Categories
Ailmemts & Remedies

Colorectal cancer(Bowel cancer)

Alternative Names:Bowel cancer,large bowel cancer,colon cancer or “CRC” includes cancerous growths in the colon, rectum and appendix.

What is Cancer?
Cancer is a group of more than 100 different diseases. They affect the body’s basic unit, the cell. Cancer occurs when cells become abnormal and divide without control or order. Like all other organs of the body, the colon and rectum are made up of many types of cells. Normally, cells divide to produce more cells only when the body needs them. This orderly process helps keep us healthy….

If cells keep dividing when new cells are not needed, a mass of tissue forms. This mass of extra tissue, called a growth or tumor, can be benign or malignant.

Benign tumors are not cancer. They can usually be removed and, in most cases, they do not come back. Most important, cells from benign tumors do not spread to other parts of the body. Benign tumors are rarely a threat to life.

Malignant tumors are cancer. Cancer cells can invade and damage tissues and organs near the tumor. Also, cancer cells can break away from a malignant tumor and enter the bloodstream or lymphatic system. This is how cancer spreads from the original (primary) tumor to form new tumors in other parts of the body. The spread of cancer is called metastasis.

When cancer spreads to another part of the body, the new tumor has the same kind of abnormal cells and the same name as the primary tumor. For example, if colon cancer spreads to the liver, the cancer cells in the liver are colon cancer cells. The disease is metastatic colon cancer (it is not liver cancer

Definition :

It is an   Invasive cancers that are confined within the wall of the colon (TNM stages I and II) are curable with surgery. If untreated, they spread to regional lymph nodes (stage III), where up to 73% are curable by surgery and chemotherapy. Cancer that metastasizes to distant sites (stage IV) is usually not curable, although chemotherapy can extend survival, and in rare cases, surgery and chemotherapy together have seen patients through to a cure.[3] Radiation is used with rectal cancer.

..click to see the pictures

On the cellular and molecular level, colorectal cancer starts with a mutation to the Wnt signaling pathway. When Wnt binds to a receptor on the cell, that sets in motion a chain of molecular events that ends with ß-catenin moving into the nucleus and activating a gene on DNA. In colorectal cancer, genes along this chain are damaged. Usually, a gene called APC, which is a “brake” on the Wnt pathway, is damaged. Without a working APC brake, the Wnt pathway is stuck in the “on” position
Invasive cancers that are confined within the wall of the colon (TNM stages I and II) are curable with surgery. If untreated, they spread to regional lymph nodes (stage III), where up to 73% are curable by surgery and chemotherapy. Cancer that metastasizes to distant sites (stage IV) is usually not curable, although chemotherapy can extend survival, and in rare cases, surgery and chemotherapy together have seen patients through to a cure. Radiation is used with rectal cancer.

On the cellular and molecular level, colorectal cancer starts with a mutation to the Wnt signaling pathway. When Wnt binds to a receptor on the cell, that sets in motion a chain of molecular events that ends with ß-catenin moving into the nucleus and activating a gene on DNA. In colorectal cancer, genes along this chain are damaged. Usually, a gene called APC, which is a “brake” on the Wnt pathway, is damaged. Without a working APC brake, the Wnt pathway is stuck in the “on” position.

Most cases of colon cancer begin as small, noncancerous (benign) clumps of cells called adenomatous polyps. Over time some of these polyps become colon cancers.

Symptoms:
*A change in your bowel habits, including diarrhea or constipation or a change in the consistency of your stool for more than a couple of weeks
*Rectal bleeding or blood in your stool
*Persistent abdominal discomfort, such as cramps, gas or pain
*A feeling that your bowel doesn’t empty completely
*Weakness or fatigue
*Unexplained weight loss

Many people with colon cancer experience no symptoms in the early stages of the disease. When symptoms appear, they’ll likely vary, depending on the cancer’s size and location in your large intestine.

