Abstract
Breast cancer is the most frequent cancer threatening the lives of women between the ages of 30 and 64. The cancer antigen 15-3 assay (CA15-3) has been widely used for the detection of breast cancer recurrence; however, its sensitivity and specificity are inadequate. We previously found that the breast cancer cell line YMBS secretes mucin 1 possessing 3'-sulfated core1 (3Score1-MUC1) into the medium. Therefore, we here evaluated whether 3Score1-MUC1 is secreted into the blood streams of breast cancer patients, and whether it can serve as an improved breast cancer marker. We developed a lectin-sandwich immunoassay, called Gal4/MUC1, using a 3'-sulfated core1-specific galectin-4 and a MUC1 monoclonal antibody. Using the Gal4/MUC1 assay method, we found that 3Score1-MUC1 was profoundly expressed in the blood streams of patients with recurrent and/or metastatic breast cancer. The positive ratio of the Gal4/MUC1 assay was higher than that of the CA15-3 assay in both primary (n = 240) and relapsed (n = 43) patients, especially in the latter of which the positive ratio of Gal4/MUC1 was 86%. whereas that of CA15-3 was 47%. Furthermore, serum Gal4/MUC1 levels could more sensitively reflect the recurrence of primary breast cancer patient...Continue Reading
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