A person’s teeth could offer an unexpected indicator of survival after pancreatic cancer surgery. Patients who had at least 21 natural teeth lived nearly two years longer on average than those with fewer teeth. Researchers believe oral health may reflect long-term exposure to inflammation, poor nutrition, frailty, and other health challenges.
Researchers at Hiroshima University examined whether oral health could help predict long-term outcomes for patients undergoing surgery for pancreatic ductal adenocarcinoma (PDAC), an aggressive type of pancreatic cancer. Earlier studies have also linked poor oral health to outcomes in colorectal and esophageal cancers, as well as to complications following pancreatic cancer surgery.
The new research moved beyond short-term surgical complications to examine survival following resection, a procedure that removes part or all of an organ. The study was published in the Journal of Hepato-Biliary-Pancreatic Sciences on April 23, 2026.
How Oral Health May Influence Cancer Survival
Kenichiro Uemura, an associate professor at Hiroshima University’s Graduate School of Biomedical and Health Sciences and the study’s corresponding author, noted that pancreatic cancer remains among the world’s deadliest cancers, with patients often facing poor outcomes even after potentially curative surgery. He explained that recent studies have linked periodontal bacteria, including Porphyromonas gingivalis, to the development and progression of pancreatic tumors. However, researchers have not yet established whether a patient’s overall oral health directly affects survival after pancreatic cancer surgery.
The study included 339 consecutive patients who underwent radical pancreatectomy—the surgical removal of part or all of the pancreas, sometimes together with nearby organs—at Hiroshima University Hospital from 2014 to 2022.
All patients underwent dental evaluations before surgery. Researchers documented the number of remaining natural teeth and assessed posterior occlusion, or how well the upper and lower back teeth come together during chewing.
More Natural Teeth Associated With Longer Survival
The survival gap between the groups was considerable. Patients who had at least 21 natural teeth had a median overall survival of 60.7 months, equivalent to just over five years. In comparison, those with 20 or fewer teeth had a median survival of 39.1 months, or a little over three years.
The link between tooth count and survival remained even after researchers accounted for important factors that could influence the findings, such as tumor stage, lymph node involvement, surgical margins, chemotherapy, and nutritional condition.
Uemura highlighted the substantial survival gap between the two groups, noting that patients with more natural teeth lived nearly two years longer on average than those with fewer teeth.
He also noted that posterior tooth contact did not independently predict survival. This indicates that tooth loss may reveal more than a person’s oral function. It could instead serve as a marker of long-term inflammation, frailty, nutritional health, lifestyle habits, and overall vulnerability that builds up over many years. In other words, the condition of the mouth may provide a window into the body’s long-term resilience.
Tooth Loss May Reflect Long-Term Health
The difference between the number of teeth a person has and their chewing ability may be particularly significant. If poor chewing function were the primary factor behind the survival gap, posterior occlusion would also be expected to predict outcomes. Since it did not, the researchers suggest that tooth loss may instead act as a visible indicator of a person’s long-term health history.
Several factors can contribute to tooth loss, including periodontal disease, smoking, diet, limited access to dental care, chronic health conditions, and aging. These same factors may influence how well the body copes with major surgery, chemotherapy, inflammation, and the physical demands of cancer. However, the study could not determine which of these mechanisms was responsible for the observed difference in survival.
Because the research was conducted at a single hospital and involved patients of Japanese ethnicity, the findings may not apply broadly to other populations. Larger, multicenter studies involving more diverse groups will be necessary to confirm the association. Researchers also plan to explore whether oral bacteria and persistent inflammation directly contribute to the progression of pancreatic cancer.
Uemura concluded that pancreatic cancer care could eventually take a broader approach, considering not only tumor biology but also a patient’s long-term overall health and oral condition. He said the researchers hope oral health evaluations could one day become part of personalized risk assessment and perioperative care for people undergoing treatment for pancreatic cancer.
Read the original article on: SciTechDaily
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