Causes:
It’s not very clear what causes colon cancer in most cases. Doctors know that colon cancer occurs when healthy cells in the colon become altered. Healthy cells grow and divide in an orderly way to keep your body functioning normally. But sometimes this growth gets out of control — cells continue dividing even when new cells aren’t needed. In the colon and rectum, this exaggerated growth may cause precancerous cells to form in the lining of your intestine. Over a long period of time — spanning up to several years — some of these areas of abnormal cells may become cancerous.

But doctors are certain that colorectal cancer is not contagious (a person cannot catch the disease from a cancer patient). Some people are more likely to develop colorectal cancer than others. Factors that increase a person’s risk of colorectal cancer include high fat intake, a family history of colorectal cancer and polyps, the presence of polyps in the large intestine, and chronic ulcerative colitis.

Polyps may be small and produce few, if any, symptoms. For this reason, doctors recommend regular screening tests to help prevent colorectal cancer by identifying polyps before they become colorectal cancer.

Risk Factors:
The lifetime risk of developing colon cancer in the United States is about 7%. Certain factors increase a person’s risk of developing the disease. These include:

*Age: The risk of developing colorectal cancer increases with age. Most cases occur in the 60s and 70s, while cases before age 50 are uncommon unless a family history of early colon cancer is present.

*Polyps of the colon, particularly adenomatous polyps, are a risk factor for colon cancer. The removal of colon polyps at the time of colonoscopy reduces the subsequent risk of colon cancer.

*History of cancer. Individuals who have previously been diagnosed and treated for colon cancer are at risk for developing colon cancer in the future. Women who have had cancer of the ovary, uterus, or breast are at higher risk of developing colorectal cancer.

Heredity:
*Family history of colon cancer, especially in a close relative before the age of 55 or multiple relatives.
*Familial adenomatous polyposis (FAP) carries a near 100% risk of developing colorectal cancer by the age of 40 if untreated
*Hereditary nonpolyposis colorectal cancer (HNPCC) or Lynch syndrome
*Gardner syndrome

*Smoking: Smokers are more likely to die of colorectal cancer than nonsmokers. An American Cancer Society study found “Women who smoked were more than 40% more likely to die from colorectal cancer than women who never had smoked. Male smokers had more than a 30% increase in risk of dying from the disease compared to men who never had smoked.”

*Diet: Studies show that a diet high in red meat and low in fresh fruit, vegetables, poultry and fish increases the risk of colorectal cancer. In June 2005, a study by the European Prospective Investigation into Cancer and Nutrition suggested that diets high in red and processed meat, as well as those low in fiber, are associated with an increased risk of colorectal cancer. Individuals who frequently eat fish showed a decreased risk. However, other studies have cast doubt on the claim that diets high in fiber decrease the risk of colorectal cancer; rather, low-fiber diet was associated with other risk factors, leading to confounding. The nature of the relationship between dietary fiber and risk of colorectal cancer remains controversial.

*Lithocholic acid: Lithocholic acid is a bile acid that acts as a detergent to solubilize fats for absorption. It is made from chenodeoxycholic acid by bacterial action in the colon. It has been implicated in human and experimental animal carcinogenesis. Carbonic acid type surfactants easily combine with calcium ion and become detoxication products.

*Physical inactivity: People who are physically active are at lower risk of developing colorectal cancer.
Viruses: Exposure to some viruses (such as particular strains of human papilloma virus) may be associated with colorectal cancer.[citation needed]
Primary sclerosing cholangitis offers a risk independent to ulcerative colitis.
Low levels of selenium.

*Inflammatory bowel disease: About one percent of colorectal cancer patients have a history of chronic ulcerative colitis. The risk of developing colorectal cancer varies inversely with the age of onset of the colitis and directly with the extent of colonic involvement and the duration of active disease. Patients with colorectal Crohn’s disease have a more than average risk of colorectal cancer, but less than that of patients with ulcerative colitis.

*Environmental factors. Industrialized countries are at a relatively increased risk compared to less developed countries that traditionally had high-fiber/low-fat diets. Studies of migrant populations have revealed a role for environmental factors, particularly dietary, in the etiology of colorectal cancers.

