Overexpression of stathmin in oral squamous-cell carcinoma: correlation with tumour progression and poor prognosis.
Stathmin is an intracellular phosphoprotein that is overexpressed in a number of human malignancies. Our previous study using proteomic profiling showed that significant upregulation of stathmin occurs in oral squamous-cell carcinoma (OSCC)-derived cell lines. In the current study, to determine the potential involvement of stathmin in OSCC, we evaluated the state of stathmin protein and mRNA expression in OSCC-derived cell lines and human primary OSCCs. A significant increase in stathmin expression was observed in all OSCC-derived cell lines examined compared to human normal oral keratinocytes. In immunohistochemistry, 65% of the OSCCs were positive for stathmin, and no immunoreaction was observed in corresponding normal tissues. Real-time quantitative reverse transcriptase-polymerase chain reaction data were consistent with the protein expression status. Moreover, stathmin expression status was correlated with the TNM stage grading. Furthermore, we found a statistical correlation between the protein expression status and disease-free survival (P=0.029). These results suggest that expression of stathmin could contribute to cancer progression/prognosis, and that stathmin may have potential as a biomarker and a therapeutic target for OSCC.
Kouzu
Y
Y
Department of Clinical Molecular Biology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan.
Uzawa
K
K
Koike
H
H
Saito
K
K
Nakashima
D
D
Higo
M
M
Endo
Y
Y
Kasamatsu
A
A
Shiiba
M
M
Bukawa
H
H
Yokoe
H
H
Tanzawa
H
H
D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D018572:Disease-Free Survival; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D007150:Immunohistochemistry; D015603:Keratinocytes / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics*; D009367:Neoplasm Staging; D011379:Prognosis; D012333:RNA, Messenger / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D050777:Stathmin / Q000096:biosynthesis* / Q000235:genetics; D014407:Tumor Cells, Cultured; D015854:Up-Regulation
D014408:Biomarkers, Tumor; D012333:RNA, Messenger; C493995:STMN1 protein, human; D050777:Stathmin