Vieillissement et cancer: coincidence ou relation etiologique?
; Demoulin, Stéphanie ; Petermans, Jean et al
in Revue medicale de Liege (2014), 69(5-6), 276-81
In Belgium and in other countries, the Cancer Registry data show an increased incidence of cancers related to age, the majority of tumors being diagnosed beyond 60 years. However, the mechanisms ... [more ▼]
In Belgium and in other countries, the Cancer Registry data show an increased incidence of cancers related to age, the majority of tumors being diagnosed beyond 60 years. However, the mechanisms responsible for this increase are not clear. Cancer could be chronologically associated with aging because of the long latency period between the exposition to carcinogenic agents and the appearance of clinical signs. Aging could also predispose directly to cancer by different mechanisms (impaired immune response, increased oxidative stress, shortening of telomeres, accumulation of senescent cells). In this review, we propose to describe different hypotheses which could explain the increased incidence of cancers in the elderly. [less ▲]Detailed reference viewed: 29 (0 ULg)
Human papillomavirus DNA strongly correlates with a poorer prognosis in oral cavity carcinoma.
; ; et al
in Laryngoscope (2012), 122(7), 1558-65
OBJECTIVES/HYPOTHESIS: The prevalence of human papillomavirus (HPV) in a clinical series of 162 patients with oral squamous cell carcinoma (OSCC) was studied. Furthermore, we analyzed the correlation ... [more ▼]
OBJECTIVES/HYPOTHESIS: The prevalence of human papillomavirus (HPV) in a clinical series of 162 patients with oral squamous cell carcinoma (OSCC) was studied. Furthermore, we analyzed the correlation between the immunohistochemical expression of p16, p53, epidermal growth factor receptor (EGFR), and HPV status to predict survival in OSCC patients. STUDY DESIGN: Retrospective study. METHODS: Paraffin-embedded samples from OSCC patients (n = 162) were evaluated for the presence of HPV DNA using both GP5+/GP6+ consensus polymerase chain reaction (PCR) and type-specific E6/E7 PCR to detect HPV types 6, 11, 16, 18, 31, 33, 35, 39, 45, 51, 52, 53, 56, 58, 59, 66, 67, and 68. Immunohistochemical staining for p16, p53, and EGFR was also performed. RESULTS: The type-specific E6/E7 PCR demonstrated that 65 of the 147 OSCC patients (44%) presented with high-risk (hr) HPV types and that 38 of the 147 OSCC patients (26%) presented with low-risk (lr) HPV types. Comparable p53 and EGFR expression levels were observed in the hr HPV+ group (41.5% p53+, 92% EGFR+) and the lr HPV+ group (57% p53+, 92% EGFR+). Conversely, a slight increase in the proportion of p16+ tumors was observed in the hr HPV+ group (65%) compared with the lr HPV+ group (44%). In regard to patient outcome, the presence of HPV was correlated with a worse prognosis (P = .007). CONCLUSIONS: A high prevalence of hr and lr HPV infections was detected in the OSCC patients included in the study. Moreover, hr HPV positivity was correlated with a decreased 5-year disease-free survival rate compared with HPV- and lr HPV+. [less ▲]Detailed reference viewed: 12 (0 ULg)
Combined analysis of HPV DNA, p16, p21 and p53 to predict prognosis in patients with stage IV hypopharyngeal carcinoma.
; ; et al
in Journal of Cancer Research & Clinical Oncology (2011), 137(1), 173-81
PURPOSE: We examined p16, p21 and p53 expression in combination with the presence of human papillomavirus (HPV) DNA as molecular markers to predict survival in patients with stage IV hypopharyngeal ... [more ▼]
PURPOSE: We examined p16, p21 and p53 expression in combination with the presence of human papillomavirus (HPV) DNA as molecular markers to predict survival in patients with stage IV hypopharyngeal squamous cell carcinoma (HSCC). METHODS: Paraffin-embedded tumours from HSCC patients (n = 75) were evaluated for p16, p21 and p53 expression by immunohistochemistry. HPV DNA was detected by GP5+/6+ consensus PCR and subsequent genotyping by E6/E7 type-specific PCR for HPV types 6, 11, 16, 18, 31, 33, 35, 39, 45, 51, 52, 53, 56, 58, 59, 66 and 68. RESULTS: Among the 61 specimens that tested positive for the beta-globin, HPV typing identified 50 patients with high-risk (hr) HPV types. HPV 16E7 DNA was detected in 74% (37 cases) of these specimens. Twelve patients were found to be infected with multiple HPV types. However, the presence of hrHPV DNA was not found to correlate with the proportion of disease-free patients. The 5-year disease-free survival rate was 73% in p53- tumours versus 48% in p53+ tumours (P = 0.008). CONCLUSION: In our series of patients with stage IV HSCC, the hrHPV+ subgroup had a similar prognosis (in terms of recurrence risk) as the HPV- subgroup. p53 overexpression was associated with a worse prognosis. [less ▲]Detailed reference viewed: 42 (6 ULg)
Regulation of p63 Isoforms by Snail and Slug Transcription Factors in Human Squamous Cell Carcinoma.
Herfs, Michael ; Hubert, Pascale ; Suarez-Carmona, Meggy et al
in American Journal of Pathology (2010), 176(4), 1941-1949
TP63 is a p53-related gene that contains two alternative promoters, which give rise to transcripts that encode proteins with (TAp63) or without (DeltaNp63) an amino-transactivating domain. Whereas the ... [more ▼]
TP63 is a p53-related gene that contains two alternative promoters, which give rise to transcripts that encode proteins with (TAp63) or without (DeltaNp63) an amino-transactivating domain. Whereas the expression of p63 is required for proper development of epithelial structures, the role of p63 in tumorigenesis remains unclear. Here, we investigated the role of Snail and Slug transcription factors, known to promote epithelial-to-mesenchymal transitions during development and cancer, in the regulation of p63 isoforms in human squamous cell carcinoma (SCC). In the present study, we observed that the expressions of DeltaN and TAp63 isoforms were, respectively, down- and up-regulated by both Snail and Slug. However, the induction of TAp63 was not directly caused by these two transcription factors but resulted from the loss of DeltaNp63, which acts as dominant-negative inhibitor of TAp63. In SCC cell lines and cancer tissues, high expression of Snail and Slug was also significantly associated with altered p63 expression. Finally, we showed that DeltaNp63 silencing reduced cell-cell adhesion and increased the migratory properties of cancer cells. These data suggest that the disruption of p63 expression induced by Snail and Slug plays a crucial role in tumor progression. Therefore, p63 and its regulating factors could constitute novel prognosis markers in patients with SCC and attractive targets for the therapeutic modulation of neoplastic cell invasiveness. [less ▲]Detailed reference viewed: 80 (18 ULg)
Implication des papillomavirus humains dans les cancers des voies aérodigestives supérieures
; Arafa, Mohammad Mahmoud Mohammad ; Delvenne, Philippe et al
in Bulletin du Cancer (2009), 96(9), 1-10Detailed reference viewed: 38 (2 ULg)