Nuclear p53 Immunoreaction Associated with Poor Prognosis of Breast Cancer

p53 protein has been frequently detected at high levels in the nuclei of human breast cancer cells. We analyzed inununohistochemically the association between nuclear localization of p53 protein and clinical and histological parameters of breast cancer patients. Surgically resected tissues of 73 primary breast cancers were processed by acetone fixation and paraffin embedding and examined using an anti‐p53 monoclonal antibody, Pabl801. p53 immunoreactivity was detected in the nuclei of cancer cells in 17 cases (23%). The nuclear p53 immunoreaction was closely associated with overexpression of c‐erbB‐2 protein (P