Posts Tagged ‘cancer’

Tabacco Facts

Saturday, March 26th, 2011

Tobacco use is the leading cause of preventable illness and death in the United States. It causes many different cancers as well as chronic lung diseases, such as emphysema and bronchitis, and heart disease.

  • Cigarette smoking causes an estimated 443,000 deaths each year, including approximately 49,400 deaths due to exposure to secondhand smoke.
  • Lung cancer is the leading cause of cancer death among both men and women in the United States, and 90 percent of lung cancer deaths among men and approximately 80 percent of lung cancer deaths among women are due to smoking.
  • Smoking causes many other types of cancer, including cancers of the throat, mouth, nasal cavity, esophagus, stomach, pancreas, kidney, bladder, and cervix, and acute myeloid leukemia.
  • People who smoke are up to six times more likely to suffer a heart attack than nonsmokers, and the risk increases with the number of cigarettes smoked. Smoking also causes most cases of chronic lung disease.
  • In 2009, approximately 20.6 percent of U.S. adults were cigarette smokers.
  • Nearly 20 percent of high school students smoke cigarettes.

Cancer – Risk Factors

Saturday, March 26th, 2011

Doctors often cannot explain why one person develops cancer and another does not. But research shows that certain risk factors increase the chance that a person will develop cancer. These are the most common risk factors for cancer:

Growing older
Tobacco
Sunlight
Ionizing radiation
Certain chemicals and other substances
Some viruses and bacteria
Certain hormones
Family history of cancer
Alcohol
Poor diet, lack of physical activity, or being overweight


Many of these risk factors can be avoided. Others, such as family history, cannot be avoided. People can help protect themselves by staying away from known risk factors whenever possible.

If you think you may be at risk for cancer, you should discuss this concern with your doctor. You may want to ask about reducing your risk and about a schedule for checkups.

Over time, several factors may act together to cause normal cells to become cancerous. When thinking about your risk of getting cancer, these are some things to keep in mind:

  • Not everything causes cancer.
  • Cancer is not caused by an injury, such as a bump or bruise.
  • Cancer is not contagious. Although being infected with certain viruses or bacteria may increase the risk of some types of cancer, no one can “catch” cancer from another person.
  • Having one or more risk factors does not mean that you will get cancer. Most people who have risk factors never develop cancer.
  • Some people are more sensitive than others to the known risk factors.

Growing Older

The most important risk factor for cancer is growing older. Most cancers occur in people over the age of 65. But people of all ages, including children, can get cancer, too.
Tobacco

Tobacco use is the most preventable cause of death. Each year, more than 180,000 Americans die from cancer that is related to tobacco use.

Using tobacco products or regularly being around tobacco smoke (environmental or secondhand smoke) increases the risk of cancer.

Smokers are more likely than nonsmokers to develop cancer of the lung, larynx (voice box), mouth, esophagus, bladder, kidney, throat, stomach, pancreas, or cervix. They also are more likely to develop acute myeloid leukemia (cancer that starts in blood cells).

People who use smokeless tobacco (snuff or chewing tobacco) are at increased risk of cancer of the mouth.

Quitting is important for anyone who uses tobacco – even people who have used it for many years. The risk of cancer for people who quit is lower than the risk for people who continue to use tobacco. (But the risk of cancer is generally lowest among those who never used tobacco.)

Also, for people who have already had cancer, quitting may reduce the chance of getting another cancer.

Sunlight

Ultraviolet (UV) radiation comes from the sun, sunlamps, and tanning booths. It causes early aging of the skin and skin damage that can lead to skin cancer.

Doctors encourage people of all ages to limit their time in the sun and to avoid other sources of UV radiation:

It is best to avoid the midday sun (from mid-morning to late afternoon) whenever possible. You also should protect yourself from UV radiation reflected by sand, water, snow, and ice. UV radiation can penetrate light clothing, windshields, and windows.
Wear long sleeves, long pants, a hat with a wide brim, and sunglasses with lenses that absorb UV.
Use sunscreen. Sunscreen may help prevent skin cancer, especially sunscreen with a sun protection factor (SPF) of at least 15. But sunscreens cannot replace avoiding the sun and wearing clothing to protect the skin.
Stay away from sunlamps and tanning booths. They are no safer than sunlight.

