疾病背景介紹
慢性淋巴細(xì)胞白血?。?chronic lymphocytic leukemia,CLL), 是一種淋巴細(xì)胞克隆性增殖的腫瘤性疾病,淋巴細(xì)胞在骨髓、淋巴結(jié)、血液、脾臟、肝臟及其他器官聚集。同時(shí)它也是一種老年性疾病,以免疫功能不全的高分化淋巴細(xì)胞克隆性增殖為主要特征。而BCL2/IGH雙色雙融合探針可以檢測(cè)染色體14q32.33處的IGH基因和18q21.33區(qū)的BCL2基因的易位。涉及的IGH(免疫球基因)和BCL2(b細(xì)胞淋巴瘤)基因的易位是CLL中位列第二的zui為常見的易位異常。
探針描述
BCL2/IGH融合基因探針,主要是以橙色熒光分子標(biāo)記BCL2的DNA區(qū)域和綠色熒光分子標(biāo)記IGH的DNA區(qū)域?yàn)樘结?,使其于癌?xì)胞核內(nèi)的BCL2和IGH基因序列雜交互補(bǔ)。正常情況下BCL2和IGH基因未發(fā)生融合時(shí),在熒光顯微鏡下顯示為兩個(gè)橙色信號(hào)和兩個(gè)綠色信號(hào)。當(dāng)存在融合基因時(shí),綠色和橘紅色信號(hào)因重疊形成黃色融合信號(hào)。
臨床意義
t(14;18)易位發(fā)生于85%的濾泡性淋巴瘤(FL)及1/3的彌漫性淋巴瘤(DL),且預(yù)后較差。IGH與BCL2相互易位是CLL中位列第二的最為常見的易位異常,可指導(dǎo)治療方案的選擇和預(yù)后評(píng)估。
參考文獻(xiàn)
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