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J Pathol. 1996 Apr;178(4):410-4.

Interphase fluorescence in situ hybridization detection of t(2;13)(q35;q14) in alveolar rhabdomyosarcoma--a diagnostic tool in minimally invasive biopsies.

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  • 1Section of Paediatrics, Institute of Cancer Research, Sutton, Surrey, U.K.


The identification of t(2;13)(q35;q14) is a useful aid in the accurate diagnosis of rhabdomyosarcoma, distinguishing it from other small round cell tumours and supporting the distinction between alveolar and embryonal forms. Cytogenetic analysis is difficult and with the increased use of minimally invasive biopsy methods and primary chemotherapy, adequate tumour material is not always available. To overcome these difficulties, two-colour interphase fluorescence in situ hybridization (FISH) to detect t(2;13)(q35;q14) was developed and its utility in assessing minimally invasive biopsies was investigated. Two cosmid clones which mapped proximal or distal to the breakpoint region 13q14 and one yeast artificial chromosome clone that mapped distal to the 2q35 breakpoint were identified. In interphase cells containing t(2;13)(q35;q14), the configuration of cosmid and yeast artificial chromosome signals demonstrated the presence of the translocation. Five cases of rhabdomyosarcoma were analysed by interphase FISH. The t(2;13)(q35;q14) was detected in all four alveolar tumours and was confirmed by cytogenetics in two cases, but was absent in one embryonal tumour. This sensitive detection method is applicable to minimal amounts of fresh or frozen tumour.

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