IMMUNOHISTOCHEMICAL EXPRESSION OF P53 IN INVASIVE DUCTAL CARCINOMA OF BREAST IN PAKISTANI WOMEN

Objective: To determine the frequency of immunohistochemical expression of p53 in invasive ductal carcinoma of breast in Pakistani women. Study Design: Descriptive, cross-sectional study. Place and Duration of Study: Department of Histopathology, Combined Military Hospital, Lahore, from Jul 2015 to Jan 2016. Methodology: This study involved 80 histopathological samples of invasive ductal carcinoma breast which weretested for p53 expression. Sample size with 80 cases was calculated using 95% confidence level and 10% marginof error while expected percentage of p53 expression will be 71.67%. Specimens were selected by non-probability, consecutive sampling. All specimens of newly diagnosed cases of invasive ducal carcinoma at CMH Lahore on histopathological examination of female patients aged between 15-80 years. IHC application of p53 was done as per technique mentioned in the manual given by the DAKO. Results: Patient age was calculated which was between 25 years and 80 years while mean age was 50.76 ± 11.80years. Majority of the patients were aged between 25-50 years (n=44, 55.0%). In 54 (67.5%) patients lymph nodes were positive for tumor metastasis. Majority 64 (80%) of the tumors were Grade-II followed by Grade-III in 15 (18.7%) patients. The size of the tumor ranged from 0.2 cm to 14 cm with a mean of 4.16 ± 2.59 cm. p53 expression was positive in 38 (47.5%) patients. The expression of p53 was higher in patients who have positive lymph nodes (59.3% vs. 23.1%; p=0.002). However, expression of p53 was not so significant for age (p=0.079), tumor size (p=0.414)...