ST3GAL4 and neoplasm: Similarly, while ST3Gal.IV expression was also not statistically different between tumor tissue and normal urothelium in all the analyzed groups of patients, in samples from patients with non malignant tumors (group III) its mRNA expression was 3 to 4 times lower [ranging from 1.9 ± 1.1 (urothelium) to 3.5 ± 0.9 (tumors)] than samples from other patient's groups.