Proliferative activity in the outgrowth of non-neoplastic epithelial cells (median Ki67-index: < 1% at 24 h, 6% at 72 h, 5% at 96 h) was much lower than in the cancer cells (median Ki67-index: 31% at 24 h, 17% at 72 h, 26% at 96 h; p ≤ 0.0001) and remained stable over time. The gene discussed is MKI67; the disease is cancer.