*Exogenous hormones. The differences in the time trends in colorectal cancer in males and females could be explained by cohort effects in exposure to some gender-specific risk factor; one possibility that has been suggested is exposure to estrogens. There is, however, little evidence of an influence of endogenous hormones on the risk of colorectal cancer. In contrast, there is evidence that exogenous estrogens such as hormone replacement therapy (HRT), tamoxifen, or oral contraceptives might be associated with colorectal tumors.

*Alcohol: Drinking, especially heavily, may be a risk factor.

*Vitamin B6 intake is inversely associated with the risk of colorectal cancer.

Diagnosis:
If your signs and symptoms indicate that you could have colon cancer, your doctor may recommend one of more tests and procedures, including:

*Blood tests. Your doctor may order blood tests to better understand what may be causing your signs and symptoms, but there are no blood tests that can detect colon cancer. Blood tests may include a complete blood count and organ-function tests.

*Using a scope to examine the inside of your colon. Colonoscopy uses a long, flexible and slender tube attached to a video camera and monitor to view your entire colon and rectum. If any suspicious areas are found, your doctor can pass surgical tools through the tube to take tissue samples (biopsies) for analysis.

*Using dye and X-rays to make a picture of your colon. A barium enema allows your doctor to evaluate your entire colon with an X-ray. Barium, a contrast dye, is placed into your bowel in an enema form. During a double-contrast barium enema, air also is added. The barium fills and coats the lining of the bowel, creating a clear silhouette of your rectum, colon and sometimes a small portion of your small intestine.

*Using multiple CT images to create a picture of your colon. Virtual colonoscopy combines multiple computerized tomography (CT) images to create a detailed picture of the inside of your colon. If you’re unable to undergo colonoscopy, your doctor may recommend virtual colonoscopy.

Staging colon cancer.
Once you’ve been diagnosed with colon cancer, your doctor will then order tests to determine the extent, or stage, of your cancer. Staging helps determine what treatments are most appropriate for you. Staging tests may include imaging procedures such as abdominal and chest CT scans. In many cases, the stage of your cancer may not be determined until after colon cancer surgery.

The stages of colon cancer are:

*Stage 0. Your cancer is in the earliest stage. It hasn’t grown beyond the inner layer (mucosa) of your colon or rectum. This stage of cancer may also be called carcinoma in situ.
*Stage I. Your cancer has grown through the mucosa but hasn’t spread beyond the colon wall or rectum.
*Stage II. Your cancer has grown into or through the wall of the colon or rectum but hasn’t spread to nearby lymph nodes.
*Stage III. Your cancer has invaded nearby lymph nodes but isn’t affecting other parts of your body yet.
*Stage IV. Your cancer has spread to distant sites, such as other organs — for instance to your liver or lung.
*Recurrent. This means your cancer has come back after treatment. It may recur in your colon, rectum or other part of your body.
Treatment:
The main treatment option for Colorectal cancer  is surgery – if the disease can be caught before it breaks through the bowel wall, chances of success are much higher.

Usually, the piece of bowel that contains the cancer is removed and the two open ends are joined back together. This operation is called a bowel resection.

If the two sections can’t be joined back together, often because the tumour is too low, the bowel can be brought out through the abdominal wall. This is called a stoma, which is connected to a colostomy bag. Although this procedure is more likely after removal of a tumour in the rectum, it isn’t always necessary and may only be temporary. In these cases, further treatment may not be necessary.

Chemotherapy and radiotherapy are increasingly being used to treat bowel cancer in addition to surgery, especially in more advanced tumours. For example, a combination of radiotherapy and chemotherapy may be given before surgery for rectal cancer. This is known as neo-adjuvant therapy and may reduce the risk of recurrence and improve survival rates.

How well patients do after treatment depends on the stage the cancer has reached. Survival rates have improved in the past 30 years, but overall survival is still only about 50 per cent at five years. However, when bowel cancer is caught early – before it has spread to other organs such as the liver or the lungs – the chances of recovery are more than 80 per cent.

Alternative Medication:
No complementary or alternative treatments have been found to cure colon cancer.

