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Toyama, T. et al.

Toyama, Iwase, Yamashita, Hara, Omoto, Sugiura, Zhang, Fujii,

Reduced expression of the Syk gene is correlated with poor prognosis in human breast cancer.

Syk is a non-receptor type of protein-tyrosine kinase that is widely expressed in hematopoietic cells. Syk expression has been reported in breast tissue. However, the function of Syk in breast tissue remains unclear. In 25 (28%) of the 90 paired samples of human breast cancer and the matched, adjacent non-cancerous tissues examined here, reduced mRNA expression of Syk in the breast cancer tissues was observed by real-time quantitative reverse transcription-polymerase chain reaction. Eight (32%) of the 25 cases showing reduced Syk mRNA expression demonstrated distant metastasis of breast cancer, while only 4 (6%) of the 65 cases who did not show reduced Syk expression had distant metastasis. Kaplan-Meier curves demonstrated that patients with reduced Syk expression were at significantly increased risk for distant metastasis (P=0.0003). Our data suggest that reduced Syk expression in breast cancers is associated with distant metastasis and poor prognosis; therefore, Syk is considered to be a potential tumor suppressor and anti-metastasis gene in human breast cancer.[1]

References

Reduced expression of the Syk gene is correlated with poor prognosis in human breast cancer. Toyama, T., Iwase, H., Yamashita, H., Hara, Y., Omoto, Y., Sugiura, H., Zhang, Z., Fujii, Y. Cancer Lett. (2003) [Pubmed]

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