恶性血液病8号染色体数目异常的间期荧光原位杂交检测

目的　探讨间期荧光原位杂交 (fluorescenceinsituhybridization ,FISH)技术在检测恶性血液病 8号染色体数目异常中的价值。方法　采用常规细胞遗传学 (conventionalcytogenetics ,CC)和 8号染色体着丝粒特异性探针间期FISH技术对 8例CC检测显示 8号染色体数目异常的急性髓细胞样白血病患者、10例慢性髓细胞样白血病加速期或急变期患者和 3名正常人骨髓进行 8号染色体数目检测。结果9例CC检测为三体 8的患者中 ,FISH检测结果均与其一致 ,其中例 5经CC检测仅发现存在二体 8、三体8和四体 8克隆 ,而FISH检测不但证实了三体 8和四体 8克隆的存在 ,还发现存在一个较小的五体 8克隆。例 3和例 17经CC检测只发现一个细胞有三体 8,无法确定是否为三体 8克隆性畸变 ,FISH检测证实有三体 8克隆存在。例 9经CC检测未发现三体 8,FISH检测发现有三体 8克隆存在。与CC检测结果相比 ,除例 16三体 8检出率FISH结果明显高于CC检测结果外 ,其余均低于或接近CC检测结果。结论　间期FISH技术对检测 8号染色体数目异常具有重要价值 ,当CC检测正常、不肯定或中期分裂相质量差、数量少时作用更大 ,是CC的重要补充。

Detection of abnormal numbers of chromosome 8 with interphase fluorescence in situ hybridization in hematologic malignancies

Objective To explore the value of interphase fluorescence in situ hybridization(FISH) in the detection of abnormal numbers of chromosome 8 in patients with hematologic malignancies. Methods Conventional cytogenetics(CC) and interphase FISH using chromosome 8 centromere specific probe were simultaneously carried out to detect the abnormal numbers of chromosome 8 in eight acute myeloid leukemia cases with CC-unveiled abnormal numbers of chromosome 8, ten chronic myeloid leukemia cases in accelerated phase or blast crisis, and three normal individuals. Results Nine cases that displayed trisomy 8 by means of CC were confirmed by FISH. Among them, Case 5 only displayed diploidy 8, trisomy 8 and tetrasomy 8 by CC, at the same time, FISH confirmed the presence of trisomy 8 and tetrasomy 8 and also revealed a low percentage of a pentasomy 8 clone. Case 3 and Case 17 had each only one cell with trisomy 8 by means of CC, and this could not determine whether they had the trisomy 8 clone, yet FISH confirmed the existence of trisomy 8 clone. Case 9 did not display trisomy 8 by CC, but FISH revealed the existence of trisomy 8 clone. In the other cases, the percentages of trisomy 8 cells determined by FISH were close to or significantly lower than those by CC, but for Case 16 where the percentage of trisomy 8 cells by FISH was significantly higher than that by CC. Conclusion Interphase FISH is a useful method for the detection of abnormal numbers of chromosome 8, especially in the patients with normal or unsure karyotype or with less and bad metaphases. It is an important complement to CC.