Alternative treatments may help you cope with a diagnosis of colon cancer. Nearly all people with cancer experience some distress. Common signs and symptoms of distress after your diagnosis might include sadness, anger, difficulty concentrating, difficulty sleeping and loss of appetite. Alternative treatments may help redirect your thoughts away from your fears, at least temporarily, to give you some relief.

Alternative treatments that may help relieve distress include:

*Art therapy
*Dance or movement therapy
*Exercise
*Meditation
*Music therapy
*Relaxation exercises

Your doctor can refer you to professionals who can help you learn about and try these alternative treatments. Tell your doctor if you’re experiencing distress.

Prognosis:
Survival is directly related to detection and the type of cancer involved, but overall is poor for symptomatic cancers, as they are typically quite advanced. Survival rates for early stage detection is about 5 times that of late stage cancers. For example, patients with a tumor that has not breached the muscularis mucosa (TNM stage T1-2, N0, M0) have an average 5-year survival of approximately 90%. Those with a more invasive tumor, yet without node involvement (T3-4, N0, M0) have an average 5-year survival of approximately 70%. Patients with positive regional lymph nodes (any T, N1-3, M0) have an average 5-year survival of approximately 40%, while those with distant metastases (any T, any N, M1) have an average 5-year survival of approximately 5%.

CEA level is also directly related to the prognosis of disease, since its level correlates with the bulk of tumor tissue.

Follow Up:
The aims of follow-up are to diagnose, in the earliest possible stage, any metastasis or tumors that develop later, but did not originate from the original cancer (metachronous lesions).

The U.S. National Comprehensive Cancer Network and American Society of Clinical Oncology provide guidelines for the follow-up of colon cancer.[93][94] A medical history and physical examination are recommended every 3 to 6 months for 2 years, then every 6 months for 5 years. Carcinoembryonic antigen blood level measurements follow the same timing, but are only advised for patients with T2 or greater lesions who are candidates for intervention. A CT-scan of the chest, abdomen and pelvis can be considered annually for the first 3 years for patients who are at high risk of recurrence (for example, patients who had poorly differentiated tumors or venous or lymphatic invasion) and are candidates for curative surgery (with the aim to cure). A colonoscopy can be done after 1 year, except if it could not be done during the initial staging because of an obstructing mass, in which case it should be performed after 3 to 6 months. If a villous polyp, a polyp >1 centimeter or high grade dysplasia is found, it can be repeated after 3 years, then every 5 years. For other abnormalities, the colonoscopy can be repeated after 1 year.

Routine PET or ultrasound scanning, chest X-rays, complete blood count or liver function tests are not recommended. These guidelines are based on recent meta-analyses showing intensive surveillance and close follow-up can reduce the 5-year mortality rate from 37% to 30%.

Prevention:
People are encouraged to eat plenty of fresh fruit and vegetables, as this appears to reduce the risk. A high-fibre diet with plenty of fruit, vegetables and carbohydrates (pasta, bread, rice) is believed to reduce the risk of colorectal cancer. Moderate amounts of exercise may also protect against bowel cancer.

Eating a diet high in saturated fat and red meat, and low in fibre, smoking and being overweight, increases your risk as does drinking excessive amounts of alcohol.

Eating at least five portions of fruit and vegetables every day is thought to protect against this and many different cancers through the benefits of the antioxidant vitamins and minerals they contain.

Disclaimer: This information is not meant to be a substitute for professional medical advise or help. It is always best to consult with a Physician about serious health concerns. This information is in no way intended to diagnose or prescribe remedies.This is purely for educational purpose.

Resources:
http://www.medicinenet.com/colon_cancer/article.htm
http://en.wikipedia.org/wiki/Colorectal_cancer
http://search.myway.com/search/GGmain.jhtml?pg=AJmain&action=click&searchfor=colorectal+cancer&ss=sub&st=site&ct=TG
http://www.bbc.co.uk/health/physical_health/conditions/in_depth/cancer/typescancer_bowel.shtml
http://www.mayoclinic.com/health/colon-cancer/DS00035

http://www.bbc.co.uk/health/physical_health/conditions/in_depth/cancer/typescancer_bowel.shtml

http://www.khg2.net/colon-cancer/

http://www.metrohealth.org/body.cfm?id=1628&oTopID=1616

Categories
Healthy Tips News on Health & Science

Drinking Milk is Good for Health.

