PMID: 11333292May 3, 2001Paper

p53 missense mutations in microdissected high-grade ductal carcinoma in situ of the breast

Journal of the National Cancer Institute
Susan J DoneI L Andrulis

Abstract

To understand the role of sporadic mutations in the tumor suppressor gene p53 (also known as TP53) in the pathogenesis of breast cancer, it is important to identify at which histologic stage such mutations first occur. We previously showed that a p53 mutation present in invasive breast cancer was found in all surrounding areas of ductal carcinoma in situ (DCIS) but not in areas of hyperplasia or normal breast epithelium. In the present investigation, we studied patients with DCIS, but without invasive breast cancer, to determine the spectrum of DCIS types that can harbor a p53 mutation. Formalin-fixed, paraffin-embedded tissues from 94 patients with DCIS were evaluated histologically for the predominant cellular architectural pattern, degree of necrosis, and nuclear grade. Each specimen was also assigned an overall histologic grade (with the use of the Van Nuys Prognostic Index pathologic classification). Tissue specimens were stained immunohistochemically with an anti-p53 antibody. Positively stained tissue areas were analyzed for the presence of p53 mutations by single-strand conformation polymorphism and direct sequencing. All statistical tests were two-sided. DCIS from 10 of 94 patients were found to contain p53 missense mu...Continue Reading

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