PALO ALTO - In a study on laboratory mice, researchers at the Stanford University School of Medicine have shown that bouts of relatively short-term stress can boost the immune system and protect against one type of cancer.

The researchers also said that the beneficial effects of this occasional angst could last for weeks after the stressful situation has ended.

The finding is surprising because chronic stress has the opposite effect-taxing the immune system and increasing susceptibility to disease.

“This is the first evidence that this type of short-lived stress may enhance anti-tumor activity. This is a promising new way of thinking that calls for more research. We hope that it will eventually lead to applications that help us to care for those who are ill, by maximally harnessing the body’s natural defenses while also using other medical treatments,” said Dr. Firdaus Dhabhar.

The researchers studied a particular type of skin cancer called squamous cell carcinoma that is known to be vulnerable to attack by the immune system.

Certain types of stress, such as the so-called fight-or-flight response to an immediate but temporary threat, has been shown to increase the recruitment of immune cells to the surface of the skin and the surrounding lymph nodes-presumably in preparation for imminent injury.

“Acute stress galvanizes an organism’s protective systems. But although it’s one of nature’s fundamental survival systems, thus far it’s been rather underappreciated,” said Dhabhar.

The researchers focused on understanding the physiological effects of both acute and chronic stress.

They investigated the effect of short-term, or acute, stress on 30 laboratory mice exposed for 10 weeks to thrice-weekly doses of cancer-causing ultraviolet light.

They found that fewer of the mice that had been acutely stressed developed skin cancer during weeks 11 through 21, and that those that did exhibited a lower total amount of tumors (a measurement called tumor burden) than the non-stressed mice.

The stressed mice weren’t protected indefinitely-almost 90 percent of the mice in both groups developed cancer after week 22, though the stressed group continued to have fewer tumors until week 26.

“It’s possible that the pre-tumor cells were eliminated more efficiently in the group that was stressed.

There may also have been a longer-term enhancement of immunity as we have seen in our non-cancer-related studies. However, acute stress did not lower tumor burden beyond week 26. We are in the process of determining why,” said Dhabhar.

However, other stress-induced changes lingered for weeks.

The researchers found that, during the same time period, the skin of the stressed mice had higher levels of immune-activating genes than did the control group, almost as if the mice were preparing for battle.

He compared the effect to how drug-makers often increase the potency of vaccines by including generic immune-activating molecules called adjuvants.

But he is convinced that acute stress may be better for us than most of us think, and that bio-behavioral interventions are worth investigating.

The study will be published in the journal Brain, Behavior, and Immunity.

TEL-AVIV -  A study conducted by Israeli researchers suggests that exposure to light, and possibly photosynthesis, may help disease-causing bacteria to invade fresh produce, making them impervious to washing.

According to background information in a report published in journal Applied and Environmental Microbiology, past studies have already shown that salmonella enterica attaches to the surface of fresh produce, and finds its way below the surface of the skin through pores called stomata, where it can hide from and resist washing and food sanitizers.

In the new study, researchers from the Agricultural Research Organization at the Volcani Center in Israel and Tel-Aviv University examined the role that light and photosynthesis might play on the ability of salmonella bacteria to infiltrate lettuce leaves via stomata.

They exposed sterile iceberg lettuce leaves to bacteria either in the light, in the dark, or in the dark after 30 minutes of exposure to light.

Incubation in the light or pre-exposure to light resulted in aggregation of bacteria around open stomata and invasion into the inner leaf tissue.

Incubation in the dark, on the other hand, resulted in a scattered attachment pattern and very little internalization.

According to the researchers, the increased propensity for internalization in the light may be due to several factors.

First, they say, in the absence of light plants enter a period of dormancy, where stomata are closed and no photosynthesis takes place. In the light, the stomata are open.

Additional findings also suggest that the bacteria are attracted to the open stomata by the nutrients produced during photosynthesis, which are not present in the dark.