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Drinking milk ‘cuts risk of dying from heart disease and stroke by one fifth’..say Scientists
Contrary to reports that milk harms health, they claim consumption could reduce the risk of succumbing to chronic illness by as much as a fifth.
Scientists at Reading and Cardiff universities reviewed 324 studies on the effects of milk consumption.

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Healthy stuff: Drinking just a third of a pint of milk daily can benefit health.

They found milk protects against developing most diseases, apart from prostate cancer, and can cut deaths from illnesses by 15 to 20 per cent.
Reading University‘s Professor Ian Givens said milk had more to offer than just building strong bones and helping growth.
‘Our review made it possible to assess whether increased milk consumption provides a survival advantage or not,’ he said. ‘We believe it does.
‘When the numbers of deaths from coronary heart disease, stroke and colo-rectal cancer were taken into account, there is strong evidence of an overall reduction in the risk of dying.

‘We found no evidence milk might increase the risk of developing conditions, with the exception of prostate cancer. ‘


The White Stuff: Milk doesn’t just build healthy bones

The reviewers say that encouraging greater milk consumption might eventually reduce NHS treatment costs because of lower levels of chronic disease.
‘There is an urgent need to understand the mechanisms involved and for focused studies to confirm the epidemiological evidence since this topic has major implications for the agri-food industry‘ said Professor Givens.


Source:
http://www.dailymail.co.uk/health/article-1201474/Drinking-milk-cuts-risk-dying-heart-disease-stroke-fifth.html#ixzz0M699ngRY

 
Categories
Diagnonistic Test

Flexible Sigmoidoscopy

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Definition:
Flexible sigmoidoscopy is a procedure used to see inside the sigmoid(the lower portion of the large intestine) colon and rectum. Flexible sigmoidoscopy can detect inflamed tissue, abnormal growths, and ulcers. The procedure is used to look for early signs of cancer and can help doctors diagnose unexplained changes in bowel habits, abdominal pain, bleeding from the anus, and weight loss.

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. The endoscope used for this test is about a half-inch wide and long enough to reach about two feet into the colon. A sigmoidoscopy can detect early cancers as well as polyps that could later become cancerous.

Sigmoidoscopy is an effective screening test for colon cancer if you have the procedure done every five years starting at age 50. Alternatively, you might choose to have a colonoscopy every 10 years to screen for colon cancer. In either case, it’s wise to have a fecal occult blood test in the years you don’t have a sigmoidoscopy or colonoscopy. A sigmoidoscopy is also useful for evaluating the cause of abdominal pain, blood in the stool, constipation, and diarrhea.

What are the sigmoid colon and rectum?
The sigmoid colon is the last one-third of the colon. The colon comprises three main parts: the ascending colon, the transverse colon, and the sigmoid colon—sometimes called the descending colon. The colon absorbs nutrients and water and forms stool.

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The sigmoid colon is the last one-third of the colon.

The rectum is about 6 inches long and connects the sigmoid colon to the anus. Stool leaves the body through the anus. Muscles and nerves in the rectum and anus control bowel movements.

Difference between flexible sigmoidoscopy and colonoscopy:
Flexible sigmoidoscopy enables the doctor to see only the sigmoid colon, whereas colonoscopy allows the doctor to see the entire colon. Colonoscopy is the preferred screening method for cancers of the colon and rectum; however, to prepare for and perform a flexible sigmoidoscopy usually requires less time.

How to Prepare for a Flexible Sigmoidoscopy:
To prepare for a flexible sigmoidoscopy, one or more enemas are performed about 2 hours before the procedure to remove all solids from the sigmoid colon. An enema is performed by flushing water, laxative, or sometimes a mild soap solution into the anus using a special wash bottle.

