Evaluation of GATA3 and p53 Expression in Urothelial Carcinoma and their Association with Clinicopathological Parameters: A Cross-sectional Study

Abstract

Introduction: Bladder cancer is the tenth most common cancer worldwide, with 90% of bladder cancers are Urothelial Carcinoma (UC). In India, its incidence is 1.6 per lakh population annually. GATA3 is a recently used immunohistochemical marker which is highly sensitive for UC. Alterations in the p53 pathway play an important role in tumour progression and the assessment of prognosis. Aim: To study the expression of GATA3 and p53 in UC and their association with clinicopathological parameters. Materials and Methods: An ambispective cross-sectional study was conducted in the Department of Pathology, Kalinga Institute of Medical Sciences, Bhubaneswar, Odisha, India, from September 2020 to August 2022. A total of 50 cases of histologically proven UC were subjected to immunohistochemistry with GATA3 and p53. The expression of GATA3 and p53 was evaluated in UC, and their association with clinicopathological parameters like age, gender, personal habits, tumour site, symptoms and signs, histological grade, and invasion into lamina propria and muscle was studied. The Chi-square test was used to determine the relationship between all parameters, with a p-value <0.05 considered statistically significant. Results were analysed by standard software (Stata version 23.1). Results: GATA3 expression was observed in 94% (47/50) of cases of UC. GATA3 expression was associated with histological grade and muscle invasion, with 66.7% (4/6) expression in high-grade muscle-invasive UC, compared to 91.30% (21/23) in non muscle invasive UC, and 100% (21/21) in low-grade UC. Additionally, 66.7% (14/21) of low-grade UC showed p53 expression, whereas 80% (24/30) of high-grade UC demonstrated p53 expression. Conclusion: GATA3 is a sensitive and specific marker for UC. Its expression is highly variable among different histological types of UC and decreases with increasing grade of tumour in the study. p53 expression was associated with the histological grade of the tumour and was statistically significant in this study. GATA3 can be utilised to predict the probable grade of the tumour and its behaviour by correlating it with p53.