Study: Sugar promotes tumor growth and metastasis in mouse model breast cancer


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Previous human studies found associations between high sugar intake and breast cancer risk. This study looked at the direct effect of sugar on breast cancer growth and metastasis in mice. While researchers observed that sugar increased tumor growth and metastasis, more work needs to be done to see if this finding is relevant in humans. It is important to remember, the overall health benefits of limiting sugar intake remain undisputed. (02/02/16)

Contents

At a glance                  Questions for your doctor
Findings               Limitations              
Guidelines Resources and reference


STUDY AT A GLANCE

This study is about:

How sugar may drive breast tumor growth and metastasis in a mouse model of breast cancer.  

Why is this study important?

This is an early step in understanding how high sugar intake might affect breast cancer growth and development.

Study findings: 

  1. Sucrose (table sugar) intake increased tumor growth and metastasis in a mouse model of breast cancer.

What does this mean for me?

This study was done in well-established mouse models of breast cancer in which researchers knew that about half of the mice would develop breast cancer in the course of the experiment. While these types of early laboratory studies in mice are important for scientists trying to understand how cancer develops and spreads, they are not directly applicable to humans. It is important to remember that while the researchers tried to match the sugar levels the mice received to those found in Westernized diets, the rest of the mouse diet was not comparable to an average person’s diet.

The dangers of consuming excessive amounts of sugar are well established—the American Heart Association recommends that men and women consume no more than 37.5g and 25g of sugar, respectively. While this study does not conclusively show that sugar should be avoided or that excess sugar causes breast cancer to occur or spread, the overall health benefits of limiting sugar intake remain undisputed.

Expert Guidelines

Research links obesity, lack of physical exercise and alcohol to increased breast cancer risk. Studies have produced unclear or conflicting data on most other aspects of diet.

The American Cancer Society recommends the following to reduce breast cancer risk:

  • If you drink, have no more than 1 drink a day.
  • Maintain a healthy weight throughout your life. Balance what you eat with physical activity to avoid gaining excessive weight.
  • Stay physically active. Get at least 150 minutes of moderate intensity or 75 minutes of vigorous intensity activity each week.

The National Comprehensive Cancer Network recommends the following for breast cancer patients:

  • Be active and maintain a healthy weight.
  • Keep a balanced diet.
  • Maintain an appropriate level of calorie intake.
  • Drink enough fluids and limit alcohol intake.

The American Institute for Cancer Research (AICR) is an organization that translates research on diet and cancer risk into practical information for the public. AICR recommends that people try to meet their nutritional needs through a healthy diet. They do not discourage people from taking a multivitamin supplement, but they warn people not to rely on diet alone to protect from cancer. 

Questions To Ask Your Health Care Provider

  • I've have had breast cancer, what type of diet is best for me? 
  • I've had breast cancer, are there any foods I should avoid?
  • How can I lower my breast cancer risk?
  • How can I better control sugar in my diet?
  • Can you refer me to a nutritionist?

Open Clinical Trials

The following clinical trials on diet or nutrition are currently recruiting participants:

  • NCT02334085 The Health of Women Study (HOW). This study conducted by Dr. Susan Love is recruiting men and women 18 years and older with and without breast cancer to assess factors including diet that influence the risk of breast cancer. Participation is via online survey.

The following clinical trials on diet or nutrition are currently recruiting participants with breast cancer to look at impact on treatment and outcomes:

IN DEPTH REVIEW OF RESEARCH

Study background:

Previous studies in humans have found associations between high sugar intake and breast cancer risk, including a recent study that found that increased consumption of sugar-sweetened beverages is a contributor to worldwide obesity, heart disease, and cancer. However, no study has directly studied whether a high-sugar diet can cause breast cancer to grow and/or affect breast cancer metastasis

In January 2016, Yan Jiang and colleagues at the University of Texas MD Anderson Cancer Center published a paper in the journal Cancer Research looked at breast cancer development, growth, and metastasis in mice with various amounts of table sugar in their diets. This is the first study to look at a direct effect of consuming sugar and breast cancer development using mouse models of breast cancer.

Researchers of this study wanted to know:

Whether sugar consumption led to breast tumor growth and metastasis in mouse models of breast cancer.

Population(s) looked at in the study:

This study used two well-established mouse models of breast cancer. The first is a model in which 50% of the mice are known to develop tumors after six months under normal conditions. The second is a model in which breast cancer metastasizes to the mouse lung. 

Study findings: 

Compared to mice than did not consume sugar, mice that did consume sugar:

  1. developed more tumors.
  2. had a higher number of lung metastases.
  3. had significant quantities of a protein known as 12-LOX—which provides a clue to cellular changes that might have caused tumors to grow in response to sugar. 

Limitations:

While this is the first study to look directly at the effect of sugar on tumor growth, more work is needed to determine whether the same effect occurs in humans. It is important to note that close to half of the mice in the study would have developed tumors after six months regardless of the amount of sugar they ate. While they were fed an amount of sugar that is equivalent to a Westernized diet, other nutrients in their diet were not the same as in a Westernized human diet.   

Conclusions:

This study suggests that sugar may play a role in breast tumor growth and metastasis. It does not, however, implicate sugar or a particular amount of sugar as a cause of breast cancer. It is important to remember that this is early research in mice and more work needs to be done to understand this effect in humans. Although limiting sugar consumption is recommended for overall health, the data from this study does not provide enough evidence for people to stop consuming sugar entirely to reduce their risk of breast cancer development, growth, or metastasis

Aside from the results of this study, everybody should limit sugar consumption, as recommended by the American Heart Association; your own personal or family health history may dictate that you follow more specific health guidelines.  If you are concerned with how your diet affects your cancer or cancer risk, please discuss your options with your health care provider. 

Posted 2/2/16

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