Fine needle aspiration (FNA) samples were obtained from 176 breast tumors suspected of malignancy, which were then subjected to conventional cytological and fluorescence in situ hybridization (FISH) analyses using the centromeric probes for chromosomes 1, 11, and 17. Histological examination revealed 157 breast cancers and 19 benign diseases (ten fibroadenomas, six intraductal papillomas, one intracystic papilloma, and two ADH). Sensitivity, specificity, and diagnostic accuracy were 85.4% 94.7%, and 86.4%, respectively, for cytology and 90.4%, 100%, and 91.5%, respectively, for FISH. These results demonstrate that FISH diagnosis of FNA samples has a diagnostic accuracy comparable to that of conventional cytology.
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