Abstract
Loss of 11q material occurs in approximately 30% of advanced stage neuroblastoma and defines a distinct genetic subtype of this disease. These tumors almost always possess unbalanced gain of the 17q, along with many additional recurrent chromosomal imbalances. Loss of 11q and gain of 17q is often the consequence of an unbalanced translocation between the long arms of both chromosomes, but because of the involvement of other chromosomal mechanisms, the actual frequency of t(11;17) is unknown. In addition, chromosomal breakpoint positions for the t(11;17) are variable in different tumors, with breakpoints on neither the 11q nor 17q being well defined. We have used interphase fluorescence in situ hybridization analysis to detect a der(11)t(11;17) in a series of neuroblastomas with 11q loss/17q gain using a statistical approach which could be applicable to the detection of translocations in other solid tumors. The frequency of der(11)t(11;17) was approximately 90% in our neuroblastoma series. A balanced t(11;17) was also detected in a MYCN amplified tumor, which is a distinctly different genetic subtype from the 11q- tumors. Breakpoint positions on 11q were determined to be variable, whereas all breakpoints on 17q appeared to clust...Continue Reading
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