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Download Cancer - Helena High School
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Cancer Cell Division Gone Wrong! •Cancer is not just one disease, but many diseases – over 200 different types of cancers Types of Cancer Most common types of cancers in males include lung, prostate, colorectal, and stomach The most common types in females include lung cancer, breast cancer, cervical cancer. Most common cancers often have routine screening- colon, prostate, breast Some cancers are more deadly than others. Pancreatic cancer kills 96% if those diagnosed – deadly because of lack of symptoms. Often too advanced when discovered. Cell Cycle Normal body cells grow, divide and die in an orderly fashion Cyclins cycle are proteins that control the cell PART 2 – CANCER Cell Repair Checkpoints Fail…then 2 fates if a cell cannot repair itself Autolysis or apoptosis is the last resort to prevent a cell from getting out of control Cancer – if DNA damage interferes with cell death or encourages out-ofcontrol cell division Tumor – solid growth or mass of cells Cell Division Control • DNA controls all cell activities including cell division • Oncogenes promote cell growth and tumor suppressor genes inhibit cell division and survival. • Some cells lose their ability to control their rate of cell division – the DNA of these cells has become damaged or changed (mutated) • These super-dividing cells form masses called tumors Tumors A large ductal carcinoma In a mastectomy specimen Examples of Carcinogens Chemicals – radon gas, cigarettes, formaldehyde, asbestos, mustard gas, benzene and many others (CDC lists approximately 1,000 potential carcinogens Radiation – UV rays for the sun, sunlamps, X-rays, Viruses – Human Papillomavirus (HPV)- causes cervical, vaginal, penile, and certain head and neck cancers, Epstein-Barr (mononucleosis) linked to lymphoma (cancer of the lymph nodes), Hepatitis B and C (liver cancer) •Benign tumors are not cancerous – these cells do not spread to other parts of the body •Malignant tumors are cancerous – these cells break loose and can invade and destroy healthy tissue in other parts of the body (called metastasis) •Carcinogen is a cancer causing agent CANCER WARNING SIGNS Changes in bowel or bladder habits Sore that will not heal Unusual bleeding Thickening or a lump in the breast or somewhere else Chronic indigestion Obvious change in a mole Nagging cough Also look for extreme tiredness, weight loss, fever and sometimes pain Diagnosis of Cancer Cells Patient History- MRI, X-rays, ultrasounds to “look” inside the body to identify location and size of tumor Biopsy is performed- removal of sample tissue for a specialist to check for cancer cells- look for abnormalities. Determine if the cancer has spread to other organsmetastasis of malignant tumor. - blood or lymph testing can indicate spread of cancer – if cancer cells are present Patients will visit and oncologist- doctor who examines tissue for diseases like cancer Remission – period of time when the cancer is responding to treatment or is under control STAGING OF CANCER Generally, the lower the stage, the less advanced the cancer is and the better the treatment outcome is likely to be. Stage 0 = precancer Stage 1 = small cancer found only in the organ where it started Stage 2 = larger cancer that may or may not have spread to the lymph nodes Stage 3 = larger cancer that is also in the lymph nodes Stage 4 = cancer in a different organ from where it started SKIN CANCERS Most common types include squamous cell and basal cell carcinoma (both benign) and melanoma (malignant) 3.5 million cases of basal and squamous cell carcinomas each year in the U.S. Approximately 73,000 cases of melanoma each year in the U.S.- w/ about 10,000 deaths Approximately 800,000 deaths each year from melanoma. ABCDE RULES FOR MOLES Study of Telomers Telomeres are caps on the ends of chromosomes http://www.youtube.com/watch?v=wRrNjHYxP_o http://www.bbc.co.uk/blogs/adamcurtis/2010/06/the_undead_henrietta_lack s_and.html Proteus Syndrome: Elephant Man http://io9.com/10-unusual-genetic-mutations-in-humans-470843733