“The elucidation of the mechanism by which Salmonella invades intact leaves has important implications for both pre- and postharvest handling of lettuce and probably other leafy vegetables. The capacity to inhibit internalization should limit bacterial colonization to the phylloplane and consequently might enhance the effectiveness of surface sanitizers,” say the researchers.

LONDON - Some social networking sites, like Facebook, could help improve a person’s working memory, according to an expert.

Dr. Tracy Alloway, a psychologist at Stirling University, says that working memory - the ability to recall things over a short period of time - could be the key to success.

She believes that it may be possible to train the brain’s working memory just like an athlete trains muscles, reports the Independent.

Alloway said that some technological inventions, such as Facebook, might actually improve working memory because they require people to hold a lot of information in their heads.

However, other such websites, like spell-checks and Twitter, which requires only small bite-sized phrases, may work against improving working memory.

Instead, these websites could be contributing to some people’s lack of success, she suggested.

Alloway said that she had devised an on-line game that can improve working memory, which may help the young develop working memory skills as well helping to combat memory loss in the elderly.

SYDNEY - A new study has determined animals that process information using a preferred hemisphere of the brain fare better those who use both sides of their brain simultaneously.

According to a report by ABC News, the study suggests the brain operates like a dual processor in a computer, with each of the brain’s two sides kicking into action depending on the content or context of the information.

Dr Culum Brown of the Department of Biological Sciences at Macquarie University in Sydney, and colleague Maria Magat, focused their research on several different types of Australian birds, such as gang-gangs, sulfur-crested cockatoos and Australian king parrots.

All of the birds participated in two tests designed to test their cerebral lateralisation, meaning how strongly each bird preferentially processes information using either hemisphere of the brain.

The first task was a simple pebble-seed discrimination test, where the birds had to pick seeds out of a background of similar sized pebbles.

The second task was more demanding.

The researchers attached food to the end of a suspended string that the birds had to manipulate with their beaks and feet in order to get the tasty reward.

Birds with a preference for using either of their eyes or either of their legs did better than birds that used both eyes and both legs equally.

This means that the most successful birds have a very strong cerebral lateralisation, which “is influenced by both genes and experience,” according to Brown.

He and Magat found that the pattern of lateralisation, left or right bias, did not predict success as much as the strength of the particular bias did.

Carrying the findings over to humans, this suggests, in part, that a right-handed person isn’t more successful than a left-handed one, and vice-versa.

But people who always favour a certain hand, foot or eye for certain tasks will likely perform better than those who don’t exhibit obvious preferences.

Brown said that there are several reasons why such specialized division of the brain confers benefits to the individual.

“Firstly, it means that a given hemisphere can become increasingly specialized at processing certain types of information,” he said.

According to Brown, assigning particular tasks to each side of the brain avoids conflict between the two hemispheres, and allows “multiple sources of information to be processed simultaneously, that is to say, animals can multitask like a dual processor in a computer.”

NEW YORK - New evidence suggests that daily nasal irrigation may increase the risk of sinus infections.

Nasal irrigation with warm saline has been promoted as way to cleanse the sinuses and help prevent infections. However, using this therapy too often may not be beneficial.

The latest study, presented at the American College of Allergy, Asthma, & Immunology (ACAAI) annual meeting, included 68 adults who used nasal irrigation frequently for one year and then stopped therapy for one year. The patients were compared to 24 control patients who did not discontinue nasal irrigation.

The researchers found that number of sinus infections decreased by 62.5 percent after the participants stopped using nasal irrigation. Additionally, after stopping nasal irrigation, they were 50 percent less likely to develop sinus infections than those who continued with daily therapy.

Mucus in the nose contains important immune system molecules that help the body fight against infections. Because nasal irrigation eliminates this mucus, the authors suspect that it may lead to an increased risk of infection.

CAIRO - Rich Egyptians living 3,500 years ago may have been walking around with the same clogged arteries that modern Americans now battle, according to a presentation Monday at the American Heart Association’s annual meeting.

A group of scientists said that, on a whim, they performed a computerized tomography (CT) scan on a collection of 22 mummies housed at the Egyptian National Museum of Antiquities in Cairo to see if they too suffered from the plaque build-up in arteries that lead to coronary artery disease.

