Definition of "ductal" [ductal]

• Of, relating to, or originating in a duct (adjective)

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• "Most breast cancers in either men or women are breast cancers that we call ductal cancers, cancers that begin in the milk duct."
• "Some early, noninvasive breast cancers, known as ductal carcinoma in situ DCIS, never progress to dangerous cases, Griffin acknowledged, and mammogram detection may provoke aggressive treatment that ultimately is unnecessary or harmful."
• "That emphasis has led to significant increases in the incidence of a precancerous condition known as ductal carcinoma in situ, or DCIS the incidence increased seven-fold between 1980 and 2007."