Protect yourself from the sun.
Ionizing Radiation

Ionizing radiation can cause cell damage that leads to cancer. This kind of radiation comes from rays that enter the Earth’s atmosphere from outer space, radioactive fallout, radon gas, x-rays, and other sources.

Radioactive fallout can come from accidents at nuclear power plants or from the production, testing, or use of atomic weapons. People exposed to fallout may have an increased risk of cancer, especially leukemia and cancers of the thyroid, breast, lung, and stomach.

Radon is a radioactive gas that you cannot see, smell, or taste. It forms in soil and rocks. People who work in mines may be exposed to radon. In some parts of the country, radon is found in houses. People exposed to radon are at increased risk of lung cancer.

Medical procedures are a common source of radiation:

Doctors use radiation (low-dose x-rays) to take pictures of the inside of the body. These pictures help to diagnose broken bones and other problems.
Doctors use radiation therapy (high-dose radiation from large machines or from radioactive substances) to treat cancer.
The risk of cancer from low-dose x-rays is extremely small. The risk from radiation therapy is slightly higher. For both, the benefit nearly always outweighs the small risk.

You should talk with your doctor if you are concerned that you may be at risk for cancer due to radiation.

If you live in a part of the country that has radon, you may wish to test your home for high levels of the gas. The home radon test is easy to use and inexpensive. Most hardware stores sell the test kit.

You should talk with your doctor or dentist about the need for each x-ray. You should also ask about shields to protect parts of the body that are not in the picture.

Cancer patients may want to talk with their doctor about how radiation treatment could increase their risk of a second cancer later on.

Certain Chemicals and Other Substances

People who have certain jobs (such as painters, construction workers, and those in the chemical industry) have an increased risk of cancer. Many studies have shown that exposure to asbestos, benzene, benzidine, cadmium, nickel, or vinyl chloride in the workplace can cause cancer.

Follow instructions and safety tips to avoid or reduce contact with harmful substances both at work and at home. Although the risk is highest for workers with years of exposure, it makes sense to be careful at home when handling pesticides, used engine oil, paint, solvents, and other chemicals.

Some Viruses and Bacteria

Being infected with certain viruses or bacteria may increase the risk of developing cancer:

Human papillomaviruses (HPVs): HPV infection is the main cause of cervical cancer. It also may be a risk factor for other types of cancer.
Hepatitis B and hepatitis C viruses: Liver cancer can develop after many years of infection with hepatitis B or hepatitis C.
Human T-cell leukemia/lymphoma virus (HTLV-1): Infection with HTLV-1 increases a person’s risk of lymphoma and leukemia.
Human immunodeficiency virus (HIV): HIV is the virus that causes AIDS. People who have HIV infection are at greater risk of cancer, such as lymphoma and a rare cancer called Kaposi’s sarcoma.
Epstein-Barr virus (EBV): Infection with EBV has been linked to an increased risk of lymphoma.
Human herpesvirus 8 (HHV8): This virus is a risk factor for Kaposi’s sarcoma.
Helicobacter pylori : This bacterium can cause stomach ulcers. It also can cause stomach cancer and lymphoma in the stomach lining.
Do not have unprotected sex or share needles. You can get an HPV infection by having sex with someone who is infected. You can get hepatitis B, hepatitis C, or HIV infection from having unprotected sex or sharing needles with someone who is infected.

You may want to consider getting the vaccine that prevents hepatitis B infection. Health care workers and others who come into contact with other people’s blood should ask their doctor about this vaccine.

If you think you may be at risk for HIV or hepatitis infection, ask your doctor about being tested. These infections may not cause symptoms, but blood tests can show whether the virus is present. If so, the doctor may suggest treatment. Also, the doctor can tell you how to avoid infecting other people.

If you have stomach problems, see a doctor. Infection with H. pylori can be detected and treated.

Certain Hormones

Doctors may recommend hormones (estrogen alone or estrogen along with progestin) to help control problems (such as hot flashes, vaginal dryness, and thinning bones) that may occur during menopause. However, studies show that menopausal hormone therapy can cause serious side effects. Hormones may increase the risk of breast cancer, heart attack, stroke, or blood clots.

