Expression and significance of peroxisome proliferator-activated receptor gamma in breast tissue in obese patients with breast cancer

Abstract

Objective To explore the expression and clinical significance of peroxisome proliferator-activated receptor gamma (PPAR γ) in breast tissue in obese patients with breast cancer.Methods Breast tissue samples were collected from 60 obese patients with breast cancer (obese group),60 normal weight patients with breast cancer (normal weight group),the expression of PPAR γmRNA and protein of breast tissue were detected by reverse transcriptase-polymerase chain reaction (RT-PCR) and immunohistochemistry in all patients,and the data was analyzed between PPARγ mRNA and protein.Results Compared with normal weight group,the expression of PPAR γ mRNA and protein of breast tissue in obese group were increased obviously(0.79 ± 0.06 vs 0.42 ± 0.04,0.55 ± 0.07 vs 0.23 ± 0.03 )(P＜ 0.05 ),while the expression of PPAR 3 mRNA and protein were positively correlated (r =0.81,P＜ 0.05 ).In obese group,the positive expression of PPAR γ was 47 cases with 10 cases (21.3％) recurrence and metastasis,the negative expression of PPAR 3 was 13 cases with 11 cases (84.6％) recurrence and metastaais,there was significant difference(P ＜ 0.05 ).In normal weight group,the positive expression of PPAR γwas 19 cases with 4 cases ( 21.1％ ) recurrence and metastasis,the negative expression of PPAR 3 was 41 cases with 10 cases (24.4％) recurrence and metastasis,there was no significant difference (P ＞ 0.05 ).Conclusions Obese patients with breast cancer own a high expression trend of expression of PPAR γ mRNA and protein of breast tissue,which indicates that PPARγ may be play an important role in occurrence,evolvement and prognosis of obesity-related breast cancer. Key words: Breast neoplasms; Obesity; Peroxisome proliferator-activated receptor gamma