twenty-nine rabbits with 12- to 14-day-old vx2 tumors in the hind leg were injected intraarterially with technetium-99m ( 99mtc ) dtpa and various combinations of biodegradable starch microspheres , spherex ( pharmacia , sweden ) , to evaluate the efficacy of the microspheres in enhancing tumor retention of 99mtc dtpa .
C0027651
tumor
C0013254
dtpa