A woman considering menopausal hormone therapy should discuss the possible risks and benefits with her doctor.

Diethylstilbestrol (DES), a form of estrogen, was given to some pregnant women in the United States between about 1940 and 1971. Women who took DES during pregnancy may have a slightly higher risk of developing breast cancer. Their daughters have an increased risk of developing a rare type of cancer of the cervix. The possible effects on their sons are under study.

Women who believe they took DES and daughters who may have been exposed to DES before birth should talk with their doctor about having checkups.

Family History of Cancer

Most cancers develop because of changes (mutations) in genes. A normal cell may become a cancer cell after a series of gene changes occur. Tobacco use, certain viruses, or other factors in a person’s lifestyle or environment can cause such changes in certain types of cells.

Some gene changes that increase the risk of cancer are passed from parent to child. These changes are present at birth in all cells of the body.

It is uncommon for cancer to run in a family. However, certain types of cancer do occur more often in some families than in the rest of the population. For example, melanoma and cancers of the breast, ovary, prostate, and colon sometimes run in families. Several cases of the same cancer type in a family may be linked to inherited gene changes, which may increase the chance of developing cancers. However, environmental factors may also be involved. Most of the time, multiple cases of cancer in a family are just a matter of chance.

If you think you may have a pattern of a certain type of cancer in your family, you may want to talk to your doctor. Your doctor may suggest ways to try to reduce your risk of cancer. Your doctor also may suggest exams that can detect cancer early.

You may want to ask your doctor about genetic testing. These tests can check for certain inherited gene changes that increase the chance of developing cancer. But inheriting a gene change does not mean that you will definitely develop cancer. It means that you have an increased chance of developing the disease.

Alcohol

Having more than two drinks each day for many years may increase the chance of developing cancers of the mouth, throat, esophagus, larynx, liver, and breast. The risk increases with the amount of alcohol that a person drinks. For most of these cancers, the risk is higher for a drinker who uses tobacco.

Doctors advise people who drink to do so in moderation. Drinking in moderation means no more than one drink per day for women and no more than two drinks per day for men.

Poor Diet, Lack of Physical Activity, or Being Overweight

People who have a poor diet, do not have enough physical activity, or are overweight may be at increased risk of several types of cancer. For example, studies suggest that people whose diet is high in fat have an increased risk of cancers of the colon, uterus, and prostate. Lack of physical activity and being overweight are risk factors for cancers of the breast, colon, esophagus, kidney, and uterus.

Choose a diet rich in fruits and vegetables.

Having a healthy diet, being physically active, and maintaining a healthy weight may help reduce cancer risk. Doctors suggest the following:

Eat well: A healthy diet includes plenty of foods that are high in fiber, vitamins, and minerals. This includes whole-grain breads and cereals and 5 to 9 servings of fruits and vegetables every day. Also, a healthy diet means limiting foods high in fat (such as butter, whole milk, fried foods, and red meat).
Be active and maintain a healthy weight: Physical activity can help control your weight and reduce body fat. Most scientists agree that it is a good idea for an adult to have moderate physical activity (such as brisk walking) for at least 30 minutes on 5 or more days each week.

What is Cancer Screening?

Saturday, March 26th, 2011

Cancer screening is looking for cancer before a person has any symptoms.

Screening tests can help find cancer at an early stage, before symptoms appear. When abnormal tissue or cancer is found early, it may be easier to treat or cure. By the time symptoms appear, the cancer may have grown and spread. This can make the cancer harder to treat or cure.

It is important to remember that when your doctor suggests a screening test, it does not always mean he or she thinks you have cancer. Screening tests are done when you have no cancer symptoms.

There are different kinds of screening tests.

Screening tests include the following:

Physical exam and history: An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken.
Laboratory tests: Medical procedures that test samples of tissue, blood, urine, or other substances in the body.
Imaging procedures: Procedures that make pictures of areas inside the body.
Genetic tests: Tests that look for certain gene mutations (changes) that are linked to some types of cancer.
Screening tests have risks.

