P53 nuclear stabilization is associated with FHIT loss and younger age of onset in squamous cell carcinoma of oral tongue (original) (raw)
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Indian Journal of Otolaryngology and Head & Neck Surgery, 2020
Mutations of p53 gene is one of the most common events in human cancers including oral squamous cell carcinoma (OSCC). However, its role in carcinogenesis and association with regard to prognosis is still under investigation and unclear. The aim was to study the expression of p53 in patients of OSCC and correlation with clinical presentation and prognosis. In this retrospective observational pilot study, we examined expression of p53 in 50 histologically diagnosed cases of OSCC and correlated it with initial clinical presentation and clinical events in follow up period. p53 expression was significantly negative (94%) in patients with history of only oral tobacco consumption while cases with additional history of smoking or alcohol were positive (p = 0.0001 and 0.011). On the other hand, aggressive course of the disease was found to be significant with p53 positivity in the form of lymph nodal extension (13 out of 17 cases) (p = 0.011) and recurrence (6 out of 10 cases) (p = 0.024). p53 was overexpressed (positive) in predisposing factors like smoking and alcohol but not in OSCC associated with chewing tobacco. p53 overexpression is also associated with advanced TNM stage. To the best of our knowledge, this is the first report where association of p53 overexpression and oral tobacco consumption associated OSCC was not observed and we recommend that carcinogenic events in chewing tobacco induced OSCC should be studied separately for its unique set of mutations. Keywords Oral squamous cell carcinoma Á p53 Á Chewing tobacco Á p53 mutation Á Prognosis
Prognostic significance of p53 protein overexpression in betel- and tobacco-related oral oncogenesis
International Journal of Cancer, 1998
Fifty-three patients with invasive transitional cell carcinoma of the renal pelvis and ureter were studied for p53 protein overexpression by immunohistochemistry. Overexpression of p53 protein was observed in 19 patients (35.8%). There was a significant correlation between overexpression of p53 protein and histologic grade (p ! 0.01). However, there was no correlation found between p53 immunoreactivity and pathologic stage. By univariate survival analysis, a significant difference in cumulative survival was observed between stage pT2 and stage pT3 or pT4 tumors (p ! 0.05). The difference in survival between patients with p53-positive and negative tumors did not reach statistical significance (0.05 ! p ! 0.1). Multivariate analysis revealed that pathologic stage had an independent prognostic value (p ! 0.05). The independent prognostic value of p53 protein overexpression did not quite reach statistical significance (p = 0.07). p53 protein nuclear overexpression appears to be a relatively weak prognostic indicator for patients with invasive transitional cell carcinoma of the renal pelvis and ureter.
The Journal of Laryngology & Otology, 1999
The TNM staging system is helpful but not enough to determine prognosis of the patients with squamous cell carcinoma of the oral tongue. T-stage alone is not suggestive for prediction of occult nodal metastases. For this reason, histopathological examination of 70 patients with squamous cell carcinoma of the oral tongue was done retrospectively. The histological differentiation, tumour thickness, perineural and lymphovascular space invasions, the amount of lymphocyte infiltration and pattern of tumour invasion were examined. Immunohistochemical examination was used to determine p53 immunoreactivity as well. The effect of these histopathological parameters and p53 immunoreactivity on nodal metastases and locoregional recurrence were analyzed using the chi-squared test. In terms of nodal metastases the only statistically significant difference between the two groups was tumour thickness, either <9 mm or >9 mm (p<0.05, \ 2 = 17.182). Tumour thickness, perineural invasion, lymphovascular space invasion, the amount of lymphocyte infiltration all correlated statistically with locoregional recurrence (/?<0.05, x 2 = 6.293 for tumour thickness; p<0.06, p = 0.054 for perineural invasion; p<0.05, \ 2 = 8.689 for lymphovascular space invasion; p<0.05, x 2 = 5.320 for lymphocyte infiltration). The immunoreactivity of p53 correlated significantly with larger primary tumour size (p<0.05, x = 5.440, lymph node metastases (p<0.05, X = 4.093) and with pathological tumour stage (p<0.05, x 2 = 5.713).
