HCFC1 and neoplasm: However, the quantification of the fluorescence intensity of MCF7 cells at the xenograft site showed that, despite the high mortality observed for the cells throughout the experiments, the number of surviving cells was significantly higher in those fish xenotransplanted with hetCTC-C, indicating a possible regulatory effect of vCAF in tumour cell survival as early as 24 h after xenotransplantation (Figures 2B,C).