Bioengineered chewing gum reduces cancer-linked oral microbes

Researchers led by Henry Daniell of the School of Dental Medicine have shown that extracts from bioengineered chewing gum reduce the levels of three microbes known to be associated with head and neck squamous cell cancer (HNSCC), paving the way for more effective and affordable therapies. Their findings are published in Scientific Reports.

Head and neck squamous cell carcinoma (HNSCC) is a common cancer that develops in the lining of the mouth and throat. It can be aggressive and often has poor outcomes, especially when diagnosed at advanced stages, says Daniell. He notes that most recently approved cancer drugs have not significantly improved quality-of-life or five-year survival rates, underscoring the need for better therapies.

Building from their previous work using a chewing gum made from lablab beans (bean gum) containing the naturally antiviral protein FRIL, Daniell and colleagues examined the levels of three microbes linked to cancer-human papilloma virus, or HPV, and two species of bacteria, Porphyromonas gingivalis (Pg) and Fusobacterium nucleatum (Fn)-in oral samples from patients with HNSCC.

The global increase in oropharyngeal cancer is linked to HPV infection. And Pg and Fn infections worsen survival rates of untreated recurrent or metastatic oral cancer, even after surgery and risk-adjusted adjuvant, or supplemental, therapies."

Henry Daniell, School of Dental Medicine

They found that bean gum extracts reduced HPV levels by 93% in saliva samples and by 80% in oral rinse samples. When they bioengineered the bean gum to also contain protegrin, an antimicrobial peptide that can kill harmful bacteria, they found that a single dose reduced the levels of Pg and Fn to almost zero without affecting the beneficial bacteria normally found in the mouth. This contrasts with radiation therapy, which both reduces beneficial bacteria and increases disease-causing yeast (Candida albicans).

"Lip and oral cavity cancer was the seventh leading cancer type in cancer incidence and mortality rate worldwide in adolescents, young adults, and middle-aged adults in 2022," says Daniell. "Our findings support the value of advancing these therapies to clinical trials as adjuvants with current treatments or as prophylaxis to prevent infection and transmission."