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Copyright © 2009 Pearson Education, Inc. Selected sections from Chapter 18 Cancer: Uncontrolled Cell Division and Differentiation Tumor Benign Malignant
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Copyright © 2009 Pearson Education, Inc. Table 18.1 Characteristics of Benign Tumors and Cancers
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Copyright © 2009 Pearson Education, Inc. Tumors Benign Remain in one location Single, well-defined mass May be surrounded by connective tissue Cancerous Abnormal cell structure; may appear undifferentiated May spread Edge of tumor not clearly defined
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Copyright © 2009 Pearson Education, Inc. Figure 18.2 Animation—Cancer Malignant Tumor Development PLAY
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Copyright © 2009 Pearson Education, Inc. How Cancer Develops Apoptosis Mutated or damaged genes Proto-oncogenes Normal regulatory genes Oncogenes Mutated or damaged proto-oncogenes Tumor suppressor genes Regulatory genes slow cell division, TS genes may be turned off, damaged, or mutated in cancers
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Copyright © 2009 Pearson Education, Inc. Factors Contributing to Cancer Viruses and bacteria Chemicals in the environment Tobacco Radiation Dietary factors Internal Factors Free Radicals
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Copyright © 2009 Pearson Education, Inc. Cancer Treatments Conventional treatments Surgery Radiation Chemotherapy
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Copyright © 2009 Pearson Education, Inc. Table 18.3 Ten Most Common Cancers
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Copyright © 2009 Pearson Education, Inc. Most Cancers Are Preventable Know family history Get regular medical screenings Learn self-examination techniques Avoid direct sunlight 10 a.m. to 4 p.m., sunlamps, and tanning salons Watch diet and weight Don’t smoke Drink in moderation, if at all Be informed
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