Figure 4

TUNEL staining of PC3 xenografts Mice bearing bilateral PC3 xenografts were untreated or treated with doxorubicin (i.p.) before receiving intratumoral injections of 500 μg Apo2L/TRAIL (left) or vehicle (right). After 24 hours, tumors were harvested, fixed, processed and analysed for TUNEL staining. Data shown are the mean ± SEM calculated from TUNEL positive cells counted in four fields.