qRT-PCR analysis of pro-apoptotic genes. The bars show the increase in gene expression in Epo- compared to placebo-treated tumours measured after A. 1 h (P < 0.0001), B. 12 h (P = 0.0005), C. 24 h (P = 0.0003), D. 48 h (P = 0.66), and E. 72 h (P = 0.20). The influence of Epo was analysed by 2-way ANOVA. Error bars represent SEM.