Breast cancer in women is an important medical problem with public health and social implications. In spite of its great clinical importance, little is known about the cytogenetic features of breast carcinomas. Chromosomal abnormalities in some malignant tumors have been used for diagnosis and prognosis or for localizing genes involved in the pathology malignancies. In this report, we present the chromosomal abnormalities found in 32 primary breast ductal carcinomas. The tumor samples were studied using the technique for short-term culturing and cytogenetic analysis with G-banding. Only one tumor with normal karyotype was observed. Thirty one (99%) of the tumors had chromosomal abnormalities including 21 (65.6%) in which chromosome 1 was involved (trisomy, monosomy or structural abnormalities of the type t(1q;2p) and del(1q42). Other recurrent anomalies such as del(12p); del 4(p); +7; +8; -7; -3; were observed. The significance of these findings and their role in tumorogenesis will become more evident with close follow-up of women who have tumors with an abnormal karyotype.
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