MUC16 and gastric cancer: Gastric cancer patients were divided into four groups: Group 1) low CA19-9, low AFP and low CA125; Group 2) high CA19-9, low AFP, and low CA125; or low CA19-9, high AFP, and low CA125, or low CA19-9, low AFP, and high CA125; Group 3) high CA19-9, high AFP, and low CA125, or high CA19-9, low AFP, and high CA125; or low CA19-9, high AFP, and high CA125; and Group 4) high CA19-9, high AFP, and high CA125.