[Radioimmunoassay of serum pepsinogen I in chronic gastritis and stomach cancer]. / Radioimmunologicheskii analiz syvorotochnogo pepsinogena I u bol'nykh khronicheskim gastritom i rakom zheludka.

Blood serum in stomach cancer and chronic gastritis has been compared. A sharp decrease in pepsinogen 1 level both in cancer and gastritis patients was found as compared with healthy subjects. Pepsinogen 1 level in poorly-differentiated tumor (37.4 ng/ml) was lower than in well-differentiated one (58.2 ng/ml).