Bcl-2 immunostaining Negative Bcl-2 No. Positive Bcl-2 No Total Bcl-2 No SerumBcl-2 protein       Negative 19 8 27 Positive 3 10 13 Total 22 18 40

Note: Positive serum Bcl-2 concentration were found in 10 of 18 (55.6%) positive immunostaining cases, but in only 3 out of 22 (13.6%) negative immunostaining.

Table 3: Correlation between serum Bcl-2 protein concentration and immunostaining in 40 patients with gastric cancer