A lesion from which a malignant neoplasm is believed to develop in a significant number of instances, and which may or may not be recognizable clinically or by microscopic changes in the affected tissue.
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pre·can·cer .prē-'kan(t)-sər n a precancerous lesion or condition <one \precancer called actinic keratosis often disappears after a few weeks of...treatment (Elizabeth Morgan)>
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pre·can·cer (preґkan-sər) a condition that tends eventually to become malignant. precancerous adjMedical dictionary. 2011.