期刊
BRITISH JOURNAL OF CANCER
卷 98, 期 10, 页码 1662-1669出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.bjc.6604360
关键词
BMI-1; endometrial carcinoma; immunohistochemistry; mRNA; gene signature; hormone receptors
类别
We studied the expression of polycomb group (PcG) protein BMI-1 in a large population-based patient series of endometrial carcinomas in relation to clinical and molecular phenotype. Also, 57 fresh frozen endometrial carcinomas were studied for the relationship between BMI-1 protein expression, BMI-1 mRNA level, and activation of an 11-gene signature reported to represent a BMI-1-driven pathway. BMI-1 protein expression was significantly weaker in tumours with vascular invasion (P < 0.0001), deep myometrial infiltration (P = 0.004), and loss of oestrogen receptor (ER) (P < 0.0001) and progesterone receptors (PR) (P = 0.03). Low BMI-1 protein expression was highly associated with low BMI-1 mRNA expression (P = 0.002), and similarly low BMI-1 mRNA expression correlated significantly with vascular invasion, ER and PR loss, and histologic grade 3. In contrast, activation of the reported 11-gene signature, supposed to represent a BMI-1-driven pathway, correlated with low mRNA expression of BMI-1 (P < 0.001), hormone receptor loss, presence of vascular invasion, and poor prognosis. We conclude that BMI-1 protein and mRNA expression are significantly correlated and that BMI-1 expression is inversely associated with activation of the 11-gene signature. Loss of BMI-1 seems to be associated with an aggressive phenotype in endometrial carcinomas.
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