The results showed that RAI2 mRNA expression in mammary cancer had a negative relation with T stage (pooled OR: 0.76, 95% CI: 0.61-0.96; Cochran’s Q test, p = 0.753 and I2 = 0.0%; Figure 1B), N status (pooled OR: 0.82, 95% CI: 0.71-0.96; Cochran’s Q test, p = 0.317 and I2 = 11.4%; Figure 1C), histological grade (pooled OR: 0.23, 95% CI: 0.18-0.30; Cochran’s Q test, p = 0.003 and I2 = 52.5%; Figure 1D) and TNM stage (pooled OR: 0.62, 95% CI: 0.45-0.86; Cochran’s Q test, p = 0.433 and I2 = 0.0%; Figure 1E). The gene discussed is RAI2; the disease is breast cancer.