Not all screening tests are helpful and most have risks. It is important to know the risks of the test and whether it has been proven to decrease the chance of dying from cancer.

Some screening tests cause serious problems.

Some screening procedures can cause bleeding or other problems. For example, colon cancer screening with sigmoidoscopy or colonoscopy can cause tears in the lining of the colon.

False-positive test results are possible.

Screening test results may appear to be abnormal even though there is no cancer. A false-positive test result (one that shows there is cancer when there really isn’t) can cause anxiety and is usually followed by more tests and procedures, which also have risks.

False-negative test results are possible.

Screening test results may appear to be normal even though there is cancer. A person who receives a false-negative test result (one that shows there is no cancer when there really is) may delay seeking medical care even if there are symptoms.

Finding the cancer may not improve the person’s health or help the person live longer.

Some cancers never cause symptoms or become life-threatening, but if found by a screening test, the cancer may be treated. There is no way to know if treating the cancer would help the person live longer than if no treatment were given. Also, treatments for cancer have side effects.

For some cancers, finding and treating the cancer early does not improve the chance of a cure or help the person live longer.

Basic Cancer Statistics

Thursday, March 24th, 2011

Rates of new diagnoses and rates of death from all cancers combined declined significantly in the most recent time period for men and women overall and for most racial and ethnic populations in the United States, according to a report from leading health and cancer organizations.

The drops are driven largely by declines in rates of new cases and rates of death for the three most common cancers in men (lung, prostate, and colorectal cancers) and for two of the three leading cancers in women (breast and colorectal cancer). New diagnoses for all types of cancer combined in the United States decreased, on average, almost 1 percent per year from 1999 to 2006. Cancer deaths decreased 1.6 percent per year from 2001 to 2006.

These findings are from a report authored by researchers from the National Cancer Institute (NCI), part of the National Institutes of Health, the Centers for Disease Control and Prevention (CDC), the American Cancer Society (ACS), and the North American Association of Central Cancer Registries (NAACCR). The report was published early online Dec. 7, 2009, in the journal Cancer.

Overall cancer rates continue to be higher for men than for women, but men experienced the greatest declines in incidence (new cases) and mortality (death) rates. For colorectal cancer, the third most frequently diagnosed cancer in both men and women, and the second leading cause of cancer deaths in the United States, overall rates are declining, but increasing incidence in men and women under 50 years of age is of concern, the report said.

Top 15 Cancer Sites for Men and Women
Cancer Type Men:
New Cases
Men:
Deaths
Women:
New Cases
Women:
Deaths
Bladder _ _ +0.2% +0.4%
Brain -0.5% -1.0% _ -1.1%
Breast -2.0% -1.9%
Cervix -3.5% _
Colon/rectum -3.0% -3.9% -2.2% -3.4%
Esophagus +0.7% +0.4%
Kidney +1.8% -1.5% +2.4% -0.6%
Leukemia +0.1% -0.8% +0.3% -1.6%
Liver +3.6% +2.4% +1.8%
Lung -1.8% -2.0% +0.4% _
Melanoma +3.1% +2.0% +3.0%
Myeloma +0.7% -1.1% -2.4%
Non-Hodgkin Lymphoma _ -3.0% +1.1% -3.7%
Oral -1.2% -2.2% -0.9%
Ovary -2.1% -1.4%
Pancreas _ _ +1.7% +0.1%
Prostate -2.4% -4.1%
Stomach -2.0% -3.7% -2.7%
Thyroid +6.3%
Uterus -0.5% _
Trends data are based on the most recent trends in rates and variable time periods. The “—” symbol indicates neither a statistically significant rise nor fall in the rates during the time period studies. Blank spaces indicate cancers that were not in the top 15 for that gender/category.

In the Special Feature section, the authors used modeling projections of colorectal cancer rates to find that, with accelerated cancer control efforts to get more Americans to adopt more favorable health behaviors (such as quitting smoking) and higher use of screening (such as colonoscopy), as well as optimal treatment outcomes for colorectal cancer (such as more effective chemotherapy), there could be an overall colorectal cancer mortality reduction of 50 percent by 2020.

