Serum antioxidative vitamin levels and lipid peroxidation in gastric carcinoma patients.

Serum antioxidative vitamin levels and lipid peroxidation in gastric cancer patients were compared with values for age-matched healthy subjects. Blood samples were collected from the stomach of cancer patients scheduled for surgical removal of their tumor. Serum ascorbic acid, alpha-tocopherol, beta-carotene, and retinol in serum were determined by high-performance liquid chromatography, and malondialdehyde levels were analyzed spectrophotometrically. General health characteristics and taste preference for spicy and/or salty food were assessed by a self-administered questionnaire. Significant decreases in serum ascorbic acid and beta carotene were observed in stomach cancer patient as compared to the control group. The levels of ascorbic acid in patients with gastric carcinoma were less than one-fifth of the control. Beta carotene and alpha-tocopherol levels in the serum of the cancer patients were significantly decreased compared to the control group, but there were no differences in retinol between the groups. Serum malondialdehyde levels were significantly higher in the cancer patients than in controls. The levels of ascorbic acid and alpha-tocopherol tend to be lower in the patient with a preference for spicy and salty food than in others without the preference. Our results demonstrate that a correlation existed between the levels of serum ascorbic acid and beta carotene, alpha-tocopherol and lipid peroxidation in gastric carcinoma.