RESUMEN
Objective To investigate the significance of serum Let-7b in prostate cancer (PCa). Methods From July 2015 to September 2016, 72 patients with PCa (PCa group) and 34 healthy people (control group) were selected. The Let- 7b was detected by Western blot and fluorescence quantitative polymerase chain reaction (PCR), and the Let-7b was compared between 2 groups. Results The Let-7b in PCa group was significantly lower than that of control group (0.81 ±0.38 vs.1.31 ±0.34), and there was statistical difference (P<0.01). In PCa group, the Let- 7b in patients with TNM T3 and T4 stage was significantly lower than that in patients with TNM T1 and T2 stage (0.74 ± 0.39 vs. 0.88 ± 0.38), and there was statistical difference (P<0.05); the Let-7b in patients with hormone dependence was significantly higher than that in patients with hormone resistance (1.03 ± 0.40 vs. 0.64 ± 0.27), and there was statistical difference (P<0.05). Receiver operating characteristics curve analysis result showed that Let-7b sensitivity and specificity were 72.2％ and 88.2％ in the diagnosis of PCa. Conclusions Let-7b can indicate the degree of malignancy of the tumor and the hormone resistance. For patients with the high risk of early diagnosis of refractory PCa, the patients′ individualized treatment plan could be adjusted.