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NCI Dictionary of Cancer Terms


hyperplasia  listen  (HY-per-PLAY-zhuh)

  An increase in the number of cells in an organ or tissue. These cells appear normal under a microscope. They are not cancer, but may become cancer.

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Drawing of four panels showing how normal cells may become cancer cells. The first panel shows normal cells. The second and third panels show abnormal cell changes called hyperplasia and dysplasia. The fourth panel shows cancer cells.