MKI67 and cancer: Figure 1 shows Kaplan–Meier estimate curves: for all patients (Fig. 1a), by tumor primary site (GEP versus non-GEP; Fig. 1b, log rank test p = 0.0073), by cancer stage (Fig. 1c, log rank test p = 0.0050), by quality of surgery (Fig. 1d, log rank test p < 0.0001), by serum CgA concentration (Fig. 1e) and by Ki67 index (Fig. 1f).