International Journal of Cancer, 1994
The aetiological factors for oral cancer are not the same in India and in Western countries. Epidemiological studies have shown a correlation between high incidence of oral cancer and heavy consumption of betel and/or tobacco in the Indian population, while this study indicates an association with a genetic change. The p53 tumour-suppressor gene is the most commonly identified mutated gene in human malignancies. Expression of p53 protein was examined in premalignant and malignant oral lesions from Indian patients who were consumers of betel, areca nut and/or tobacco, using anti-p53 monoclonal antibodies PAb I80 I and PAb 42 I. Cryosections from normal, premalignant or malignant oral mucosa were used for immunostaining and the observations were confirmed by immunoprecipitation. p53 protein was detected in 55% (l5/27) premalignant oral lesions (leukoplakia). Strong p53-positive staining was detected in 75% (24/32) of oral squamous-cell carcinomas. Normal oral mucosa did not show positive p53 staining (0124). The detection of p53 protein in premalignant oral lesions suggests that p53 aberrations are an early event in the development of oral cancer in India. The high incidence of p53 positivity in leukoplakia may be due to differences in aetiological factors. p53 overexpression in premalignant oral lesions is important in view of the significantly earlier onset of leukoplakia in the Indian population compared to the development of oral malignancy, and may be helpful in identifying lesions that are more likely to progress to malignancy. The frequency of p53 protein overexpression was high in premalignant and malignant oral lesions of patients who were heavy consumers of betel, areca nut and tobacco.
IP Innovative Publication Pvt. Ltd., 2017
Introduction: Oral squamous cell carcinoma (OSCC) is the sixth most common cancer in the world. It usually develops in males in the 6th and 7th decade and is caused by tobacco and alcohol consumption. Materials and Method: This study was performed on 40 histopathologically proven cases of squamous cell carcinoma of oral region in Department of Pathology SGRDIMSR, Amritsar, Punjab. Tissue were stained for H & E and further immunostained for p53 receptor. p53 expression was correlated with histological grading, age, sex, vascular, perineural, muscle invasion and lymph node metastasis. Results: In our study, maximum incidence was seen in age group of 41-60 years with a male:female ratio of 7:1. A statistically significant correlation between p53 positivity with grade of carcinoma and cases presenting with nodal metastasis was seen. However, no such correlation was seen with age, sex, vascular, neural and muscle invasion. Conclusion: p53 positivity shows a direct correlation with grade and lymph node metastasis of SCC in head and neck. Thus, p53 has an influence on prognosis.
Asian Pacific Journal of Cancer Prevention, 2016
Oral tongue squamous cell carcinoma (OTSCC) is the most common oral cancer subtype with a maximum propensity for regional spread. Our objective was to study if p53 expression might have any correlation with aggressive patterns of invasion within oral tongue cancers as well as with the histologically identified degree of oral tongue dysplasia. p53 immunoexpression was studied using immunohistochemistry in early staged OTSCCs (n=155), oral tongue dysplasias, (n=29) and oral tongue normal specimens (n=10) and evaluated for correlations with histological and clinicopathological parameters. Our study (n=194) showed a pattern of p53 expression increasing with different grades of tongue dysplasia to different grades of invasive OTSCC (p=0.000). Among the OTSCC tumours, positive p53 expression was seen in 43.2% (67/155) and a higher p53 labelling index was significantly associated with increased Bryne's grade of the tumour invasive front (p=0.039) and increased tumour depth (p=0.018). Among the OTSCC patients with tobacco habits, (n=91), a higher p53 labelling index was significantly associated with increased risk of local recurrence (p=0.025) and with lymphovascular space involvement (p=0.014). Evaluation of p53 through varying degrees of dysplasia to oral tongue cancer indicates that p53 expression is linked to aggressive features of oral tongue cancers and tongue precancers entailing a closer monitoring in positive cases. Among the OTSCCs, p53 expression is associated with tumour aggressiveness correlating with increased grading of invasive tumour front and tumour depth.
