TP53 and neoplasm: In the multivariable logistic regression analysis with 3 income categories, HI was significantly associated with the p53 mutation frequency after adjustment for node status, tumor ER status, tumor grade, and race/ethnicity [odds ratio (OR)  =  0.42, 95% CI: 0.18 to 0.97 for acquiring a tumor p53 mutation with increasing HI].