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p53 Expression Helps Identify High Risk Oral Tongue Premalignant Lesions and Correlates with Patterns of Invasive Tumour Front and Tumour Depth in Oral Tongue Squamous Cell Carcinoma Cases

  • Viveka, Thangaraj Soundara (Department of Preventive Oncology, Cancer Institute (WIA)) ;
  • Shyamsundar, Vidyarani (Centre for Oral Cancer Prevention Awareness and Research, Sree Balaji Dental College and Hospital) ;
  • Krishnamurthy, Arvind (Department of Surgical Oncology, Cancer Institute (WIA)) ;
  • Ramani, Pratibha (Department of Oral and Maxillofacial Pathology, Saveetha Dental College) ;
  • Ramshankar, Vijayalakshmi (Department of Preventive Oncology, Cancer Institute (WIA))
  • Published : 2016.02.05

Abstract

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.

Keywords

Oral tongue carcinoma;oral tongue dysplasia;p53 expression;increased tumour depth;local recurrence

Acknowledgement

Supported by : Tamilnadu Dr MGR Medical University

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