Other highlights from the report show that in men, incidence rates have declined for cancers of the prostate, lung, oral cavity, stomach, brain, colon and rectum, but continue to rise for kidney/renal, liver, and esophageal cancer, as well as for leukemia, myeloma and melanoma. In women, incidence rates decreased for breast, colorectal, uterine, ovarian, cervical and oral cavity cancers, but increased for lung, thyroid, pancreatic, bladder, and kidney cancers, as well as for non-Hodgkin lymphoma, melanoma and leukemia.

“The continued decline in overall cancer rates documents the success we have had with our aggressive efforts to reduce risk in large populations, to provide for early detection, and to develop new therapies that have been successfully applied in this past decade,” said NCI Director John E. Niederhuber, M.D. “Yet we cannot be content with this steady reduction in incidence and mortality. We must, in fact, accelerate our efforts to get individualized diagnoses and treatments to all Americans and our belief is that our research efforts and our vision are moving us rapidly in that direction.”

Among racial/ethnic groups, cancer death rates were highest in black men and women and lowest in Asian/Pacific Islander men and women. Although trends in death rates by race/ ethnicity were similar for most cancer sites, death rates from pancreatic cancer, the fourth most common cause of cancer death in the United States, increased among white men and women but decreased among black men and women.

The three leading causes of cancer death for all men, with the exception of Asian/Pacific Islanders, were lung, prostate and colorectal cancer. Lung, liver and colorectal cancers were the top three causes of cancer death in Asian/Pacific Islander men. For women, the three leading causes of cancer death were lung, breast and colorectal cancer for all racial/ethnic groups except Hispanic women, for whom breast cancer ranked first. The differences and fluctuations in death rates by racial/ethnic group, sex, and cancer site may reflect differences in risk behaviors, socioeconomic status, and access to and use of screening and treatment.

“The continued decline in incidence and death rates for all cancers combined is extremely encouraging, but progress has been more limited for certain types of cancer, including many cancers that are currently less amenable to screening, such as cancer of esophagus, liver and pancreas,” said Betsy Kohler, executive director of NAACCR.

The special section on colorectal cancer rates says that long-term incidence trends for colorectal cancer have been fairly consistent for men and women, with major declines from 1985 to1995, minor increases from 1995 to1998, and significant declines from 1998 to 2006. Since 1984, death rates have also declined for men and women with accelerated rates of decline since 2002 for men and 2001 for women. In the most recent decade for which there are data (1997-2006), rates of newly diagnosed colorectal cancer have decreased for men and women in all racial/ethnic groups examined except American Indian/Alaskan Native (AI/AN) women. Incidence rates declined most rapidly among men and women over 65 years of age and increased most rapidly in people under age 50 in most population groups.

Graph of colorectal cancer incidence and mortality trends from 1975-2006 with red line for male incidence showing highest number of cases and orange line for female deaths showing lowest number of cases.

“This report shows that we have begun to make progress reducing colorectal cancer. Yet, colorectal cancer still kills more people than any other cancer except lung cancer,” said CDC Director Thomas Frieden, M.D. “Reducing smoking further can bring lung and other cancer rates down, and improved colorectal cancer screening can prevent colorectal cancer. Through CDC’s Colorectal Cancer Control Program, we have tremendous potential to reduce the disparities that exist in colorectal cancer screening and to save lives.” The CDC program supports population-based screening efforts and provides colorectal cancer screening services to low-income men and women ages 50 to 64 years who are underinsured or uninsured for screening, when no other insurance is available.

Researchers used microsimulation modeling to analyze the historical impact of changes in risk factors, screening and treatment practices, and to project future mortality trends for colorectal cancer. The model, named MISCAN-Colon, which was developed by NCI’s Cancer Intervention and Surveillance Modeling Network (CISNET) consortium, simulates the U.S. population from 1975 through 2020. The model includes factors that could increase risk for colorectal cancer (i.e., smoking, obesity, and red meat consumption), as well as factors that could decrease colorectal cancer risk (i.e., aspirin use, consumption of supplements such as folate and calcium, and physical activity). To calculate screening use, researchers used national data on the use of fecal occult blood testing (which looks for blood in stool samples), and endoscopy (including flexible sigmoidoscopy and colonoscopy, which allows doctors to examine the lower part of the colon or the entire large intestine, respectively). To assess the effects of treatment, researchers assessed data on use of, and disease-free survival rates associated with, four chemotherapy regimens used for advanced colorectal cancer during different historical time periods.

