In the p53 mutation database established by IARC, p53 mutation at codon 280 (R280T) was found in tumors originating from 30 types of human tissues such as bladder, breast, nasopharynx, accessory sinus and mouth larynx, and in a few tumor cell lines such as NPC, bladder carcinoma, breast carcinoma, gastric, and esophageal cancer cell lines (10). The gene discussed is TP53; the disease is breast carcinoma.