Preparation of immune sera against carcinoembryonic antigen (CEA).

CEA antigen obtained by the Wrocław team and CEA standard antigen from Chester Beatty Cancer Research Institute, London were used for immunization of goats. Two immunization methods were adopted: one with decreasing antigen doses beginning from 500 microgram and the other with equal, small doses of 10 microgram. Anti-goat IgG1 + IgG2 immune serum was obtained by immunizing a horse with 10 mg of the antigen with complete Freund's adjuvant. Anti-CEA immune sera obtained after immunization with small doses were highly active; in the RIA test they showed half maximum CEA binding at 1:40,000 and 1:80,000 dilutions. Likewise, the anti IgG1 and IgG2 serum from the horse proved to be highly active.