“We didn’t believe it was going to be so intense,” said Adel H. Allam, the lead author of a letter to the editor published Tuesday in the Journal of the American Medical Association. “We thought that we would find it, but maybe very rarely, and we thought that if we did find it, it wouldn’t be so severe.”

The plaque was, of course, long gone. The mummies lived between 1981 B.C. and 364 A.D., and only 16 of the mummies had heart tissue left. However, doctors could see evidence of advanced atherosclerosis (plaque build-up that causes hardening of the arteries) by looking for calcium deposits in a CT scan used to diagnose people today.

SEATTLE - Researchers in the US have made a breakthrough discovery which could bring a cure for colour blindness and other diseases that can lead to a total loss of sight.

Using gene therapy, the boffins successfully treated a pair of squirrel monkeys that could not differentiate between red and green.

The development could bring new treatments for a variety of different diseases that are triggered by faulty cone cells at the back of the eye. The problem can lead to diseases such as macular degeneration, which often causes complete blindness.

The research, which was led by Jay Neitz, professor of ophthalmology at the University of Washington, has been published in the scientific journal Nature, reports The Daily Express.

Professor Neitz said: “People who are colour blind often feel that they are missing out. If we could find a way to do this with complete safety in human eyes, as we did with monkeys, I think there would be a lot of people who would want it.

“Beyond that, we hope this technology will be useful in correcting lots of different vision disorders.”

NEW YORK - A new study hints that good oral care - regular brushing and flossing and trips to the dentist — may help aging adults keep their thinking skills intact.

In a study, researchers found that adults aged 60 and older with the highest versus the lowest levels of the gum disease-causing pathogen Porphyromonas gingivalis were three times more likely to have trouble recalling a three-word sequence after a period of time.

Dr. James M. Noble of Columbia College of Physicians and Surgeons in New York City and colleagues also found that adults with the highest levels of this pathogen were two times more likely to fail three-digit reverse subtraction tests.

The findings, reported in the Journal of Neurology, Neurosurgery, and Psychiatry this month, are based on more than 2300 men and women who were tested for periodontitis and completed numerous thinking skills tests as part of the National Health and Nutrition Examination Survey III conducted between 1991 and 1994.

Overall 5.7 percent of the adults had trouble completing certain memory tasks and 6.5 percent failed reverse subtraction tests. Participants with the highest (greater than 119 units) versus the lowest (57 units or lower) pathogen levels were most likely to do poorly in these tests.

Research has already established a strong association between poor oral health and heart disease, stroke and diabetes, as well as Alzheimer’s disease. Gum disease could influence brain function through several mechanisms, the researchers note; for example, gum disease can cause inflammation throughout the body, a risk factor for loss of mental function.

In a related commentary, Dr. Robert Stewart, of King’s College in London, United Kingdom, says this study adds to a “quietly accumulating” body of evidence tying oral and dental health with brain function.

SOURCE: Journal of Neurology, Neurosurgery, and Psychiatry, November 2009

TEL AVIV -  Tel Aviv University researchers have invented a technique to destroy malignant cells in the breast while leaving healthy ones untouched. If the results produced in lab tests on mice can be applied to human patients, the result could be a revolution in cancer care, though human clinical tests are years away, at best.

The killing of cancerous cells in the lab was accomplished by using a chemical generally used to treat strokes. The work by Prof. Malka Cohen-Armon of TAU’s Sackler Medical School was just published in the open online journal, BioMed Central.

The international research team she headed found that potent phenanthridine derived polyADP-ribose polymerase (PARP) inhibitors that were originally designed to protect cells from cell death under stress conditions such as stroke or inflammation efficiently eradicate MCF-7 and MDA231 breast cancer cells without impairing normal cells.

Cohen-Armon said they made the discovery “by chance,” but that the findings provide “a new therapeutic approach for a selective eradication of abundant human cancers.”

LONDON - Scientists in the University of Leicester’s Department of Genetics have for the first time revealed that the male and female do truly communicate -at least at the fundamental genetic level.

