Expression of Ki67 and p53 Proteins: Breast Cancer Aggressivity Markers in Brazilian Young Patients.

Abstract:

: Background: The increase in breast cancer (BC) cases in young women is of great importance since the tumor behavior in this group is generally more aggressive than in their older counterparts, and strategies for early diagnosis and prognostication are needed. Therefore, this work sought to investigate prognostic markers associated with young (<44 years old) BC patients. Methods: Two hundred thirty-six primary tumor tissues from 232 BC patients, of which 44 had less than 44 years at diagnosis were evaluated regarding the expression of estrogen and progesterone receptors (ER and PR), human epidermal growth factor receptor 2 (HER2), Ki67, and p53 (used as an indicator of p53 mutations) through immunohistochemistry. Also, data regarding tumor size, histopathological grade (HG), lymph node metastasis disease stage, and patients' survival status were collected. Results: Early age tumors had higher Ki67 expression and p53 mutations, and these markers were positively correlated with each other and associated worse prognosis parameters, such as negativity for ER and PR and positivity for HER2, and with higher HG, tumor size, and disease stage. In young patients, Ki67 correlated with ER, PR, and HG, whereas p53 correlated with HER2 and disease stage. Also, Ki67 associated with BC death independently of time from diagnosis, patients age, tumor size, and disease stage, and showed a trend toward a positive correlation with death in young patients, but not in the older group. Conclusion: Young BC patients were more likely to have intensely proliferative tumors with p53 mutations and these markers may hold prognostic relevance in BC, especially in this subgroup of patients.

authors

Bocchi M,Pereira NS,Furuya RK,Fernandes CYM,Losi-Guembarovski R,Vitiello GAF,Amarante MK,Watanabe MAE

doi

10.1089/jayao.2020.0037

subject

Has Abstract

pub_date

2020-07-21 00:00:00

eissn

2156-5333

issn

2156-535X

pub_type

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