In model 3, higher parity (number of complete or full-term pregnancies, receptor subtype [luminal B, HER2 enriched and Triple Negative subtypes] and taking more than 3 months from identifying the BC problem to first health system entry (OR = 1.66 (95% CI: 1.38–2.00))), were associated with late-stage diagnosis, even when both health system- and socio-economic-level factors were taken into account. The gene discussed is ERBB2; the disease is breast cancer.