Coexpression of Ets-1 and p53 in oral carcinomas is associated with P-glycoprotein expression and poor prognosis

Purpose. To determine the association between the expression of P-gp with Ets-1 and p53 proteins in oral squamous cell carcinomas (SCCs).

Materials and methods. Immunohistochemical analysis of Ets-1, P-glycoprotein (P-gp), and p53 proteins was carried out in 40 formalin-fixed, paraffin-embedded tissue sections from oral SCCs using specific antibodies for these proteins.

Results. Expression of Ets-1 protein was observed in 27/40 (68%) cases, P-gp was overexpressed in 27/40 (68%) cases, and p53 accumulation was observed in 26/40 (65%) cases. Twenty-two of 27 (82%) SCCs showed concomitant overexpression of Ets-1 and P-gp underpinning an association between the expression of these two proteins (P=0.007). Twenty-one of 27 (78%) Ets-1 overexpressing oral SCCs showed accumulation of p53 protein (P=0.015). Nineteen of the 27 (70%) P-gp expressing tumours showed p53 accumulation. Concomitant Ets-1 and P-gp overexpression was significantly associated with poor prognosis (P=0.002). In multivariate analysis using Cox's proportional hazards model, P-glycoprotein emerged as the most significant adverse predictor of disease-free survival (HR=6.2, P=0.003). The hallmark of the study was the significant association between the expression of Ets-1, P-gp, and p53 proteins in oral SCCs and their association with poor prognosis. Oral cancer patients showing concomitant expression of Ets-1, P-gp, and p53 proteins had shorter disease-free survival (median time of no recurrence=18 months) and worst prognosis (P=0.001) as compared to the cases overexpressing any of these proteins.

Conclusion. Concomitant expression of Ets-1, P-gp, and p53 proteins adversely affects the clinical outcome in oral SCCs.

Authors and Affiliations

1. Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India, , , , ,

   S. Soni,  P. Pande &  R. Ralhan

2. Surgical Oncology Unit, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India, , , , ,

   N. Shukla

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