Gastroenterology:改良的AFP模型可提高预测HCV肝硬化患者发生肝癌的能力

2014-05-08 佚名 dxy

在美国,肝细胞癌(HCC)在癌症相关的死亡原因中的比例快速上升,加上肝细胞癌的生存率低,因此实践指南推荐在高风险患者如有HCV相关的肝硬化中实行HCC的监测,以便早期发现HCC,接受有效的治疗,提高生存率。 虽然血清甲胎蛋白(AFP)已被广泛作为HCC的生物标志,但在5个高质量的研究中,AFP大于20ng/mL临界值则为阳性,其检测HCC的敏感性为41%-65%,特异性为80%-90%。 AF

在美国,肝细胞癌(HCC)在癌症相关的死亡原因中的比例快速上升,加上肝细胞癌的生存率低,因此实践指南推荐在高风险患者如有HCV相关的肝硬化中实行HCC的监测,以便早期发现HCC,接受有效的治疗,提高生存率。


虽然血清甲胎蛋白(AFP)已被广泛作为HCC的生物标志,但在5个高质量的研究中,AFP大于20ng/mL临界值则为阳性,其检测HCC的敏感性为41%-65%,特异性为80%-90%。

AFP水平受HCC和肝病严重程度和活跃度影响,研究发现,伴有进展性肝纤维化HCV感染者中AFP升高与血小板数的减少有关,还与谷草转氨酶(AST)/谷丙转氨酶(ALT) 比率升高有关。先前研究发现,随着HCC的进展,AFP和ALT水平之间存在着密切的关系,且AFP水平与血小板、AST、胆红素以及白蛋白水平显著相关。

考虑到这些影响AFP的因素,可能存在着调整的基于AFP的算法,来提高AFP对HCC的预测能力。美国休斯敦Hashem B. El-Serag等进行一项研究,发现基于AFP的改良模型对肝硬化患者6个月内发生肝细胞癌的预测能力升高。该结果发表在2014年5月的Gastroenterology上。

研究根据至少一个AFP试验和6个月的随访结果,肝硬化确诊患者。此算法数据包括年龄、谷草转氨酶、谷丙转氨酶、总胆红素、白蛋白、肌酐和血红蛋白水平,凝血时间、血小板数和白细胞数。研究者检测了根据AFP试验预测6月内的HCC不同公式的运算特性(校准值、辨别值和预测值),并在进展和验证子集中评估最终模型。

研究确认了11721名HCV相关的肝硬化患者,AFP检测35494次,有987名患者进展为肝细胞癌。此预测模型包含了AFP检测时的AFP、ALT、血小板水平和年龄(还有AFP和ALT及血小板之间的交互作用项),将发生HCC和不发生HCC的患者最大程度区别开。用此AFP调整的模型,与单用AFP相比,模型在不同AFP临界值的预测能力准确性增加。

给定任意AFP值时,低血小板数和ALT水平及较大年龄与HCC风险增加有关,高水平的ALT和正常或高血小板数与较低的HCC风险相关。例如,AFP 20ng/mL和120ng/mL时发生HCC的可能性分别是3.5%和11.4%。而在年龄70岁、ALT水平40IU/mL和血小板数100000的患者中,相同的AFP水平(20ng/mL和120ng/mL)发生的HCC可能性分别为8.1%和29.0%。

该研究改良和验证了基于AFP、血小板和ALT水平与年龄的运算模型,进一步提高了对HCV相关的肝硬化在6个月内进展为肝癌的预测能力。如果在其他患者群体中也得到验证,该模型可能有直接的临床应用价值。、

原始出处

El-Serag HB1, Kanwal F2, Davila JA3, Kramer J3, Richardson P3.A new laboratory-based algorithm to predict development of hepatocellular carcinoma in patients with hepatitis C and cirrhosis.Gastroenterology. 2014 May

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    2015-02-27 DoctorTao1991

    希望早点出现适合国内人群的计算公式

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    2014-08-24 mxj1971619
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    2015-03-26 许安
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    2014-05-10 ymljack
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