助辅助治疗疗效同样良好的高风险患者时就有了坚实的依据、方法和理由。

她补充到,“这种个体化方式最终会减少单纯手术就可以治愈患者的花费和副作用,并且可以集中精力于需要进一步治疗的高危患者。

预测复发风险

为了开发这种新模型,Joensuu 和他的同事汇集了基于人口的队列个体患者数据,以获得2560例未接受辅助治疗而可行手术的GIST患者数据库。

研究人员使用3常用的风险预测方法(国家卫生研究所(NIH)共识的标准,修改后的共识标准和武装部队病理学研究所标准),对肿瘤复发的风险进行分层。

他们还分析了无复发生存率的预后因素。

数据收集时存活患者的随访中位时间为4.0年(范围为0-45.8年)。GIST确诊时的年龄中位数为63岁(范围为9-96岁)。

研究结果表明,多数患者仅经手术即可治愈。

手术后估计的15年无复发生存率为59.9%(95%可信区间(CI),56.2%-63.6%),并且在随访的前十年,几乎无复发。

主要不良预后因素有大肿瘤的大小、高的有丝分裂计数、胃外位置、破裂的存在和男性。

肿瘤的大小和有丝分裂计数与GIST复发风险之间存在非线性关系。

与最小的肿瘤(直径<1.1cm)相比,最大的肿瘤(直径>15.0cm)的相关危险比(HR)为27.98(95%CI为8.79 - 89.06,P <0.0001) 。

与最低的肿瘤有丝分裂计数(< 2/50高功率显微镜视野)相比,最大的肿瘤有丝分裂数(> 10/50显微镜的高功率领域)相关HR为22.09(95%CI,14.98- 32.58,P <0.0001)。

考虑到这些相关性,研究人员开发了预后热图,图上的红色表示高风险,蓝色表示低风险。

Joensuu 解释说“在肿瘤学领域这些预后热图是一个新概念,其可以与许多肿瘤学专家所熟悉的基因表达热图相比较。”

接下来,“因为热图有点难理解,”研究人员发明了预后等高线图,图上与每个肿瘤相关的风险被描绘成颜色轮廓。

预后图诊断个体风险的准确度最高

研究人员发现,3个主要的风险分层模型均可相当准确地预测10年间GIST复发的风险。他们还指出,修改后的美国国立卫生研究院共识标准在确定最有可能受益于辅助治疗的高复发风险单组患者方面效果最好。

然而,与传统的风险分层工具相比,来源于非线性模型的轮廓图预测GIST个体患者的预后最准确。

非线性模型准确预测了复发的风险,其曲线下面积(AUC)为0.88(95%CI,0.86 - 0.90)。相比之下,美国国立卫生研究院共识分类标准的AUC为0.79(95%CI为0.76 - 0.81,P <0.0001),修改共识分类标准的为0.78(95%CI为0.75 - 0.80; P <0.0001),武装部队病理学研究所标准的为0.82(95%CI为0.80 - 0.85,P <0.0001)。

恩苏博士说,“与传统的风险评估方案相比,新的预后工具更准确一些,因为其考虑了与肿瘤大小和有丝分裂计数相关性风险的连续和非线性性质。”

“结果表明,修改后的国立卫生研究院标准在确定可考虑伊马替尼辅助治疗的单个高风险类别方面非常有效,但非线性模型可能非常适合个人患者咨询,尤其是复发风险接近高危群体的病例以及希望其风险被详细讨论的患者,“他说。
 
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    2012-02-06 howi
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    2012-10-01 minlingfeng
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