Fasting serum pyridoxal was assayed by an automated microbiological system in 60 patients investigated for dyspepsia, patients with active peptic ulceration being excluded from the study. Gastritis was present in 30 patients, gastric carcinoma in 16, six patients had benign polyps, and, in eight patients, radiology, endoscopy, and biopsy failed to shown any abnormality. Of the 52 patients with gastric pathology, 44 had a low serum pyridoxal.
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