A small but informative clinical trial by Johns Hopkins investigators shows that a pill combining chemicals found in turmeric, a spice used in curries, and onions reduces both the size and number of precancerous lesions in the human intestinal tract.
In the study, published in the August issue of Clinical Gastroenterology and Hepatology, five patients with an inherited form of precancerous polyps in the lower bowel known as familial adenomatous polyposis (FAP) were treated with regular doses of curcumin (the chemical found in turmeric) and quercetin, an antioxidant in onions, over an average of six months. The average number of polyps dropped 60.4 percent, and the average size dropped by 50.9 percent, according to a team led by Francis M. Giardiello, M.D., at the Division of Gastroenterology, The Johns Hopkins University School of Medicine, and Marcia Cruz-Correa, M.D., Ph.D., at Johns Hopkins and the University of Puerto Rico School of Medicine.
"We believe this is the first proof of principle that these substances have significant effects in patients with FAP," says Giardiello.
Familial adenomatous polyposis is a disorder that runs in families and is characterized by the development of hundreds of colorectal adenomas (polyps) and eventual colon cancer. Recently, nonsteroidal anti-inflammatory drugs (NSAIDs) have been used to treat some patients with this condition, but these compounds often produce significant side effects, including gastrointestinal ulcerations and bleeding, according to Giardiello.
Previous observational studies in populations that consume large amounts of curry, as well as laboratory research on rodents have strongly suggested that curcumin -- a relatively innocuous yellow pigment extracted from turmeric, the powdered root of the herb curcuma longa and one of the main ingredients in Asian curries -- might be effective in preventing and/or treating cancer in the lower intestine, according to Cruz-Correa. She said curcumin has been given to cancer patients, and previous studies have demonstrated that is well tolerated at high doses.
Similarly, quercetin -- a member of a group of plant-derived polyphenolic anti-oxidant substances known as flavanoids (found in a variety of foods including onions, green tea and red wine) -- has been shown to inhibit growth of colon cancer cell lines in humans and abnormal colorectal cells in rodents.
Although these substances were administered together, due to relative dose levels it is Giardiello's belief that curcumin is the key agent.
"The amount of quercetin we administered was similar to what many people consume daily; however, the amount of curcumin is many times what a person might ingest in a typical diet, since turmeric only contains on average 3 percent to 5 percent curcumin by weight," says Giardiello. Because of this, he cautions that simply consuming curry and onions may not have the same effect as was produced in this study.
In the trial, five patients were selected from the Cleveland Clinic in Weston Fla. All patients had previously had their colons surgically removed. Four of the five patients retained the rectums, whereas the remaining patient had both colon and rectum removed and part of the small intestine adapted to serve as colon and rectum. All patients had five or more adenomas in their lower intestinal tract. None of the patients had taken NSAIDS for more than one week during the three months leading up to the study.
Participants were examined using a flexible sigmoidoscope before treatment was initiated and at three month intervals (range three to nine months) during treatment. Number and size of polyps were examined at each visit.
Each patient received 480 milligrams of curcumin and 20 milligrams of quercetin orally three times a day for six months and was told not to use NSAIDs for the duration of the study. Three patients followed treatment as prescribed. One patient did not follow the scheduled treatment doses between months three and six and was continued on therapy until the ninth month. A second patient dropped out of the study after the third month.
A decrease in polyp number was observed in four of the five patients at three months and four of the four patients at six months.
Side effects were minimal. One patient reported slight nausea and sour taste within a couple of hours of taking the pill, which went away within three days, and a second patient had mild diarrhea for five days.
"This study showed for the first time that curcumin treatment was efficacious in decreasing the number of polyps in patients with FAP, similarly to what has been seen with the use of synthetic NSAID agents, but with minimal side effects. Furthermore, we saw that adenomas found in the small intestine of our patients also responded to curcumin," says Cruz-Correa. She says a randomized clinical trial will be conducted between Johns Hopkins and University of Puerto Rico Comprehensive Cancer Center involving more patients. No date has been set for this trial.
Eric Vohr | EurekAlert!
Biofilm discovery suggests new way to prevent dangerous infections
23.05.2017 | University of Texas at Austin
Another reason to exercise: Burning bone fat -- a key to better bone health
19.05.2017 | University of North Carolina Health Care
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy