An antitumor efficacy study was conducted in which parallel groups of immunocompetent and immunosuppressed hamsters were treated with intratumoral injections of VRX-007, wild-type adenovirus serotype 5 (Ad5), or vehicle. In this study, the first dose of CP was given on day −4 and was followed by twice weekly CP dosing throughout the study. Intratumoral oncolytic Ad (or vehicle) injections were administered on days 0, 1, 2, 4–6. The tumor suppression data are shown in Figure 2. Blood was collected and hematological analysis was performed on days −4, 8, 20, and 34 to monitor immunosuppression. The counts of total white blood cells (a), neutrophils (b), lymphocytes (c), and monocytes (d) are shown. No basophils were observed. The data are shown as the mean of each treatment group, ±SEM, n = 6/group. The legend for all panels is shown in a.