Transcript Cancer
Cancer- uncontrollable growth of abnormal cells Body’s cells are constantly growing and dividing Most new cells are normal but some are not TumorAbnormal mass of tissue that has no natural role in the body Some are benign- noncancerous Do not spread Can be harmful if they interfere with normal body functions Ex block blood supply Tumors that are malignant, cancerous, spread to other tissues and spread through blood and lymph Metastasis- the spread of cancer from the point where it started to other parts of the body Cancer cells can kill normal body cells They compete for nutrients with the body’s cells Lymphomas- cancers of the immune system Leukemias- cancer of blood forming organs Carcinomas- cancer of glands and body lining Includes skin and line of digestive tract Sarcomas- cancer of connective tissue Bones, ligaments, and muscle Most common organs affected are Skin, Breast, Prostate, Lung, Colon, Mouth, Cervix A faulty gene may be inherited (5-10% of caner is inherited) Majority of cancer is caused by exposure to risk factors Carcinogen- cancer causing substance Ex cig. Smoke and ultraviolet rays Tobacco use is the major cause of cancer deaths and the most preventable Second hand smoke Also increases risk of bladder, pancreas, and kidney cancer 43 different carcinogens have been identified in tobacco and tobacco smoke Smokeless tobacco- causes oral cancer which affects the lips, mouth, and throat Kills 1 person every hour Human Papillomavirus (HPV) causes cervical cancer Hepatitis B causes liver cancer Reduce risk of these by abstaining from sexual contact Diets high in fat and low in fiber linked with cancer Fats make colon cells divide more rapidly which increases risk of cancer cells Fiber speeds the movement of waste through the intestines so carcinogens have less time to act on cells UV rays from sun or tanning bed= main cause of skin cancer A tan is the body’s response to being injured by UV rays Avoid tanning beds! Limit time in the sun if possible esp. between 10:00 AM- 4:00 PM When outside where sunscreen or long sleeves Pay attention to changes to skin ABCDs of melanoma Asymmetry (an imaginary line drawn through center of a mole does not produce matching halves) Border Irregularity- Suspect moles have irregular edges (not smooth) Color- intensely black, blush tint, or uneven color Diameter- wider than a pea Abstaining from sexual contact Be physically active Eat nutritious foods- fruits, vegetables, fiber, low in fat Protect skin from UV rays Avoid tobacco and alcohol (increases risk of stomach and mouth cancer) Be aware of warning signs Changes in bowel habits (loose stools or constipation) Sore throat that does not heal Unusual bleeding or discharge Lump in breast Difficulty swallowing Obvious change in moles Nagging cough or hoarseness Early detection of cancer is most critical factor in successful cancer treatment Self examination Medial screening Biopsy- the removable of a small piece of tissue for examination to determine if cancer was present Depends on type of cancer of how much it has spread Surgery- removes cancerous tumors Radiation therapy- radioactive rays kills cells and shrinks cancerous mass Chemotherapy- uses chemicals to destroy the cells Immunotherapy- activates immune system to recognize cancer cells and destroy them Hormone Therapy- using medicine that interferes with the production of hormones Remission- a period of time when symptoms disappear When cancer responds to treatment Can reoccur