the biodistribution at various time points showed increased tumor-to-muscle ratios after 99mtc-ap4a or 99mtc-atp injections when compared with a nonspecific marker of the extracellular fluid space , 99mtc-labeled diethylenetriaminepentaacetic acid and with an agent known to localize in some tumors , 67ga-labeled citrate .
C0013254
diethylenetriaminepentaacetic acid
C0027651
tumors