Frequencies of the α1-antitrypsin (Pi) alleles and haptoglobin phenotypes have been determined in a series of 264 North-German patients with bladder cancer. Compared to a healthy control population, we found a statistically significant decrease of Hp 2-2 phenotype in the patient series. A significant increase of the serum Pi Z allele, as previously shown for patient groups with certain other tumours, could also be confirmed for bladder cancer. Furthermore, a distinct association between a lowered M 3 allele and bladder carcinoma was observed.
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