Since only one article reported the occurrence of 1 case of DVT, and the use of erythropoietin, there was no heterogeneity between the two groups, P < 0.05, and the incidence of DVT in the TXA group was not statistically different from the control group RR = 0.33, 95% CI Z (0.01, 8.32), P = 0.50. The gene discussed is EPO; the disease is deep vein thrombosis.