Inverse correlation between high level expression of cyclin E and proliferation index in transitional cell carcinoma of the bladder.
OBJECTIVE
Overexpression of the G1 cyclins, D1 and E, and/or downregulation of p27(Kip1) allow uncontrolled tumour cell proliferation. This study investigated the relation between these three cell cycle proteins and tumour proliferation in bladder cancer.


METHODS
Nuclear expression of cyclin D1, cyclin E, and p27(Kip1) was determined immunohistochemically in 52 primary transitional cell carcinomas, and the Ki-67 proliferation marker was also assessed. For each protein, the percentage of positive tumour cell nuclei was determined and analysed as a continuous variable.


RESULTS
Advancing tumour grade and pathological stage were accompanied by increasing proliferation indices, but decreasing p27(Kip1) and cyclin D1 expression, with no significant change in cyclin E expression. Overall, cyclin D1 and E expression did not correlate with proliferation. However, in cyclin D1 overexpressing tumours (> or = 5% nuclei positive), the level of cyclin D1 expression positively correlated with proliferation. The correlation between cyclin E expression and proliferation changed from positive to negative with increasing levels of cyclin E expression, accompanied by a coordinate increase in p27(Kip1) expression. Overall, there was an inverse association between p27(Kip1) expression and proliferation. However, a subset of tumours displayed high proliferation indices despite high p27(Kip1) expression. The G1 cyclin index (sum of the level of expression of cyclins D1 and E) correlated positively with proliferation in superficial but not muscle invasive tumours. This correlation was stronger when the G1 cyclin index was adjusted for p27(Kip1) expression.


CONCLUSIONS
These findings support a role for these proteins in the proliferation, differentiation, and progression of bladder transitional cell carcinomas.
Khan
A A
AA
Department of Histopathology, Imperial College, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK.
Abel
P D
PD
Chaudhary
K S
KS
Gulzar
Z
Z
Stamp
G W H
GW
Lalani
E-N
EN
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis*; D002295:Carcinoma, Transitional Cell / Q000737:chemistry* / Q000473:pathology; D018797:Cell Cycle Proteins / Q000032:analysis; D002455:Cell Division; D019938:Cyclin D1 / Q000032:analysis; D019927:Cyclin E / Q000032:analysis*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D019394:Ki-67 Antigen / Q000032:analysis; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D018709:Statistics, Nonparametric; D025521:Tumor Suppressor Proteins / Q000032:analysis; D001749:Urinary Bladder Neoplasms / Q000737:chemistry* / Q000473:pathology
D014408:Biomarkers, Tumor; D018797:Cell Cycle Proteins; D019927:Cyclin E; D019394:Ki-67 Antigen; D025521:Tumor Suppressor Proteins; D019938:Cyclin D1; D050760:Cyclin-Dependent Kinase Inhibitor p27