Median time from BC diagnosis to the beginning of pregnancy was 48 months and was significantly associated with endocrine therapy (no endocrine therapy: 42 months versus endocrine therapy: 61 months, p < 0.001) and BC subtype (51.8 months for luminal tumors, 38.9 months for TNBC, 55.9 months for HER2-positive tumors and 37.4 months for in situ only tumors, respectively, p < 0.001). The gene discussed is ERBB2; the disease is breast cancer.