The research counters scientific theory that the X and Y chromosomes - that define the sexes - do not communicate at all.

In the study, Dr. Zoe Rosser and colleagues have shown that exchange of DNA does actually occur between the X and Y in the regions previously thought to be completely isolated.

“Recently it was shown that the Y chromosome can talk to itself - swapping bits of DNA from one region to another, and potentially giving it a way to fix mutations that might affect male fertility. In this new research we’ve now shown that it actually maintains a genetic conversation with the X chromosome, potentially giving it a way to fix other kinds of mutations, too. So, maybe it’s not quite the dysfunctional loner we have always imagined it to be,” said Professor Mark Jobling, who led the study.

It is the Y chromosome in men that determines maleness by triggering development of testes rather than ovaries in the early embryo.

“These days the X and Y are a very odd couple, but long ago, before mammals evolved, they were an ordinary pair of identical chromosomes, exchanging DNA in a companionable way through the process of genetic recombination. However, once the Y chromosome took on the job of determining maleness, they stopped talking to each other. The X remained much the same, but the Y set out on a path of degeneration that saw it lose many of its genes and shrink to about one third the size of the X. Some scientists have predicted that it will eventually vanish altogether,” said Jobling.

“These new findings from the Department of Genetics of the University of Leicester now challenge this interpretation of the Y chromosome’s fate,” he added.

The researchers discovered that the conversation between the X and Y chromosome goes both ways, and it is also clear that mutations arising on a decaying Y chromosome can perhaps be passed to the X - the Y chromosome’s revenge.

In future, the researchers will assess how widespread X-Y exchanges have been during evolution, and what the likely functional effects might be.

The study has been published in the American Journal of Human Genetics.

EXETER, UK - Encouraging elderly to talk about old times can actually improve their memory and limit effects of dementia, finds a new study.

The research team led by Professor Catherine Haslam, at the University of Exeter, showed that ‘reminiscence therapy’ can significantly increase cognitive recall and agility of the mind by up to 12 per cent within six weeks.

During the study, the researchers recruited 73 people - aged between 70 and 90 and some with dementia - and split them into three groups.

The first group was made to sit around once a week in sets of five and reminisce about the old days such as childhood, weddings and family holidays, as well objects that could spark memories such as old-fashioned ink pots and hats.

After six weeks, the standard cognitive tests showed that the memory had improved by 12 per cent. Those suffering dementia saw an improvement of about eight per cent.

In contrast, the two other groups - one that was encouraged to play skittles - and another that was encouraged to have one on one chats showed very little improvement in their brain power.

“The people we were talking to were more than happy to bring up the war. It emerged as a very important part of their lives. As well as it improving their memory some people found it incredibly enjoyable,” the Telegraph quoted Prof Haslam, a neuropsychologist as saying.

“It doesn’t actually reverse dementia but it seems to make the most of their residual abilities,” she added.

Professor Alex Haslam, her husband, who was also carrying out research into social groups at the university, said the result were very significant.

“If you had a drug that could do that you would that you would make a lot of money. The drug in this case is the social group,” he said.

DENVER - Scientists from University of Colorado have revealed that inhaling measles vaccine can be more effective in combating the disease that causes 197,000 deaths each year globally.

While a liquid vaccine using a hypodermic needle is presently the only way to prevent the disease, they are often difficult to store, costly to transport and may be prone to contamination when shipped to developing countries.

The study led by Dr Robert Sievers shows promise for a new method that allows the patient to inhale a finely-powdered medicine.

In order to produce the inhalant, the weakened measles virus must be mixed with high-pressure carbon dioxide to produce microscopic bubbles and droplets, which are then gently dried to produce an inhalable powder.

The powder is then puffed into a small inhaler-like device and administered.

The aerosol vaccine was shown effective in test animals, and human trials are expected to begin next year in India, where more than half of the world’s measles cases occur.

Aridis Pharmaceuticals have been working to develop a room temperature stable measles formulation that can be easily inhaled using cost-effective dry-powder inhalers in collaboration with the non-profit foundation PATH.