Journal of oral and maxillofacial pathology : JOMFP, 2014
The prevalence of oral squamous cell carcinoma (OSCC) has significantly increased over decades in several countries and human papilloma virus (HPV) has been indicated as one of the underlying causes. This suggests that HPV plays a role in the early stages of carcinogenesis but is not a requisite for the maintenance and progression of malignant state. p53 is a tumor suppressor gene that checks the cell and promotes apoptosis and cell repair that can be deactivated by mutations and a viral interaction leading to cancer and individuals with particular polymorphic variant of p53 is more susceptible to HPV-induced carcinogenesis. The present study has been carried out to detect and correlate p53 polymorphism/mutation, HPV DNA in the biopsy samples of oral cancer patients who had tobacco habits.
A low incidence of p53 mutations in pre-malignant lesions of the oral cavity from non-tobacco users
International Journal of Cancer, 1995
To determine the incidence of p53 mutations in premalignant lesions of the oral cavity from individuals without prior history of tobacco use, we have analyzed the conserved regions of the p53 gene (exons 5-9) in archival oral cavity lesion specimens obtained from patients with varied tobacco use histories, by polymerase chain reaction/single strand conformational polymorphism (PCWSSCP) and DNA sequencing analysis. Twenty-six lesions were analyzed from 14 patients, with multiple lesions obtained from 8 patients. Six of these patients used tobacco, (3 being cigarette smokers, I ex-cigarette smoker, I moderate cigar smoker and I snuff chewer). The remaining 8 patients had no prior history of tobacco use. Thirteen of the pre-malignant lesions exhibited severe dysplasia, 9 exhibited moderate dysplasia and 4 exhibited mild dysplasia. Four of the 26 lesions exhibited p53 mutations, each being from a tobacco user. None of the I 3 lesions from never-tobacco users exhibited p53 mutations. There was a significantly higher p53 mutation incidence in pre-malignant lesions from tobacco users (including ex-smokers) than in non-tobacco users as well as in cigarette smokers plus snuff chewers than in non-tobacco users. Two of the mutations were observed in lesions exhibiting severe dysplasia: I in a lesion exhibiting moderate dysplasia and I in a lesion exhibiting mild dysplasia. These data suggest that p53 mutation may be a very early event in oral cavity tumor progression and demonstrate that pre-malignant lesions obtained from nontobacco users do not exhibit p53 mutations. 0 199.5 Wiley-Liss, Inc.
Journal of medical sciences, 2022
Objective: To assess the immunohistochemical expression of p53 in tissue samples of oral squamous cell carcinoma (OSCC), oral epithelial precursor lesions, and normal oral mucosa. Material & Methods: A comparative cross-sectional study was jointly conducted at the Departments of Pathology and Oral and Maxillofacial Surgery of various medical and dental institutes of the country from April 2016 to March 2017. A total of 180 subjects were included in the study. Oral tissue specimens were collected for laboratory investigations after obtaining written consent from all subjects. p53 was assessed using immunohistochemistry in tissue samples of 60 cases of OSCC, 60 cases of epithelial precursor lesions, and normal oral mucosal samples of 60 healthy individuals. Data were recorded, evaluated, and analyzed by SPSS-20. Results: p53 protein expression was noted in 85% OSCC and 73% oral epithelial precursor lesions. Among healthy individuals, one subject showed p53 immunoreactivity in the normal oral mucosa. Conclusion: Raised p53 overexpression in OSCC and oral precursor lesions, compared to normal oral mucosa make it a probable candidate for a potential predictive biomarker in oral premalignancy and malignancy.