The same effect of the Hsp90 inhibitors, namely the delay in post-radiation formation/disappearance of γH2AX foci, took place in other cell cultures which became radiosensitized as a result of the inhibitory pretreatments such as HeLa, KTC-1, PC-3, Myc-CaP and HT 1080 cancer cells, or actively proliferating vascular endothelial cells. Here, MYC is linked to cancer.