Microsoft PowerPoint - Cancer 250 S08

Microsoft PowerPoint - Cancer 250 S08 - What is Cancer?...

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1 Cancer Prevention and treatment What is Cancer? s Abnormal, uncontrolled growth of cells s Every case of cancer begins as a change in a cell that allows it to grow and divide when it should not Cancer Cell Growth s Can form tumors, and/or travel via the blood system/lymph system s Metastasis How Cancer Spreads or Metastasizes Benign versus Malignant s Benign tumor (slow growing, not cancerous) s Malignant tumor or neoplasm (fast growing, cancerous)
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2 Classifying Cancers s Cancers are classified according to the tissue in which they originate called the primary site s Tumors are graded on the basis of the degree to which the tumor cells resemble healthy cells s low grade (grade I) to a high grade (grade IV) s The stage of the disease s Two systems of staging: s 5 categories (0 to stage 4 based on the cancer layers of cells) s TNM (tumors, nodes, metastasis ratings from 0-4) Types of Cancer s Four broad types of cancer are distinguished: s Carcinomas (epithelial tissue, including the skin, surface of body organs, outer portion of
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Microsoft PowerPoint - Cancer 250 S08 - What is Cancer?...

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