Owing to its function in controlling the cellular homeostasis of cancer-related proteins such as B-Raf (protein kinase encoded by the BRAF gene), CDK4, and v-src (tyrosine kinase encoded by the v-Src gene), Hsp90 has emerged as a promising target for anti-cancer drug development (Garg et al., 2016, Prodromou, 2009, Sidera and Patsavoudi, 2014). This evidence concerns the gene CDK4 and cancer.