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Study of autofluorescence spectrum of dilute gastric juice in the diagnosis of gastric carcinoma
Author(s): 
Pages: 540-543
Year: Issue:  5
Journal: JOURNAL OF PEKING UNIVERSITY(HEALTH SCIENCES)

Keyword:  胃肿瘤/诊断胃液光谱法荧光;
Abstract: 目的:探讨稀释后胃液固有荧光光谱在胃癌诊断中的应用价值.方法:胃液稀释后,应用RF-5000型荧光分光光度计,以288 nm为激发光,测定300~800 nm发射光范围内的荧光光谱.结果:共测定了251例各种胃内良、恶性病变患者(其中进展期胃癌39例,重度异型增生1例)的稀释胃液固有荧光光谱,发现原有胃液固有荧光光谱有3个峰,稀释后胃液固有荧光光谱的峰位和峰数不变,仅相对荧光强度指数(FI)改变.胃癌患者稀释胃液(体积比1∶20)固有荧光光谱的峰位和峰数与胃内良性病变患者基本相同,仅第1峰(位于320~360 nm处)的相对荧光强度指数(P1FI)增大.用CART V2.0软件进行分析,以P1FI>38.995为胃癌诊断标准,用于诊断胃癌的先验概率的敏感度为85.0%,特异度为91.9%;后验概率的敏感度为82.5%,特异度为91.9%.如以P1FI>24.34作为胃癌阳性判定标准,则诊断胃癌的敏感度为95.0%,特异度为75.8%.结论:稀释后的胃液固有荧光光谱可能成为有效的胃癌临床诊断及筛查手段.
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