A new study by scientists including one of an Indian origin has found that aspirin slowed the growth of breast cancer cell lines in the lab and significantly reduced the growth of tumours in mice.

The age-old headache remedy also exhibits the ability to prevent tumour cells from spreading.

Results of the study by researchers at the Veterans Affairs Medical Center in Kansas City, Mo., and the University of Kansas Medical Center, suggested that regular use of low-dose aspirin might prevent the progression of breast cancer in humans.

Anecdotal evidence indicated that breast cancer was less likely to return in women who took aspirin to lower their risk of heart attack or stroke. But the science behind this relationship is not well understood.

The VA study found that aspirin might interfere with cancer cells` ability to find an aggressive, more primordial state. In the mouse model the researchers used, cancer cells treated with aspirin formed no or only partial stem cells, which are believed to fuel the growth and spread of tumours.

Senior author Sushanta Banerjee, director of the cancer research unit and a professor at the University of Kansas Medical Center in Kansas City, Kan, said that first-line chemotherapy treatments do not destroy stem cells.

Eventually, the tumour will grow again. "If you don`t target the stemness, it is known you will not get any effect. It will relapse," said Banerjee, a professor of medicine in division of hematology and oncology.

In lab tests, aspirin blocked the proliferation of two different breast cancer lines. One of the lines tested is often called triple-negative breast cancer, a less common but more difficult treat form of the disease. "We are mainly interested in triple negative breast cancer, because the prognosis is very poor," Banerjee stated.

Triple-negative breast cancers, which will be addressed in a special thematic program at the ASBMB annual meeting, lack receptors for estrogen, progesterone and Her2. Aspirin also may improve the effectiveness of current treatments for women whose breast cancers are hormone-receptor positive.

In the team`s study, aspirin enhanced the effect of tamoxifen, the usual drug therapy for hormone-receptor positive breast cancer.

Aspirin is used in the treatment of a number of different conditions. Banerjee said its ability to attack multiple metabolic pathways is what makes it potentially useful in the fight against cancer.

Aspirin is a medicine with side effects, including gastrointestinal bleeding. Researchers will continue to explore if the positive effects of regular use of the drug outweigh the risks.

The lead author of the study, Gargi Maity, a postdoctoral fellow who works in the cancer research unit at the VA Medical Center, presented the team`s findings at the annual meeting of the American Society for Biochemistry and Molecular Biology, which is being held in conjunction with the Experimental Biology 2013 conference in Boston.