Tumours in younger patients (EOBC), were characterised by higher presence of DCIS (24.8% vs 21.6%), lower hormone-receptor positive status (52.30% vs 55.70%), higher proliferation index (Ki-67 > 20: 82.40% vs 80.30%) and higher likelihood of nodal involvement (13.80% vs 9.00%) though none of these adverse histopathological features was statistically significant. The gene discussed is MKI67; the disease is ductal breast carcinoma in situ.