Expression of calpain small subunit 1 in breast cancer and its clinical significance / 肿瘤研究与临床

ABSTRACT

Objective To investigate the expression of calpain small subunit 1 (Capn4) in breast cancer and its clinical significance. Methods The cancer tissues and the paraffin-embeded specimens of the corresponding adjacent normal tissues from 12 patients with breast cancer between May 2015 and July 2015 in Shanghai General Hospital were collected. The expression of Capn4 was detected by using immunohistochemistry. The paraffin-embeded specimens of cancer tissues from 70 breast cancer patients in Shanghai General Hospital between January 2009 and September 2011 were also collected. And the expression of Capn4 was detected. The correlation between Capn4 expression level and TNM stage, pathological grade, molecular markers as well as the prognosis of breast cancer was also analyzed. Results The expression of Capn4 in breast cancer tissues was higher than that in the corresponding adjacent normal tissues. The expression level of Capn4 was correlated with TNM stage (P = 0.002), T stage (P = 0.004), N stage (P = 0.004), M stage (P = 0.025), estrogen receptor (ER) status (χ 2 = 4.787, P = 0.029) and survival status (χ 2 = 5.826, P = 0.016). Kaplan-Meier survival analysis revealed that the median survival time in the higher expression of Capn4 group 90 months was shorter than that in the lower expression of Capn4 group (not reaching the median survival time), and there were statistical differences (χ 2 = 4.351, P = 0.037). Conclusions The expression of Capn4 in breast cancer tissues is upregulated. The expression difference is correlated with TNM stage, pathological grade, ER status and the prognosis of breast cancer, suggesting that it may become a new target and molecular marker for breast cancer treatment.