Serum levels of alpha-1-antitrypsin (α1-AT) were measured and phenotypes were determined in 47 patients with cancer of the pancreas and in 160 hospital controls. The mean value of α1-AT ( ± SEM) in cases with cancer of the pancreas was 486 ( ± 18) mg/100 ml, and it was significantly higher than the corresponding mean value in controls, which was 434 ( ± 13) mg/100 ml (p ∼ 0.02). The frequency distribution of the cases of pancreatic cancer by α1-AT phenotype was: M1M1 49%, M1M3 21 % and other phenotypes 30%, whereas the corresponding frequency distribution among controls was: M1M1 53%, M1M3 21% and other phenotypes 26%; the two distributions are clearly compatible (p > 0.50).

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