The expression of the tumor marker CASA (cancer associated serum antig
en) was studied in patients with mammary carcinoma; increased values w
ere almost exclusively seen in cases of manifest metastasis. No correl
ation existed between tumor stage, lymph node involvement and grading.
Marker levels were tested by means of enzyme-immune-assay of the firm
medac (Hamburg), with a cut-off value set at 4 U/ml.