High levels of α9 expression are associated with advanced stages (III and IV) of breast tumors, and also with increased tumor metastasis and growth, and increased resistance to apoptosis, especially in triple‐negative breast cancer (TNBC) cell lines like MDA‐MB‐231 and MCF‐7 [66, 67]. The gene discussed is IGKV1D-22; the disease is neoplasm.