Fig. 1

Quantile plots of the corrected difference and Chi Square values of the Breast Cancer versus Ovarian Cancer results after frequency correction. The difference of breast cancer (n ≥ 9) versus ovarian cancer (n ≥ 9) using the quantile plot that tended to zero (see quantile line). Similar results were obtained by comparison to breast cancer or other controls (not shown). Plots: a quantile plot of the observation frequency of tryptic peptides from breast cancer–ovarian cancer; b χ² plot of the observation frequency of tryptic peptides from breast cancer–ovarian cancer tryptic peptides; c quantile plot of the observation frequency of tryptic STYP peptides from breast cancer–ovarian cancer; d χ² plot of the observation frequency of tryptic STYP peptides from breast cancer–ovarian cancer tryptic peptides