In some cases, the entire gastrointestinal tract must be emptied by following a clear liquid diet for 1 to 3 days before the procedure—similar to the preparation for colonoscopy. Patients should not drink beverages containing red or purple dye. Acceptable liquids include

*fat-free bouillon or broth
*strained fruit juice
*water
*plain coffee
*plain tea
*sports drinks, such as Gatorade
*gelatin

A laxative or an enema may also be required the night before a flexible sigmoidoscopy. A laxative is medicine that loosens stool and increases bowel movements. Laxatives are usually swallowed in pill form or as a powder dissolved in water.

Patients should inform their doctor of all medical conditions and any medications, vitamins, or supplements taken regularly, including

*aspirin
*arthritis medications
*blood thinners
*diabetes medications
*vitamins that contain iron

What happens when the test is performed?
You wear a hospital gown for the procedure and lie on your side on a table. After applying some clear jelly to his or her gloved hand, the doctor feels the inside of your rectum with a finger, then gently inserts one end of the sigmoidoscope inside.

The doctor will fill your intestine with air, which often causes some pain similar to the cramping you might get when you have gas. As the camera on the scope transmits pictures to a video screen, your doctor watches for any suspicious lesions on your bowel lining. If one appears, he or she might use some small clippers on the end of the scope to take a tissue sample to check under the microscope. When the test is finished, the doctor vacuums the air out of your intestine and slowly removes the tube. The test usually takes 10-30 minutes.

How is a flexible sigmoidoscopy performed?

Examination of the Sigmoid Colon:
During a flexible sigmoidoscopy, patients lie on their left side on an examination table. The doctor inserts a long, flexible, lighted tube called a sigmoidoscope, or scope, into the anus and slowly guides it through the rectum and into the sigmoid colon. The scope inflates the colon with air to give the doctor a better view. A small camera mounted on the scope transmits a video image from inside the colon to a computer screen, allowing the doctor to carefully examine the tissues lining the sigmoid colon and rectum. The doctor may ask the patient to move periodically so the scope can be adjusted for better viewing.

When the scope reaches the transverse colon, the scope is slowly withdrawn while the lining of the colon is carefully examined again.

Risk Factors:
The risks are minimal. The chance of perforation is less than for a colonoscopy. A few people have a small amount of bleeding after the procedure if a biopsy has been taken.

Must you do anything special after the test is over?
You should feel fine and be able to return to your regular activities immediately after the test. Call your doctor if you have more than light bleeding from the rectum or if you have continuing abdominal pain

Biopsy and Removal of Colon Polyps
The doctor can remove growths, called polyps, during flexible sigmoidoscopy using special tools passed through the scope. Polyps are common in adults and are usually harmless. However, most colon cancer begins as a polyp, so removing polyps early is an effective way to prevent cancer. If bleeding occurs, the doctor can usually stop it with an electrical probe or special medications passed through the scope.

During a flexible sigmoidoscopy, the doctor can also take samples from abnormal-looking tissues. Called a biopsy, this procedure allows the doctor to later look at the tissue with a microscope for signs of disease.

Tissue removal and the treatments to stop bleeding are usually painless. If polyps or other abnormal tissues are found, the doctor may suggest examining the rest of the colon with a colonoscopy.

Recovery
A flexible sigmoidoscopy takes about 20 minutes. Cramping or bloating may occur during the first hour after the procedure. Bleeding and puncture of the large intestine are possible but uncommon complications. Discharge instructions should be carefully read and followed.

Patients who develop any of these rare side effects should contact their doctor immediately:-
*severe abdominal pain
*fever
*bloody bowel movements
*dizziness
*weakness

Points to Remember
*Flexible sigmoidoscopy is a procedure used to see inside the sigmoid colon and rectum.
*One or more enemas are performed about 2 hours before the procedure to remove all solids from the sigmoid colon.
*In some cases, the entire gastrointestinal tract must be emptied—similar to the preparation for colonoscopy.
*A sigmoidoscope transmits a video image from inside the colon to a computer screen.
*A doctor can biopsy abnormal-looking tissues during a flexible sigmoidoscopy.
*Polyps can be removed using special tools passed through the sigmoidoscope.
*If polyps or other abnormal tissues are found, the doctor may suggest examining the rest of the colon with a colonoscopy.
*A flexible sigmoidoscopy takes about 20 minutes.

