Viral infection was more common in poorly differentiated tumors (P=0.032). qRT-PCR demonstrated that CDKN2A (p14ARF) had higher expression in tumor samples compared with paired noncancerous samples (P<0.001).
Both p15 and p16 are tumor suppressor genes that have 5' CpG islands; aberrant cytosine methylation of these islands has been associated with silencing of their expression.
In this study we established the simultaneous status of TP53, p16, p14ARF and PTEN tumor suppressor genes in 34 randomly chosen human glioma cell lines.
In the present study we systematically assessed the relative importance of the tumour suppressor proteins p53, p21(Waf1), pRb and p16(INK4a) in mediating oncogene-induced senescence in human melanocytes.
Methylation of one or more of the genes from the set p14ARF, RASSF1A and APC1A, was significantly (p=0.021) associated with worse prognosis even adjusting for tumor stage and differentiation (RR 2.2, p=0.037).
We analysed 64 primary lung carcinomas for promoter methylation of the tumour suppressor genes (TSGs) p16 (p16(INK4a)/CDKN2A) and p14 (p14(ARF)) by methylation-specific PCR, in order to evaluate aberrant methylation as a potential biomarker for epigenetic alterations in tobacco-related lung cancer.
HDs were also noted for known tumor suppressor genes (TSG), including CDKN2A, CDKN2B, SMAD4, and GALR1, and identified PDE4D and MGC48628 as potentially novel TSGs.
DAPK1 level in the tumour was significantly higher in females than in males, the MGMT and p16 levels were lower in the tumours with lymph node metastasis (N1 + N2) than in N0 samples.
In this study we explored the relationship between HBx and trimethylation of H3K9 (H3K9me3), and elucidated the underlying mechanisms in HBx inducing the tumor suppressor p16 gene silence.
In 98 samples of colorectal cancer studied, methylation of MGMT, DAPK, p16, hMLH1 and p14 was present in 31, 20, 17, 16 and 14% of tumors, respectively.
Sequencing of each exon of both tumour suppressor genes revealed p16INK4A mutation only in 3 out of 11 BL, but 1 of them also affected the p14ARF gene.
FAK has been shown to interact with p14ARF (alternative reading frame)#a well-established tumor suppressor#and functions in the negative regulation of cancer through both p53-dependent and -independent pathways.
Unexpectedly, metastasis was not observed in mice that developed spindle carcinomas, which expressed high levels of the tumour suppressors p16(Ink4a) and p19(Arf) , encoded by Cdkn2a, a gene frequently deleted in human SCCs.
These results suggest that mutation of CDK4 can create a tumor-specific antigen and can disrupt the cell-cycle regulation exerted by the tumor suppressor p16INK4a.