Cancer/testis antigen, Kita-Kyushu lung cancer antigen-1 and ABCD stratification for diagnosing gastric cancers

Figure 1 Variances of serum levels between the group with positive and negative Kita–Kyushu lung cancer antigen-1 expression in the gastric cancer patients. The titers of pepsinogen (PG) I (A), PG II (B), the ratio of PG I/PG II (C), and anti-Helicobacter pylori antibody (IgG) (D) were measured in the Kita–Kyushu lung cancer antigen-1 (+) and Kita–Kyushu lung cancer antigen-1 (-) groups. ^aP < 0.05; NS: Not significant using the Welch’s t-test.

Figure 2 The frequency of Kita–Kyushu lung cancer antigen-1 expression according to the ABCD stratification. The patients were classified into the A, B, C, and D groups using a combination of the status of Helicobacter pylori infection and PG value. The frequency of Kita–Kyushu lung cancer antigen-1 expression in each group was analyzed. ^aP = 0.0005, compared with the total study population (excluding group C) using the Fisher’s exact test. H. pylori: Helicobacter pylori.