Cancer is defined as malignant overgrowth of abnormal cells which tend to proliferate in an uncontrolled fashion, spread from the original site, invade, and metastasize nearby tissues. Giving the importance of an early diagnosis for the positive outcome, efforts has been focused not only in developing new and more effective treatments, but also in learning more about the pathogenesis of different type of cancers and main players involved, and improving the diagnostic techniques.
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