Type 1 (11; 22)(q24: q12) translocation is common in Ewing’s sarcoma/ peripheral neuroectodermal tumour in south Indian patients
2005
Parija, T. | Shirley, S. | Uma, S. | Rajalekshmy, K. R. | Ayyappan, S. | Rajkumar, T.
The Ewing’s sarcoma family can present diagnostic difficulties. In the past the basis of diagnosis has been a exclusion. Identification of a specific translocation especially t(11; 22) (EWS-FLI 1 fusion gene), which is seen in nearly 85% of Ewing’s sarcoma cases can help in precise diagnosis. We have carried out a study on twenty patient samples diagnosed to have Ewing’s sarcoma/peripheral neuroectodermal tumour (PNET)/small round cell malignant tumour. The study involved RT-PCR analysis for the fusion transcript, followed by sequencing to identify the specific type of fusion. Ninety percent (18/20) of the samples tested were found to be t(11; 22) translocations involving EWS-FLI 1 genes. Sixty-one percent (11/18) were found to be type 1 fusion and seven were type 2 (39%). This is the first study in India with quantitative information about the types of EWS-FLI 1 translocations present in Ewing’s family of tumours in south Indian patients.
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