NCIt definition : A breast carcinoma characterized by the presence of multiple cancerous tumors that
originate from different clones and are usually located in different quadrants of
the breast.;
Alternative definition : NCI-GLOSS: Breast cancer in which there is more than one tumor, all of which have
formed separately from one another. The tumors are likely to be in different quadrants
(sections) of the breast. Multicentric breast cancers are rare.;