[Determination, by in situ hybridization on interphasic nucleus, a cytogenetic DNA index; application to breast cancer; comparison of this DNA index to DNA indexes determined by imaging and flow cytometry].
In oncology, flow cytometry (FCM) and image cytometry (ICM) are commonly used to detect DNA aneuploid cell populations in solid tumors. Agreement between these two approaches is good. The use of both techniques in association minimizes the rate of FCM and ICM false negatives and gives better DNA pattern characterization, particularly for detection of any tumoral component in the FCM DNA diploid peak. Nevertheless, discrepancies exist between the FCM and the ICM DNA index values: the ICM DNA index is often greater than the FCM DNA index. The aim of the present study was to establish a cytogenetic DNA index by determining the chromosomal ploidy using a molecular cytogenetic approach and to compare it to the FCM and ICM DNA indexes. We present here the fluorescence in situ hybridization (FISH) technique we have adapted to the study of breast cancer in order to count the number of copies of the 22 + X human chromosomes in interphasic nuclei. This was achieved using a panel of 21 indirect FITC labeled probes which recognize specific chromosomic DNA sequences. Preliminary results obtained from DNA diploid and DNA aneuploid tumors are discussed.
Histologie Embryologie Cytogénétique, Faculté de Médecine de Montpellier-Nîmes, France. vago@infobiogen.fr
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P
Vago
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S
Lecart
J
J
Simony
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Lequeux
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M
Radal
J P
JP
Bureau
D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D002467:Cell Nucleus / Q000473:pathology; D004273:DNA, Neoplasm / Q000032:analysis*; D005434:Flow Cytometry; D006801:Humans; D019044:Image Cytometry; D017403:In Situ Hybridization; D007399:Interphase; D007621:Karyotyping; D011003:Ploidies
D004273:DNA, Neoplasm