Abstract
In a blind study, chromosome aberrations in tumor cells were analyzed by conventional cytogenetic techniques (G banding) and nonradioactive in situ hybridization with chromosome-specific probes. The material was obtained directly from patients with hematologic diseases and from colon tumor derived cell lines. The cytogenetic data obtained with G banding were in accord with those obtained by in situ hybridization to metaphase chromosomes. Most importantly, in situ hybridization to interphase nuclei gave reliable results and even allowed detection of cell subpopulations that were not detected by analyzing metaphase chromosomes. Furthermore, in retrospect, even structural aberrations could be detected in interphase nuclei; abnormal cells with either an i(1q) or a translocation der(1)t(1;7) could be identified. Our results show that the application of in situ hybridization in combination with routine cytogenetic techniques offers significant advantages for cytogenetic analysis of solid tumors and hematologic malignancies.
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