C3 and cancer: Analysis of the antigen complex from the SW1990 subclone did not detect FCGBP, but found LGALS3BP, a galectin 3 binding protein and a cancer marker widely expressed in a range of malignancies (Mascot score p < 0.05 in 3/3 independent runs), along with C3 (p < 0.05 in 2/3 analyses) and HPX (p < 0.05 in 1/3 analyses).