“There is a need for technologies that could stabilize the measles vaccine, as this would facilitate mass vaccination in developing world countries where transport, storage, administration costs and other complexities have limited vaccine coverage by 70 percent,” said Dr Satoshi Ohtake, from Aridis and the study’s principal investigator.

Ohtake’s study used a combination of mild spray drying process conditions and unique stabilizers to produce stable dry powders with excellent preservation of vaccine activity.

The potency of the dried vaccine was then tested while being stored at different Temperatures over several week-long periods.

The results found that the dry-powdered aerosol was stable for at least eight weeks at 37 degrees Celsius.

“This new method could potentially offer safer, more affordable and effective treatments to patients that need them the most,” Ohtake added.

TORONTO - In a major breakthrough for early cancer detection, Canadian researchers have developed an inexpensive microchip that is sensitive enough to detect the type and severity of the disease.

The microchip has been successfully tested on prostate cancer, and head and neck cancer models.

It can also be used to diagnose other cancers, as well as infectious diseases such as HIV and the H1N1 flu.

Researchers at the University of Toronto here used nanomaterials for the first time to build the sensitive microchip.

In their work reported in Nature Nanotechnology this week, the researchers say the new device will make sophisticated molecular diagnostics easily available soon.

“The remarkable innovation is an indication that the age of nanomedicine is dawning,” David Naylor, who is president of the University of Toronto and professor of medicine, was quoted as saying in a university statement.

The device quickly picks up the ‘biomarkers’ that hint at the presence of cancer at the cellular level, even though these biomolecules - genes that indicate aggressive or benign forms of the disease - are generally present at low levels in biological samples, the statement said.

Analysis can be completed in 30 minutes, compared to days taken by the current diagnostic procedures.

“Today, it takes a room filled with computers to evaluate a clinically relevant sample of cancer biomarkers and the results aren’t quickly available,” said research leader and medicine professor Shana Kelley.

“Our team was able to measure biomolecules on an electronic chip the size of your fingertip and analyse the sample within half an hour. The instrumentation required for This analysis can be contained within a unit the size of a BlackBerry,” she said.

Since the current conventional, flat metal electrical sensors are inadequate to sense cancer’s particular biomarkers, the Toronto team fabricated a chip and decorated it with nanometre-sized wires and molecular ‘bait’ to make it more sensitive.

“Uniting DNA with speedy, miniaturised electronic chips is an example of cross-disciplinary convergence,” said co-researcher Ted Sargent.

“By working with outstanding researchers in nanomaterials, pharmaceutical sciences, and electrical engineering, we were able to demonstrate that controlled integration of nanomaterials provides a major advantage in disease detection and analysis,” he said.

ISTANBUL - The Turkish man crowned as the world’s tallest man suffers from a pituitary tumor which has resulted in his gigantic height.

Sultan Kosen stands eight-foot-one-inch tall and was unveiled as the tallest man in the world by the Guinness World Records. Kosen’s height is a result of a tumor in his pituitary gland, which has led to an over production of growth hormones, reports the National Geographic News.

The condition called pituitary gigantism has also led his feet to grow to almost 15 inches, while his hands are larger than 10 inches. It was only after the tumor was removed last year, that Kosen stopped growing.

The 27-year old is forced to use crutches as his height has weakened his knee joints.

The now-famous Kosen wants to travel around the world and meet a woman who would like to marry him.

NEW YORK (Reuters Health) - Men with earlier-stage prostate cancer may have better survival odds if they get a little more than the recommended amount of vitamin B6 everyday, a new study suggests.

The findings, reported in the American Journal of Clinical Nutrition, do not prove that vitamin B6 improves prostate cancer survival. But they do point to an association between survival and amounts of the vitamin that are readily attainable through a balanced diet.

Researchers found that among 525 Swedish men with prostate cancer, the one-quarter with the highest B6 intakes were 29 percent less likely than those with the lowest intakes to die of the disease during the study period.