Using the model, the researchers were able to estimate the impact of historical changes in risk factors, screening practices, and treatment advances on past changes in incidence and mortality, as well as predict future trends through 2020.

 Projections of Colorectal Cancer Mortality with Differing Intensities of Cancer Control (2000 - 2020)

From 1975 to 2000, colorectal cancer incidence fell 22 percent, half of which was most likely due to changes in risk factors, and half due to screening. Similarly, colorectal cancer deaths fell by 26 percent during that time period, with a 9 percent drop resulting from a change in risk factors, a 14 percent drop from screening, and a 3 percent drop from improved treatment.

The researchers created projections to look at how colorectal cancer mortality trends could change with varying levels of cancer control interventions. If there were no changes in risk factors, screening or treatment (stable since 2000), Americans could expect a 17 percent decline in colorectal cancer mortality from 2000 to 2020. However, if current trends persist, Americans could see a 36 percent decline in colorectal cancer mortality. With accelerated cancer control efforts, there could be an overall colorectal cancer mortality reduction of 50 percent by 2020.

“The extraordinary progress on colorectal cancer shows what can be achieved by coordinated and targeted efforts to apply existing knowledge to cancer control at the state and federal level,” said John R. Seffrin, Ph.D., chief executive officer of the American Cancer Society. “Increases in colorectal cancer screening have been achieved through a variety of efforts, including education of the public and medical community and advocacy for health insurance coverage of the full range of colorectal cancer screening tests. The American Cancer Society is committed to continuing these efforts to get as close as we can to the potential 50 percent colorectal cancer mortality reduction that this report says is possible.”

###

Reference: Edwards BK, Ward E, Kohler BA, Eheman C, Zauber AG, Anderson R, Jemal A, Schymura MJ, Lansdorp-Vogelaar I, Seeff LC, van Ballegooijen M, Goede SL, Ries LAG. Annual Report to the Nation on the Status of Cancer, 1975-2006, Featuring Colorectal Cancer Trends and Impact of Interventions (Risk Factors, Screening, and Treatment) to Reduce Future Rates. Cancer; Published online Dec. 7, 2009; DOI: 10.1002/cncr.24760.

What is Cancer?

Thursday, March 24th, 2011

Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems.

Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start – for example, cancer that begins in the colon is called colon cancer; cancer that begins in basal cells of the skin is called basal cell carcinoma.

Cancer types can be grouped into broader categories. The main categories of cancer include:

Carcinoma - cancer that begins in the skin or in tissues that line or cover internal organs.
Sarcoma – cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.
Leukemia – cancer that starts in blood-forming tissue such as the bone marrow and causes large numbers of abnormal blood cells to be produced and enter the blood.
Lymphoma and myeloma - cancers that begin in the cells of the immune system.
Central nervous system cancers – cancers that begin in the tissues of the brain and spinal cord.

Origins of Cancer

All cancers begin in cells, the body’s basic unit of life. To understand cancer, it’s helpful to know what happens when normal cells become cancer cells.

The body is made up of many types of cells. These cells grow and divide in a controlled way to produce more cells as they are needed to keep the body healthy. When cells become old or damaged, they die and are replaced with new cells.

However, sometimes this orderly process goes wrong. The genetic material (DNA) of a cell can become damaged or changed, producing mutations that affect normal cell growth and division. When this happens, cells do not die when they should and new cells form when the body does not need them. The extra cells may form a mass of tissue called a tumor.

Not all tumors are cancerous; tumors can be benign or malignant.

Benign tumors aren’t cancerous. They can often be removed, and, in most cases, they do not come back. Cells in benign tumors do not spread to other parts of the body.
Malignant tumors are cancerous. Cells in these tumors can invade nearby tissues and spread to other parts of the body. The spread of cancer from one part of the body to another is called metastasis.
Some cancers do not form tumors. For example, leukemia is a cancer of the bone marrow and blood.

Welcome to Glem.com

Thursday, March 24th, 2011

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