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November 22, 2009
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Gallbladder Cancer

Weight Gain & Cancer Risk

Medical Author: Melissa Conrad Stöppler, MD
Medical Editor: William C. Shiel Jr., MD, FACP, FACR

Could weight gain increase your risk for gallbladder cancer?Excess weight is a known risk factor for many chronic diseases, such as diabetes and heart disease. Obesity has also been linked an increased risk for developing some cancers. To clarify the effects of weight gain on cancer risk, researchers in 2007 conducted an analysis of many studies reported in medical journals that describe 282,137 cases of cancer. The researchers wanted to see if weight gain had an effect on the risk for certain cancer types.

In particular, the researchers looked at the risk of cancer associated with a weight gain corresponding to an increase of 5 kg/m2 in body mass index (BMI). In terms of actual pounds gained, a man with a normal-range BMI of 23 would need to gain 15 kg (33 lbs.) of weight, while a woman with a BMI of 23 would need to gain 13 kg (28.6 lbs.) to correspond to an increase of 5 in the BMI.

The results, published in the Lancet in February 2008, revealed that weight gain is positively associated with the risk of developing a variety of types of cancer as described below.

For women, a weight gain corresponding to an increase of 5 in the BMI resulted in a significant increase in risk for developing four cancer types:

Gallbladder cancer is a disease in which malignant (cancer) cells form in the tissues of the gallbladder.

Gallbladder cancer is a rare disease in which malignant (cancer) cells are found in the tissues of the gallbladder. The gallbladder is a pear-shaped organ that lies just under the liver in the upper abdomen. The gallbladder stores bile, a fluid made by the liver to digest fat. When food is being broken down in the stomach and intestines, bile is released from the gallbladder through a tube called the common bile duct, which connects the gallbladder and liver to the first part of the small intestine.

The wall of the gallbladder has 3 main layers of tissue.

  • Mucosal (innermost) layer.


  • Muscularis (middle, muscle) layer.


  • Serosal (outer) layer.

Between these layers is supporting connective tissue. Primary gallbladder cancer starts in the innermost layer and spreads through the outer layers as it grows.

Being female can increase the risk of developing gallbladder cancer.

Anything that increases your chance of getting a disease is called a risk factor. Risk factors for gallbladder cancer include the following:

  • Being female.


  • Being Native American.

Possible signs of gallbladder cancer include jaundice, pain, and fever.

These and other symptoms may be caused by gallbladder cancer. Other conditions may cause the same symptoms. A doctor should be consulted if any of the following problems occur:



Next: What exams and tests are used to diagnose gallbladder cancer? »

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Gallbladder Cancer

Defining cancer

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.
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