MKI67 and neoplasm: The patient and tumor characteristics that showed the strongest evidence for association with pN0 were pathological tumor size (p <0.001), mode of tumor detection (p <0.001), multifocality (p <0.001), vascular invasion (p <0.001), Ki67 (p <0.001), histological grade (p=0.007), age (p=0.027), and histological type (p=0.046).