MAGEA4 and cancer: Comparison of the relative abundances of proteins in VLPs without antigen (MLV Gag) with those of carrying different cancer antigens showed reasonable correlation with Pearson’s correlation coefficients of r = 0.67 (MCAM vs. MLV Gag), 0.70 (TRP1 vs. MLV Gag), 0.74 (MAGEA10 vs. MLV Gag), 0.75 (MART1 vs. MLV Gag) and 0.78 (MAGEA4 vs. MLV Gag) (Fig. 5B).