“…The flow chart of literature screening is shown in Figure 1. among these studies, eight were from China, [7][8][9][10][11][12][13][14] four from Italy, [15][16][17][18] four from Poland, [19][20][21][22] three from Iran, [23][24][25] two from Australia, 26,27 two from Czech Republic, 28,29 two from Egypt, 30,31 two from Thailand, 32,33 two from The Netherlands, 34,35 two from Turkey, 36,37 and one each was from America, Austria, Denmark, India, Ireland, Slovenia, and Spain. [38][39][40][41][42][43][44] Thirty-three studies described the relationship between serum HE4 levels and the clinicopathological characteristics of EC, three studies described the relationship between tissue HE4 expression and the clinicopathological characteristics of EC, and two studies examined HE4 expression in both samples.…”