ADSS2 and colorectal carcinoma: decrease in the levels of Pyx, Oro, AdeH, Pya, Glyc, β-Leu,MetCy, Tau, 3-HB, AcChol, 3-HV, Fuc, Chol, and PCar and increase inGly in CRC samples; the LDA/DCA ratio is considered a possible CRCbiomarker