Chewing gum is usually sold for fresh breath or flavor, but scientists are exploring a far more ambitious use for it.
A research team led by the University of Pennsylvania has created an engineered gum designed to reduce microbes associated with cancers of the mouth and throat.
In patient-derived oral samples, the gum’s ingredients sharply lowered a cancer-linked virus and two potentially harmful bacteria.
The idea comes from a growing understanding that cancer does not develop in isolation from the environment around it.
The human mouth is home to hundreds of kinds of microorganisms. Most are part of normal life, but some infections can increase cancer risk or may be linked to poorer outcomes after cancer develops.
Human papillomavirus, or HPV, is one of the clearest examples. HPV is extremely common, and most infections disappear without causing serious problems. However, certain high-risk types can remain in the body and cause changes in cells that may eventually lead to cancer.
HPV is now an important cause of oropharyngeal cancer, which affects parts of the throat including the tonsils and the base of the tongue. Rates of these cancers have increased in some populations. This has encouraged researchers to search for practical ways to reduce HPV in the mouth and throat.
Scientists are also examining bacteria that may influence cancer. Two species attracting attention are Porphyromonas gingivalis and Fusobacterium nucleatum. They are associated with unhealthy conditions in the mouth and have also been linked in research to several cancers and to worse outcomes in some patients.
Henry Daniell and colleagues at the University of Pennsylvania School of Dental Medicine tested whether a specially produced chewing gum could target all three microbes. Their research was published in Scientific Reports. The experiments used saliva and oral rinse samples from patients with head and neck squamous cell carcinoma.
This form of cancer begins in cells lining the mouth or throat. When caught early, treatment can be successful, but later-stage or recurrent disease can be much harder to manage. Treatment may also affect speaking, swallowing, eating and appearance, making quality of life an important concern.
The gum was made using lablab beans and contains a plant protein called FRIL. Earlier research showed that FRIL has antiviral properties. The researchers reasoned that putting the protein into gum could allow it to act directly in the mouth, where HPV may be present.
When extracts from the gum were added to saliva samples, HPV levels dropped by 93 percent. In oral rinse samples, the reduction was about 80 percent. These large decreases show that the gum material can interact strongly with the virus in laboratory testing.
The team then expanded the approach to bacteria. They engineered the bean material to contain protegrin, a substance that can destroy certain bacteria. A single treatment reduced P. gingivalis and F. nucleatum to nearly undetectable levels in the tested samples.
Killing bacteria is not automatically a good thing because the mouth needs a balanced community of microbes. Many bacteria help occupy space that might otherwise be taken over by harmful organisms. An ideal treatment would therefore remove selected threats without destroying the wider oral community.
According to the study, the gum treatment appeared to leave beneficial bacteria largely unharmed. That selectivity could be important for people receiving cancer treatment. Radiation therapy in the head and neck can disturb the mouth’s normal microbial balance and may contribute to problems such as overgrowth of Candida yeast.
A treatment delivered through chewing could also have practical advantages. The active material would be released close to the area of interest instead of traveling through the entire body first. Gum is also familiar, portable and potentially easier to use than many medical treatments.
The researchers believe the technology could eventually be studied as an added treatment for people already receiving cancer care. Another possibility is prevention, particularly if reducing oral HPV can lower transmission or persistent infection. These possibilities remain hypotheses until they are tested directly in people.
That distinction is crucial. The current study does not show that the gum prevents head and neck cancer, cures cancer or improves survival. It shows that extracts from the gum can greatly reduce selected microbes in oral samples under experimental conditions.
There are several steps between that result and a useful medical product. Human trials would need to determine how much gum people should chew, how often it should be used and whether active proteins remain effective in the changing conditions of a real mouth. Researchers would also need to watch carefully for allergic reactions, irritation and other unwanted effects.
Another major question is whether reducing these microbes changes cancer outcomes. A microbe can be associated with cancer without being the only cause of the disease. Even when a virus such as HPV plays a causal role, removing free virus from saliva after cancer has developed may not necessarily affect tumor cells that already contain viral material.
The bacterial findings also require careful interpretation. P. gingivalis and F. nucleatum may contribute to an unhealthy tumor environment, but cancer is driven by many interacting factors. Lowering these bacteria could prove helpful, have little clinical effect or work only for selected patients.
Even with those uncertainties, the study has notable strengths. It tested samples from people with the disease rather than relying only on simplified laboratory mixtures, and it targeted several microbes at once. The apparent preservation of helpful bacteria also makes the approach more interesting than a treatment that broadly kills everything in the mouth.
Overall, the research is an early but creative step toward using edible plant-made proteins as local therapies.
The dramatic reductions in HPV and two harmful bacterial species justify further testing, but clinical trials will be needed before anyone knows whether those laboratory effects translate into better health. If they do, a familiar everyday product could become an unexpectedly useful way to support head and neck cancer care.
If you care about cancer, please read studies that a low-carb diet could increase overall cancer risk, and vitamin D supplements could strongly reduce cancer death.
For more health information, please see recent studies about how drinking milk affects the risks of heart disease and cancer and results showing higher intake of dairy foods linked to higher prostate cancer risk.
Source: University of Pennsylvania.
