Computational analysis indicated that miR-296-3p targeted PTEN, which regulates the phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway and PTEN is involved in the carcinogenesis of SCC. miR-296-3p directly regulated PTEN expression in head and neck cancer cells, with PTEN protein levels decreased in 4/19 the SCCs (21.0%), as compared with those in the IPs (76.4%).
We used immunohistochemistry to evaluate the expression of phosphorylated Akt (pAkt), mTOR, p70 ribosomal protein S6 kinase (p70S6K) and phosphatase and tensin homolog deleted on chromosome 10 (PTEN) in 91 cases of AC and 154 cases of SCC.
Significantly more squamous cell carcinomas compared with adenocarcinomas demonstrated loss of (negative) PTEN staining (26 of 44 [59%] versus 32 of 94 [34%]; p = 0.009).
Detailed correlative analyses of individual patient samples revealed a significantly greater proportion of SCC in TMA set 1 with higher PI3Kβ and lower PTEN expression when compared with adenocarcinoma.
PTEN loss was higher in lung ADC than in the adenocarcinoma component of ASC and significantly higher in lung SCC than in the squamous component of ASC.
There were no significant differences in the menstruation status and the expression levels of TFF-1 and PTEN mRNAs between adenocarcinoma and squamous carcinoma (p > 0.05).
Four PTEN-targeting co-expressed miRNAs and ACTN4- targeting miR-548b are independent prognostic biomarkers in human squamous cell carcinoma of the oral tongue.
The immunohistochemical assay showed that the PTEN protein expression level significantly declined in OSCC patients (2.37±1.01 µg/l) compared with that in healthy subjects (3.09±0.95 µg/l).
Our systematic analysis of proteins and glycoproteins demonstrates changes of protein and glycoprotein relative abundance in SqCC (TP53, U2AF1, and RXR) and in ADC (SMARCA4, NOTCH1, PTEN, and MST1).
In addition, CCND1 overexpression was significantly related to PTEN promoter hypermethylation in the whole group and in the group of patients with squamous cell carcinoma and lymph node invasion.