Regarding BC stage, patients with stage 1 had a mean BRCA1 gene expression of 33.47 ± 2.49, while those with stages 2, 3, and 4 exhibited mean expressions of 36.57 ± 4.54, 39.50 ± 4.90, and 38.55 ± 0.01, respectively. The gene discussed is BRCA1; the disease is breast cancer.