Table 5.

Example of isotope interference from a previous analysis of the prostate cancer, 20% fraction data, without using age as a covariate

Mass	Δ (%)	P-value (× 10−3)	N
1645.580	58.07	18.119	127
1646.586	56.51	16.372	127
1647.576 *	−37.65	3.571	127
1648.581	−38.94	2.807	127
1649.589	−40.48	3.040	127
1650.597	−41.89	2.094	127
1651.605	−35.72	3.905	127

Those marked with an asterisk represents known glycans. Isotope-detection software initially categorized this as one long isotope sequence, although it clearly consists of two overlapping isotope sequences. See Section 4.