Per the World Health Organization, Ki‐67 is an important prognosticating factor; estimated by microscopic examination of tumor cells and counting the number of Ki‐67 positive cells, an index of < 3% is associated with a Grade 1 (G1) tumor, 3%–20% is Grade 2 (G2), and > 20% is Grade 3 (G3) [20, 21]. The gene discussed is MKI67; the disease is neoplasm.