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Objective: To investigate the relationship between gender differences in fatty acid-binding protein7 (FABP7) and BRN2 (POU class 3 homeobox 2) expression in renal cell carcinoma (RCC) and the prognosis of patients with RCC.
Materials and Methods: immunohistochemical (IHC) staining as well as reverse transcription-polymerase chain reaction (RT-PCR) was performed in renal tissues from 103 patients (83 men, mean age = 63.6 years old; 20 women, mean age = 63.1 years old) underwent radical nephrectomy from January 1, 2001 through December 31, 2010. The probability of overall patient survival was estimated using the Kaplan-Meier method.
Results: FABP7 mRNA expression was more frequent in men (P = 0.07) while BRN2 protein expression was significantly more frequent in women (P = 0.029). In particular, FABP7 was expressed in 100% of G1 renal cell carcinoma both in mRNA and protein levels. In women, FABP7 (-) and BRN2 (+) groups had a worse prognosis both in mRNA level (P = 0.038) and protein level (P = 0.058). BRN2 was expressed 100% of papillary RCC both in mRNA and protein levels.
Conclusions: Our results demonstrated that gender was a key factor in FABP7 and BRN2 expression in RCC, and the combination with FABP7 and BRN2 stratified by gender could be a new potential prognostic factor in patients with RCC.
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