Expression of Cyclin-dependent Kinase Inhibitor p21(WAF1/CIP1) in Non-small Cell Lung Carcinomas: Relationship with p53 Status and Proliferative Activity.
- Author:
Na Hye MYONG
1
Author Information
1. Department of Anatomic Pathology, Dankook University College of Medicine, Cheonan, Korea. myongnh@anseo. dankook.ac.kr
- Publication Type:Original Article
- Keywords:
Non-small cell lung neoplasm;
p21(WAF1/CIP1);
p53;
Ki-67;
Proliferative activity
- MeSH:
Biopsy;
Carcinoma, Squamous Cell;
Cell Cycle;
Humans;
Immunohistochemistry;
Lung Neoplasms;
Lung*;
Phosphotransferases*;
Smoke;
Smoking
- From:Cancer Research and Treatment
2001;33(4):329-334
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The objectives of this study are to elucidate the level of p21(WAF1/CIP1) expression in non-small cell lung carcinomas (NSCLCs) and to investigate the relationship between the p21(WAF1/CIP1) expression and clinicopathologic features; p53 overexpression; and proliferative activity measured by Ki-67 expression. MATERIALS AND METHODS: The expressions of p21(WAF1/CIP1), p53, and Ki-67 proteins were analyzed by immunohistochemistry in 45 formalin-fixed and paraffin-embedded NSCLC specimens. 43 patients underwent curative resections and 2 patients had bronchoscopic biopsy specimens only. The correlations between p21(WAF1/CIP1) immunoexpression and p53 status; Ki-67 proliferative activity; and clinicopathologic parameters were analyzed statistically by chi-square or Fisher's exact test. RESULTS: p21(WAF1/CIP1) expression in the carcinoma cells was found in 28 (62%) of 45 cases. There was no significant correlation between p21(WAF1/CIP1) expression and abnormal accumulation of p53 protein. In 16 (36%) of 45 cases, p21(WAF1/CIP1) was expressed inde pendently of p53 overexpressions. p21WAF1/CIP1 expression was not associated with patient sex, smoking history, pathological stage, tumor size, histological grade or type. However, p21WAF1/CIP1 immunoreactivity was significantly higher in older individuals over 59 years and tended to occur more intensely in the more highly differentiated portion of the squamous carcinoma. Also, a positive correlation between p21WAF1/CIP1 and Ki-67 expression was observed. CONCLUSIONS: The present findings overall suggest that aberrations in the relationship between p21(WAF1/CIP1) and p53 expressions may be important in the development of NSCLCs; that a p53-independent pathway may be substantially involved in the induction of p21(WAF1/CIP1) expression in NSCLCs; and that the proliferative activity of lung cancers might be dependent on positive control of the cell cycle by p21(WAF1/CIP1).
