Rectal cancer types, Documente utile


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Cancer—a definition. Term represents a group of more than neoplastic diseases that involve all body organs. One or more cells lose their normal growth rectal cancer types mechanism and continue to grow uncontrolled. They tend to rectal cancer types surrounding tissue and to metastasize to distant body sites.

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Second leading cause of death rectal cancer types United States after heart disease. Ranks fourth for males and first for females as cause of death; second after accidents as cause of death for children. Greatest increase seen in lung cancer—consistent with smoking patterns. Incidence rate. It is predicted that the incidence of cancer in the United States could double by the middle of the century, due to growth and aging of population.

Leading causes of cancer death are lungs, prostate, and colorectal for males; lungs, breast, and colorectal for females. Most common site of cancer for a female is the cervix.

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Steps in controlling cancer: Educate the public and professional people about cancer. Encourage methods of primary prevention. Carcinogens: agents known to increase susceptibility to cancer. Chemical carcinogens: asbestos, benzene, vinyl chloride, by-products of tobacco, arsenic, cadmium, nickel, radiation, and mustard gas.

Rectal cancer histopathology

Iatrogenic chemical agents: diethylstilbestrol DES ; chemotherapy; hormone treatment; immunosuppressive agents, radioisotopes, cytotoxic drugs. Radiation carcinogens: x-rays; sunlight ultraviolet light ; nuclear radiation. Viral factors: herpes simplex; Epstein—Barr; hepatitis B, and retroviruses. Genetic factors: hereditary or rectal cancer types tendencies.

Demographic and geographic factors. Dietary factors: obesity; high-fat diet; diets low in fiber; diets high in smoked or salted foods; preservatives and food additives; alcohol.

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Psychological factors: stress. Optimal dietary patterns and lifestyle changes. Increase total fiber rectal cancer types diet—decreases risk of colon cancer. Increase cruciferous vegetables cabbage, broccoli, carrots, Brussels sprouts. Increase vitamin A—reduced incidence of larynx, esophagus, and lung cancers. Increase vitamin Rectal cancer types tumor encapsulation and promotes longer survival time. Increase vitamin E—inhibits growth of brain tumors, melanomas, and leukemias.

Decrease alcohol consumption. Avoid salt—cured, rectal cancer types, or nitrate-cured foods. Minimize exposure to carcinogens. Avoid oral tobacco—increases incidence of oral cancers.

Avoid exposure to asbestos fibers and constant environmental dust. Avoid exposure to chemicals.

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Avoid radiation exposure and excessive exposure to sunlight. Obtain adequate rest and exercise to decrease stress. Chronic stress associated with decreased immune system functioning. Strong immune system responsible for destruction of developing malignant cells. Participate in a regular exercise program.

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Get adequate rest 6—8 hours per night. Have a physical exam on a regular basis, including recommended diagnostic tests. Risk assessment see Identified Causes and Risk Factors, p. Health history and physical assessment.

Screening methods. Mammography, Pap test, prostate exam, prostate- specific antigen PSA blood test, etc. Self-care practices: breast self-examination BSE done every month on a regular time schedule; testicular self-examination TSE done every month; skin inspection.

Colonoscopy for males and females 50 years and older.

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Fecal occult blood test for males and females 40 years and older. Characteristics A. Benign neoplasms: usually encapsulated, remain localized, and are slow growing.

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Malignant neoplasms: not encapsulated, will metastasize and grow, and exert negative effects on host. Categories of malignant neoplasms. Carcinomas—grown from epithelial cells; usually solid tumors skin, stomach, colon, breast, rectal. Sarcomas—arise from muscle, bone, fat, or connective tissue—may be solid. Lymphomas—arise from lymphoid tissue infection-fighting organs. Leukemias and myelomas—grow from bloodforming organs.

Mechanisms of metastases. Transport of cancer cells occurs through the lymph system and either the cells reside in lymph nodes or pass between venous and lymphatic circulation. Tumors that begin in areas of the body that have extensive lymph circulation are at high rectal cancer types for metastasis breast tissue. The speed of metastasis is directly related to the vascularity of the tumor.

Angiogenesis: Cancer cells induce growth of new capillaries; thus cells can spread through this network. Hematogenous: Cancer cells are disseminated through the bloodstream. The bloodstream may carry cells from one rectal cancer types to another liver to bone. Direct spread of cancer cells seeding where there are no boundaries to stop the growth e.

Colon and Rectal Cancer: How much of a problem is it really?

Transplantation is the transfer of cells from one site to another. Diagnostic studies will depend on suspected primary site and symptoms. Laboratory and radiologic tests often identify a problem first.

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Radiographic procedures e. Radioisotopic scanning studies e. Magnetic resonance imaging MRI. Biologic response markers useful for diagnosing primary tumors, a parameter used to measure the progress of disease or the effects of treatment.

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Positron emission tomography PET. Radioactive glucose is injected prior to scanning. Areas of high glucose uptake, such as rapidly dividing cancer cells, are dramatically displayed in the scam images.