Staining of the tumor tissues with the proliferation marker Ki67 revealed 41.2 ± 0.5% positive cells (n = 3) in MSC + SK-OV-3 co-injected tumors as compared to 31.3 ± 3.6% in SK-OV-3-induced tumors alone (Fig. 2a, lower panel, Fig. 2b). The gene discussed is MKI67; the disease is neoplasm.