Tag Archives: cancer research

Diabetes drug kept breast tumors away in mice

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Diabetes drug kept breast tumors away in mice

Adding the common diabetes drug metformin to chemotherapy helped shrink breast cancer tumors faster in mice and keep them away longer than chemotherapy alone, raising hope for a more effective way to treat cancer, U.S. researchers said on Monday.

They said metformin appeared to target breast cancer stem cells — a kind of master cancer cell that resists conventional treatment and may be the source of many tumors that grow back.

“What’s exciting here is we now have something that is mechanistically a different kind of killer of cancer that can synergize with chemotherapy,” Kevin Struhl of Harvard Medical School, whose study appears in the journal Cancer Research, said in a telephone briefing.

Many teams have been looking for ways to destroy the master cancer cells in the hope of making cancer easier to cure.

Last month, a team at the Broad Institute of Harvard and the Massachusetts Institute of Technology reported that a chemical called salinomycin could kill breast cancer stem cells.

What is different with his study, Struhl said, is that metformin is a widely used drug with a long safety track record. “There are tens of millions of people who take this drug,” he said.

“Although our studies are limited to mice and cells, metformin has a history of anti-cancer effects,” he said.

Metformin has already been shown to reduce the risk of some cancers, including pancreatic and breast cancer, in large studies of people with diabetes.

Struhl said metformin’s affect on cancer stem cells appeared to be separate from its ability to help the body use insulin and lower blood sugar — which also can improve breast cancer survival.

His team studied metformin and the cancer drug doxorubicin in lab dishes and found they killed both human cancer stem cells and non-stem cancer cells.

Mice that had tumors and got metformin and chemotherapy were less likely to have tumors grow back two months after treatment compared with mice that got chemotherapy alone.

“When we had both drugs together, we lost the tumors faster, but more importantly, there was no relapse,” Struhl said.

He said with metformin, it may be possible to reduce the chemotherapy dose and still get the same benefit.

That will need to be studied in people and a study is getting under way. Dr. Jennifer Ligibel, at Dana-Farber Cancer Institute and Harvard, is organizing a large trial with colleagues in Canada to study metformin in women with early stage breast cancer.

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Cancer

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A young woman exhales cigarette smoke in Shanghai, China. The People’s Republic of China is both the world’s largest producer and largest consumer of tobacco, which has led to an impending cancer epidemic in the most populous country on Earth.

Cancer is a disease that begins as a renegade human cell over which the body has lost control. In order for the body and its organs to function properly, cell growth needs to be strictly regulated. Cancer cells, however, continue to divide and multiply at their own speed, forming abnormal lumps, or tumors. An estimated 6.7 million people currently die from cancer every year.

Not all cancers are natural-born killers. Some tumors are referred to as benign because they don’t spread elsewhere in the body. But cells of malignant tumors do invade other tissues and will continue to spread if left untreated, often leading to secondary cancers.

Cancers can start in almost any body cell, due to damage or defects in genes involved in cell division. Mutations build up over time, which is why people tend to develop cancer later in life. What actually triggers these cell changes remains unclear, but diet, lifestyle, viral infections, exposure to radiation or harmful chemicals, and inherited genes are among factors thought to affect a person’s risk of cancer.

Lung cancer is the world’s most killing cancer. It claims about 1.2 million victims a year. Most of those victims are smokers, who inhale cancer-causing substances called carcinogens with every puff. Experts say around 90 percent of lung cancer cases are due to tobacco smoking.

Breast cancer now accounts for almost one in four cancers diagnosed in women. Studies suggest the genes you inherit can affect the chances of developing the illness. A woman with an affected mother or sister is about twice as likely to develop breast cancer as a woman with no family history of the disease. Lifestyle may also have an influence, particularly in Western countries where many women are having children later. Women who first give birth after the age of 30 are thought to have a three times greater risk of breast cancer than those who became mothers in their teens.

Geographical Distinctions

There are also stark geographic differences, with incidence rates varying by as much as thirtyfold between regions. In much of Asia and South and Central America, for example, cervix cancer is the most deadly in females. However, in North America and Europe another kind of gynecological cancer, ovarian cancer, is a more serious threat.

Among males, southern and eastern Africa record the second and third highest rates of oesophageal, or gullet, cancer after China, but western and central regions of Africa have the lowest incidence in the world. Differences in diet may explain this.

Nevertheless, the reasons why many cancers develop remain elusive. Brain cancer, leukemia (blood cancer), and lymphoma (cancer of the lymph glands) are among types that still mystify scientists.

Treatments

Yet ever more people are surviving diagnosis thanks to earlier detection, better screening, and improved treatments. The three main treatment options are surgery, radiotherapy and chemotherapy. Radiotherapy, also called radiation therapy, involves blasting tumors with high-energy x-rays to shrink them and destroy cancerous cells. Chemotherapy employs cancer-killing drugs.

Even so, future cancer cases are predicted to climb, since the world’s population is aging. The proportion of people over age 60 is expected to more than double by 2050, rising from 10 percent to 22 percent. This will add an estimated 4.7 million to the cancer death toll by 2030.

Pomegranate compounds may ease breast cancer risk

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Pomegranate compounds may ease breast cancer risk

Enzyme-blocking chemicals in pomegranates may reduce the risk of estrogen-fueled breast cancers, U.S. researchers said on Tuesday.

An acid found in pomegranates appears to block aromatase, an enzyme that converts androgen to estrogen, a hormone that plays a role in the development of breast cancer, the researchers wrote in the journal Cancer Prevention Research.

“We identified some of these chemicals in pomegranates that actually have properties that can suppress aromatase,” researcher Shiuan Chen, of the City of Hope cancer research and treatment center in Duarte, California, said in a telephone interview.

Many women who have had breast cancer take medicines called aromatase inhibitors — such as Pfizer’s Aromasin, Novartis’ Femara and AstraZeneca Plc’s Arimidex — to keep estrogen from feeding tumors.

Chen and colleagues studied whether compounds, or phytochemicals, in pomegranates can suppress aromatase and ultimately block cancer growth. They found that 10 natural compounds in the fruit may potentially prevent estrogen-related breast cancer.

Chen said the compounds would not be a replacement for aromatase inhibitors.

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