Study supports link between obesity and higher incidence of cancer, poorer prognosis

Researchers may have discovered a new explanation as to why obese patients with cancer often have a poorer prognosis compared with those who are lean. The potential explanation is based on data reported in Cancer Research, a journal of the American Association for Cancer Research.

"Studies of the population have clearly established that there is a link between obesity and ," said Mikhail Kolonin, Ph.D., associate professor at the Institute of Molecular Medicine at The University of Texas Health Science Center at Houston. "Moreover, for several cancers, obesity is associated with a poorer prognosis."

Kolonin and his colleagues evaluated how obesity promotes . "Our earlier studies led us to hypothesize that fat tissue called , which is the fat tissue that expands in individuals who are obese, is itself directly involved and that it is not just diet and lifestyle that are important," he said.

Their initial results confirmed this hypothesis: In obese and lean mice that ate the same diet, tumors grew much faster in than they did in lean mice. The researchers also observed that there were far more white adipose tissue cells (called adipose stromal cells) in obese mice than in lean mice and thus turned their focus on the role of these cells.

Detailed analyses indicated cancer induced mobilization of adipose stromal cells into the circulation. Once in the tumors, some of these cells developed into , while others were incorporated into tumor-associated blood vessels.

Tumor-associated blood vessels support tumor growth by bringing in oxygen and nutrients vital for cancer cell survival and proliferation. Kolonin noted that the ability of adipose to contribute to the formation of tumor-associated blood vessels is likely one of the main reasons that the excess of these cells in tumors was associated with increased malignant and tumor growth.

"Our data provide the first in vivo evidence of recruitment of cells from endogenous fat tissue to tumors," said Kolonin. "The fact that these cells are present in tumors is still an emerging concept. We have shown that not only are they present, but they are also functional and affect tumor growth. Identifying the signals that cause these cells to be recruited to tumors and finding ways to block them might provide a new avenue of cancer treatment."

add to favorites email to friend print save as pdf

Related Stories

Some stem cells can trigger tumors

Jun 05, 2012

(Medical Xpress) -- Stem cells often used in reconstructive surgery following mastectomies and other cancer-removal treatments may pose a danger: Cornell biomedical scientists have discovered that these cells, ...

Cancer exploits the body's wound-healing process

May 05, 2005

Scientists have known for the last decade that a link exists between wound healing and cancer. For instance, in a 1994 experiment at the Lawrence Berkeley National Laboratory, chickens infected with a cancer virus developed ...

Recommended for you

Putting the brakes on cancer

22 hours ago

A study led by the University of Dundee, in collaboration with researchers at our University, has uncovered an important role played by a tumour suppressor gene, helping scientists to better understand how ...

Peanut component linked to cancer spread

23 hours ago

Scientists at the University of Liverpool have found that a component of peanuts could encourage the spread and survival of cancer cells in the body.

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.