ERBB2 and cancer: However, subdividing the patients according to the molecular subtype of their cancer (Luminal, Her2 enriched, and basal-like), we detected significant differences of Ki-67 between those groups: Ki-67 values of triple negative cancers were 60.4 ± 18.3%, Her-2 positive cancers were 25.4 ± 12.6%, and luminal tumors 22 ± 19.5% (P < 0.0001).