- 1- to 2-day hospitalization at the start of the study for biopsies and blood measurements to determine the level of AZD2171 in the bloodstream. Blood is drawn immediately before the first dose, and 0.25 hr, 0.5 hr, 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 12 hr, 24 hr, and 48 hours after the dose is taken.