Significant involvement of chromosome 13q deletions in progression of larynx cancer, detected by comparative genomic hybridization
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Head and neck squamous cell carcinoma (HNSCC) is a heterogeneous group of tumours with various clinical characteristics. These tumours generally exhibit complex karyotypes. Few studies of genomic imbalances have been performed exclusively in subgroups of larynx cancer samples at different stages of the disease. In the present study, chromosomal gains and losses were investigated in 52 larynx tumours, by using comparative genomic hybridization (CGH). The mean number of observed alterations was 37.7 per tumour. The most common sites of losses were 1p, 13q, Xp, and the most common gains were located in 1p, 9q, 16q. The overall number of gains was negatively associated with cancer grading. G1 tumours were also characterized by a higher frequency of deletions in 13q32 and amplifications in 1q23, than tumours in other grades (p < 0.05). The frequency of losses of 13q22 also positively associated with tumour size. There was no association between the frequency of losses in 13q and the presence of lymph node metastases at the time of diagnosis. Another statistically significant association was observed for gains at 1q22-23 and tumour size (p < 0.01). No statistically significant difference in the frequency of most common imbalances was detected between primary tumours with lymph node metastases and those without metastases. In conclusion, we discovered a significant involvement of 13q deletions in the progression of larynx cancer. All the other significant changes observed in the present study were reported previously as being important for HNSCC progression. It seems that multiple genes are disrupted in the process of neoplastic transformation in the larynx, and the networks of events remain to be elucidated.
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A. Stembalska,Department of Medical Genetics, University of Alberta, Edmonton, Canada