While bone represents the most common site for metastasis across all breast cancer subtypes, TNBC demonstrates a heightened inclination toward lung metastasis, affecting approximately 32% of TNBC patients, in contrast to around 21% in luminal A/B and 25% in human epidermal growth factor receptor 2 (HER2)-positive cases [8]. The gene discussed is ERBB2; the disease is breast cancer.