The RIF-1 tumours grew in all the mice but again the rate of growth of RIF-1 cells in mice cured of RIF-1 EGFP tumours by PDT was significantly slower than the rate in naïve mice (P<0.001 by comparing slopes of logarithmic transformed data) than in naïve mice (Figure 7). The gene discussed is RIF1; the disease is neoplasm.