Heat map of glycopeptides in the blood sera of early OCCC, advanced OCCC and endometrioma patients. The Y-axis represents 300 individual glycopeptides in the MS spectra and the X-axis represents the individual patients in endometrioma, early OCCC, and advanced-stage OCCC patient groups. The spectral colors in the matrix represent the ratio level of glycopeptide peaks in the individual compared to the average level in the non-cancer group ranging from the brightest green (<0.1) to the brightest red (>10). Abbreviation: OCCC, ovarian clear cell carcinoma; EM, endometrioma; EOC_CC_E, early-stage OCCC; and EOC_CC_A, advanced-stage OCCC.