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Lung Cancer. 2001 Oct;34(1):83-90.

Reduced expression of cell-cycle regulator p27(Kip1) correlates with a shortened survival in non-small cell lung cancer.

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  • 1Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.



The cell cycle progression is governed by a family of cyclin-dependent kinases, which are regulated by associated cyclins and by phosphorylation. p27, a cyclin-dependent kinase inhibitor, regulates the progression from G1 into the S phase by binding and inhibiting cyclin/cdks. Although p27 mutations in human tumors are extremely rare, a reduced expression of p27 might to lead to a progression of cancer cells.


We examined tissues that had been surgically excised from 161 unselected Japanese patients with non-small cell lung cancer, and investigated the p27 protein expression by immunohistochemistry.


A reduced expression of the p27 protein was found in 63 cases (39.0%). Statistical correlation was found between the reduced p27 expression and advanced stage, although no correlation was found between the level of p27 expression and the gender, T factor, N factor or histological differentiation. The 5-year survival rate in the reduced group was 35.4%, which was statistically poorer than the 63.2% rate in the normal group (P=0.0016), in patients with complete resection. In a multivariate analysis, the level of p27 expression was found to be an independent prognostic indicator.


We demonstrated the expression of p27 protein to be a biological prognostic indicator which can indicate the subsets of patients with either a good or poor prognosis, in patients who underwent surgical resection.

[PubMed - indexed for MEDLINE]
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