Men in the former group averaged 2.2 to 2.9 milligrams of vitamin B6 per day, while those in the latter group got 1.3 to 1.9 milligrams daily. The recommended vitamin B6 intake for men age 50 and younger is 1.3 mg per day, while older men are encouraged to get 1.7 mg.

The protective effect of B6 appeared confined to men whose tumors had not yet spread beyond the prostate at the time of diagnosis.

When the researchers considered only these men, they found that those who got the most B6 had only 5 percent of the risk of dying as their counterparts with the lowest intakes of the vitamin.

The results offer “exciting preliminary support” for dietary factors in long-term prostate cancer survival, according to lead researcher Dr. Julie L. Kasperzyk, a post-doctoral fellow at the Harvard School of Public Health in Boston.

However, she told Reuters Health, the findings “will need to be confirmed or refuted in additional, larger studies before recommendations can be made to the general public or to prostate cancer patients.”

Vitamin B6 is found in a range of foods, including beans, potatoes, bananas, meat, chicken, peanut butter and certain fish, like salmon and tuna. It serves a variety of functions in the body — one being its role, together with other B vitamins, in DNA synthesis and repair.

Cancer arises from the uncontrolled growth of genetically abnormal cells — which, in theory, means that the B vitamins could affect the development or spread of certain cancers.

For their study, Kasperzyk and her colleagues looked at the intakes of vitamins B6, B12, folate, riboflavin and methionine among 525 prostate cancer patients who were followed for up to 20 years. Few men took dietary supplements, Kasperzyk said, so the study focused on consumption from food.

Overall, 42 percent of the men died of prostate cancer during the study period. The odds were lower, however, among those with the highest vitamin B6 intakes — although there was no evidence of protection among men diagnosed with advanced cancer.

None of the other nutrients was linked to prostate cancer survival.

Kasperzyk said that vitamin B6 has a number of functions in the body that are not shared by the other nutrients her team studied.

“What is most relevant to prostate cancer,” she explained, “is the potential link between vitamin B6 and reduced responsiveness of the prostate to testosterone.”

CHINA — Researchers in China, who conducted a review of research studies, say a diet that includes flaxseed may help lower cholesterol levels.

The review of 28 studies, which involved more than 1,500 people, found cholesterol reduction linked with eating whole flaxseed was stronger in women than men.

Study leader Dr. Xu Lin of the Chinese Academy of Sciences in Shanghai says one tablespoon daily of whole flaxseed or flaxseed oil is usually associated with reductions in total cholesterol and low-density lipoprotein, or LDL, the “bad” cholesterol — particularly post-menopausal women, more than men, and in people with higher cholesterol concentrations at the outset.

However, the whole flaxseed did not appear to significantly alter trigylceride levels or affect the amount of high-density lipoprotein, or HDL, the “good” cholesterol.

Flaxseed is considered healthy for the heart because it contains high amounts of omega-3 fatty acids, fiber and alpha linolenic acid.

The review was published in the American Journal of Clinical Nutrition.

LONDON - Scientists at the University College London have found that the hippocampus in the brain is responsible for our ability to organise the world into separate concepts.

Forming a concept involves selecting the important characteristics of our experiences and categorising them.

The degree to do this effectively is a defining characteristic of human intelligence.

However, not much is known about how conceptual knowledge is created and used in the brain.

Thus, to identify the brain regions responsible, Dharshan Kumaran and colleagues at the Wellcome Trust Centre for Neuroimaging, UCL, showed 25 volunteers, pairs of fractal patterns that represented the night sky and asked them to forecast the weather - either rain or sun - based on the patterns.

Conceptual rules based on the positions and combinations of the patterns governed whether the resulting outcome would be rain or sun, but the volunteers were not told this.

Instead, they rewarded correct predictions with cash prizes, encouraging the volunteers to deduce these conceptual rules.

In an initial learning phase, the different possible combinations were repeatedly shown to the participants, so that they could make their predictions by simply memorising previous outcomes and could also begin to realise that rules based on the positions and combinations of the patterns governed whether the result would be rain or sun.

