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PET诊断早期肺癌N1淋巴结转移准确性欠佳

2015-01-15 baofeichao 丁香园

近年来,早期肺癌的非外科性的局部治疗,如体外定向放射治疗,消融治疗等局部治疗,其应用逐渐增多,虽然肺癌局部治疗患者往往死于远处转移,但也有一部分患者是因为局部淋巴结控制不佳所致。因此局部治疗前需明确患者是否存在N1淋巴结的转移,而PET是判断淋巴结是否存在转移较好的非侵袭性诊断方法,但其用于诊断肺癌N1淋巴结转移评估的报道目前较少。 近日,来自MD-Anderson癌症中心的Swishe

近年来,早期肺癌的非外科性的局部治疗,如体外定向放射治疗,消融治疗等局部治疗,其应用逐渐增多,虽然肺癌局部治疗患者往往死于远处转移,但也有一部分患者是因为局部淋巴结控制不佳所致。因此局部治疗前需明确患者是否存在N1淋巴结的转移,而PET是判断淋巴结是否存在转移较好的非侵袭性诊断方法,但其用于诊断肺癌N1淋巴结转移评估的报道目前较少。

近日,来自MD-Anderson癌症中心的Swisher博士等评估了PET在诊断肺癌N1淋巴结转移中的价值,同时比较了经PET评估的N1阳性和阴性患者的长期生存,该研究结果发表在最先的Annals of Thoracic Surgery。

该研究为回顾性研究,初步纳入877例术前行PET检查的cN0患者,术后病理提示93例(11%)患者为pN1,86例(10%)患者为pN2。PET诊断N1淋巴结是否存在转移的敏感性为22%,特异性为93%,阴性预测值为79%,阳性预测值为50%。

该研究进一步纳入术前行PET检查,术后病理例证实为T1-2N1M0(II期)的肺癌患者104例,其中IIA期(T1aN1,T1bN1或T2aN1)87例,IIB期(T2bN1)17例。

图1.jpg
图1. PET提示周围型肺癌SUV值升高(SUVmax=6),而N1淋巴结SUV值均为见明显升高,术后病理证实患者为N1阳性。

结果发现104例pN1患者中,术前PET检查提示为N1阳性的患者为25例(24%,图1),其余79例术前PET检查N1均为阴性,前者3年生存率为63%,中位生存期为64.7月,而后者3年生存率为66%,中位生存期为54月,两组患者间生存无显著性差异(图2)。
图2.jpg


图2. 术前PET提示N1阳性的患者与N1阴性患者的生存曲线.

(虚线所示为PET提示N1阳性患者,实线则为PET提示N1阴性患者)

综上研究结果,Swisher博士等认为PET诊断肺癌N1淋巴结是否存在转移敏感性欠佳,不能单一的将PET用于评估非外科性局部治疗的肺癌患者是否存在N1淋巴结转移。


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    2015-01-16 feather89
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    2015-01-17 sodoo
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    2015-01-15 zczcz6655

    那么有没有更好的方法判断呢?

    0

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