Fig. 5.
Growth of murine tumors after intravenous injection of either pCMV-TK (□) or pEGFP-C1 (▲)-loaded microbubbles and treated with ultrasound. Daily GCV injections began on day 3. Best-fit lines were calculated from all data points in each group assuming an exponential growth curve (TK R2 = 0.94; GFP R2 = 0.91).