Table 1A.

¹³C fractional enrichments of GLU C4 in the tumors. Calculation of a–e are from ¹³C NMR spectra of C4 GLU as described in the text (Materials and Methods). d and e correspond to the fractions that have [4,5-¹³C] and [3,4,5-¹³C] isotopomers respectively. a is the fraction that has no ¹³C. (b+c) together represents the contributions from the metabolism of [1,2-¹³C]acetate by peripheral organs to tumor GLU C4 ¹³C pool. FE is equal to (b+c+d+e) and corresponds to fractional enrichment of GLU C4 in the tumor.

Tumor type	a	b	c	d	e	FE	(b+c)/FE	(d+e)/FE
GBM	0.758	0.014	0.002	0.188	0.038	0.242	0.066	0.934
GBM	0.717	0.024	0.003	0.222	0.035	0.283	0.094	0.906
Breast metastasis	0.537	0.017	0.006	0.354	0.087	0.464	0.050	0.950
Lung metastasis	0.554	0.019	0.006	0.339	0.083	0.446	0.056	0.944