Hope through Research
The National Institute of Diabetes and Digestive and Kidney Diseases conducts and supports basic and clinical research into many digestive disorders.

Participants in clinical trials can play a more active role in their own health care, gain access to new research treatments before they are widely available, and help others by contributing to medical research. For information about current studies, visit www.ClinicalTrials.gov.

For More Information
Fact sheets about other diagnostic tests are available from the National Digestive Diseases Information Clearinghouse at www.digestive.niddk.nih.gov, including

Resources:
http://digestive.niddk.nih.gov/ddiseases/pubs/sigmoidoscopy/
https://www.health.harvard.edu/fhg/diagnostics/flexible-sigmoidoscopy.shtml

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Categories
News on Health & Science

Obesity Is Found to Make Ovarian Cancer Deadlier

 

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Ovarian cancer is fairly common. ”About one in 60 American women will develop ovarian cancer,” said Dr. Andrew J. Li, the senior author of the study, a faculty physician at the Cedars-Sinai Medical Center and an assistant professor of obstetrics and gynecology at the University of California, Los Angeles. Each year, about 20,000 new cases are diagnosed and about 15,000 women die of the disease, according to the American Cancer Society.

It is well known that obesity is associated with various malignancies, including kidney, throat, breast and colon cancers. Findings about obesity and ovarian cancer have been somewhat less clear, the researchers say, but evidence from previous studies suggests that obesity predicts a worse outcome for ovarian cancer patients as well.

The scientists wanted to know whether excess fat, apart from any other health problems it might cause, had direct effects on tumor growth. They reviewed the medical records of 216 patients at Cedars-Sinai who had surgery for epithelial ovarian cancer. The data included information on height, weight, age and any other diseases. The cause of death was presumed to be cancer related if the patient had advanced recurrent disease at the time of death.

Half the patients had ideal weight, with a body mass index from 18.5 to 24.9, and 8 percent had a B.M.I. of less than 18.5, considered underweight. Twenty-six percent were overweight, with indexes exceeding 25, and 16 percent were obese, with indexes higher than 30.

The overweight and obese differed little from normal and underweight people in age or in health status, except that they had more hypertension and diabetes.

But among patients with Stage III or Stage IV disease, the most advanced stages, those with B.M.I.’s greater than 25 survived disease free for an average of 17 months, compared with 25 months for people with indexes lower than 25.

For each increase of one unit in the index, the researchers found a 4 percent increase in the risk of recurrence and a 5 percent increase in the risk of death.

This ”dose response” effect strongly suggests that obesity alone is responsible for the decreased survival time, Dr. Li said.

The researchers acknowledge that their study, published yesterday in the journal Cancer, has certain weaknesses.

They found that a slightly lower dose of chemotherapy relative to body surface was given to obese patients, and it is possible that this underdosing may have had a role.

In addition, fluid in the body cavity, a symptom of the disease, may have artificially increased the B.M.I. of some patients. And it is possible that other diseases like hypertension and diabetes, more prevalent among the obese, could have decreased survival among those patients.

The study was also limited by its retrospective method and small sample population.

The researchers said they believed that it was unlikely that those factors could have accounted for the decreased overall survival time of obese women. More likely, they said, is that the presence of fat tissue encourages tumor growth or increases resistance to treatment.

”There may be some factor secreted by adipose tissue that makes tumors less sensitive to chemotherapy,” Dr. Li said, referring to fat tissue. ”We have some ideas, and we’re working on looking at those factors now.”

Dr. Li said obesity did not increase the risk of developing ovarian cancer, but did affect the chance of survival when a person developed it.

”Reducing obesity and maintaining an ideal body weight,” he said, ”is important for many reasons. This is just one more health problem in which obesity plays a role.”

Source:The New York Times

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