Table 1.

Percentage distribution of ¹³C-mass isotopomers of lactate in the plasma of human lung cancer patients infused with [U-¹³C]-glucose for 3 h^A

	lactate+1B	lactate+2B	lactate+3B
#6	0.80%	0.36%	1.89%
#7	0.00%	1.83%	4.84%
#8	2.94%	0.16%	3.31%
#9	0.00%	4.11%	3.47%
#10	2.01%	1.00%	6.37%

^A Values in excess of natural abundance as determined from GC-MS analysis

^B Lactate+1, 2, 3 respectively refer to lactate with one, two, and three carbons labeled in ¹³C.