The expression of Ki67, M30, and the more well-known terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay can also help us to determine whether tumor cells are in a dormant state from the perspective of apoptosis, in addition to the pERK/p38 ratio, which directly reflects the status of DTCs. The gene discussed is MKI67; the disease is neoplasm.