Figure 1: Bcl-2 distribution in control and patients (negative and positive) cases. Positive serum Bcl-2 expression was found in 13/45 patients (28.9%). The positive Bcl-2 protein was more frequently expressed in cancer cells in patients with gastric cancer patients (61.6 ± 10.9 unit/ml) than in the negative group (47.1 ± 3.4 unit/ml) , the difference being statistically significant (p<0.0001).