In a second phase, the volunteers were provided with less information to encourage them to apply the rules they had identified, which made the researchers to separate those volunteers who had formed the concept in the learning phase from those who hadn’t.

During both experiments fMRI scanning was used to identify areas of brain activity.

It was found that in the first phase, they could tell if a volunteer would go on to apply concepts in the second phase by the degree of activity in their hippocampus, which is known to be responsible for learning and memory.

In the second phase, activity centred on the ventromedial prefrontal cortex (vMPFC), important in decision-making, was active.

The team concluded that the hippocampus creates and stores concepts, and passes this information onto the vMPFC where it is put to use during the making of decisions.

People with amnesia are also known to have problems forming concepts, so Kumaran is expecting his findings to lead to the development of improved teaching methods and other tools for the treatment of amnesiacs.

The study has been published in the journal Neuron.

A molecule found in a curry ingredient can kill esophageal cancer cells in the laboratory, suggesting it might be developed as an anti-cancer treatment, scientists said on Wednesday.

Researchers at the Cork Cancer Research Center in Ireland treated esophageal cancer cells with curcumin, a chemical found in the spice turmeric, which gives curries a distinctive yellow color, and found it started to kill cancer cells within 24 hours.

The cells also began to digest themselves, they said in a study published in the British Journal of Cancer.

Previous scientific studies have suggested curcumin can suppress tumors and that people who eat lots of curry may be less prone to the disease, although curcumin loses its anti-cancer attributes quickly when ingested.

But Sharon McKenna, lead author of the Irish study, said her research suggested a potential for scientists to develop curcumin as an anti-cancer drug to treat esophageal cancer.

Cancers of the esophagus kill more than 500,000 people across the world each year. The tumors are especially deadly, with five-year survival rates of just 12 to 31 percent.

The curcumin used “an unexpected system of cell messages” that caused the cancer cells to die, McKenna said.

Normally, faulty cells die by committing programmed suicide, or apoptosis, which occurs when proteins called caspases are “switched on” in cells, the researchers said.

But these cells showed no evidence of suicide, and the addition of a molecule that inhibits caspases and stops this “switch being flicked’ made no difference to the number of cells that died, suggesting curcumin attacked the cancer cells using an alternative cell signaling system.

In 2007, U.S. researchers said they had found curcumin may help stimulate immune system cells in Alzheimer’s disease.

TEL-AVIV -  Scientists at Tel Aviv University have developed a novel drug that delivers anti-cancer compounds straight to the tumor.

Lead researcher Dr. Ronit Satchi-Fainaro believes that the new invention may alleviate particularly malicious forms of cancers like osteosarcomas and bone metastases and combat resistance to anti-cancer drugs like Taxol, keeping other normal healthy cells around the tumor safe.

Most of us have small tumors in our body at all times. They start the size of a pinhead and usually remain at that size as dormant and asymptomatic tumors. Then, at some point, cancer cells proliferate and the tumor grows in mass.

At that point the tumor cells migrate to the bones and start recruiting blood vessels using a chemical attractant in order to draw blood for their continued growth in a process called angiogenesis.

The researchers looked into the chemical that causes the blood, or endothelial cells, to gravitate to the activated, newly malignant cancer cells.

According to Satchi-Fainaro, the innovative drug delivery system delivers compounds like Taxol known to stop blood vessel growth to cancerous tumors.

She bound existing cancer drugs to an inert polymer that doesn’t react with the immune system.

“Like a stealth airplane,” she says, the polymer passes through the body’s defense system unnoticed.

Then, programmed to find the tumour using the bisphosphonate drug Alendronate, a drug that binds to bones, the carrier delivers its cancer-killing payload.

The study conducted over animal models, found that the researchers were able to reverse the growth of bone cancer tumors.

In a second study, she found that loading her polymer with the anti-cancer drug Taxol could inhibit tumor growth by 50pct, compared to a Taxol dose that had no effect on tumor growth at all.

The study is published is published in prestigious journals Angewandte Chemie and PLoS One.