Abstract
Indirect immunofluorescence tests were performed on 14 established human breast cancer cell lines using sera from a variety of subjects. Autologous reactions were studied on 10 cell lines, with positive reactions demonstrable in 8. Tests using sera from a randomly selected population of breast cancer patients showed reactivity in 40 to 66% depending on the target cell line used. Reactivity to other nonbreast cancer cell lines was rare. Several control populations were tested, including normal blood bank donors, persons with benign breast disease, and persons with other forms of cancer; immunofluorescent antibody was detected much less frequently in sera from these populations than those from the breast cancer group. Positive reactions remained in spite of absorption of serum with heterophile antigens, normal human breast tissue, and AB+ red blood cells. Thus established cell lines of human breast cancer possess antigens commonly recognized by sera from breast cancer patients.
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