Other BC treatments being explored include cyclin-dependent kinase 4/6 (CDK 4/6) inhibitors, microRNAs (miRNAs), immunotherapy, clustered regularly interspaced short palindromic repeats (CRISPR), tyrosine kinase inhibitors (TKIs), PI3K inhibitors, drug repurposing, electrochemotherapy, surgery, and nanotechnology [9,10]. This evidence concerns the gene PIK3CA and breast cancer.