Oral Microbiome Linked to Increased Pancreatic Cancer Risk

A recent study published in the journal JAMA Oncology suggests a significant link between oral bacteria and fungi and an elevated risk of pancreatic cancer. Researchers from New York University found that specific microorganisms residing in the mouth could substantially increase the likelihood of developing this deadly disease.

Study Details and Findings

The study, led by New York University researchers, analyzed data from 122,000 participants involved in the "American Cancer Society Cancer Prevention Study II" and the "Prostate, Lung, Colorectal and Ovarian Cancer Screening Trial." Saliva samples were collected from participants after they rinsed with an oral rinse. These samples were then analyzed to determine the composition of the oral microbiome. Participants were followed for an average of nine years. During this period, 445 individuals were diagnosed with pancreatic cancer.

Researchers compared the oral microbial DNA of the 445 pancreatic cancer patients with that of 445 cancer-free control subjects. The analysis revealed that the presence of specific bacteria, known to cause periodontal disease, was correlated with an increased risk of pancreatic cancer. These bacteria include:

• Porphyromonas gingivalis
• Eubacterium nodatum
• Parvimonas micra

Furthermore, the study identified Candida species, a type of yeast, as another factor contributing to a higher risk of pancreatic cancer. Overall, the research indicated that specific groups of bacteria and fungi could increase the risk of developing pancreatic cancer by as much as 3.5 times.

The research team stated, "This study provides important evidence that the oral microbiome may be involved in the development of cancer."

It's important to note that while the study demonstrates a strong correlation, it does not establish a direct causal link between specific microorganisms and the development of pancreatic cancer. Further research is needed to confirm this connection.

Factors Contributing to Oral Microbiome Imbalance

The proliferation of bacteria and fungi in the mouth can be exacerbated by several factors, including:

• Poor oral hygiene: Neglecting regular brushing and flossing allows food debris and plaque to accumulate.
• Weakened immune system: Conditions such as diabetes, aging, and chronic illnesses can compromise the immune system, leading to increased microbial growth.
• Antibiotic use: Prolonged antibiotic use can disrupt the balance of oral bacteria, reducing beneficial strains and allowing fungi to overgrow.
• Inhaled steroid use: Failing to rinse the mouth after using inhaled steroids can also promote fungal growth.
• Dry mouth: Reduced saliva production creates an environment conducive to bacterial and fungal proliferation.
• Smoking and excessive alcohol consumption: These habits further contribute to an imbalance in the oral microbiome.

Reference: https://jamanetwork.com/journals/jamaoncology/article-abstract/2839132