Tsukamoto S, Sugio K, Sakada T, Ushijima C, Yamazaki K, Sugimachi K. Reduced expression of cell-cycle regulator p27(Kip1) correlates with a shortened survival in non-small cell lung cancer.
Lung Cancer 2001;
34:83-90. [PMID:
11557117 DOI:
10.1016/s0169-5002(01)00216-1]
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Abstract
BACKGROUND
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.
METHODS
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.
RESULTS
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.
CONCLUSIONS
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.
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