Researchers in Taiwan have found an increase in the risk for head and neck cancers among patients with diabetes mellitus (DM).
Researchers in Taiwan have found an increase in the risk for head and neck cancers among patients with diabetes mellitus (DM). In patients with a new diagnosis of DM, head and neck cancer was 47% more likely to occur than in the control population—equating to a rate of 8.1 cases per 10,000 person-years in individuals with DM versus 5.5 cases per 10,000 person-years in patients without DM.1
Kuo-Shu Tseng, PhD, and colleagues at the Tainan University of Technology used an insurance claims database to analyze the records from a total of 89,089 patients with a new diagnosis of DM. Each patient with DM was matched with a patient without a DM-related health claim. In discussing the findings, the study authors concluded, “Because we adequately controlled for the confounding factors, our findings disclose a higher incidence of [head and neck cancer] in patients with DM and highlight the importance of monitoring patients with DM for [head and neck cancer].”
In the population studied, head and neck cancer of the oral cavity was the most likely diagnosis, with an annual incidence of 0.41%, followed by nasopharyngeal cancer (0.11%) and oropharyngeal cancer (0.06%).
Other studies have found similar associations between DM and head and neck cancer. In a 2012 meta-analysis by Stott-Miller et al, investigators pooled data from 12 studies comprising 6448 patients with head and neck cancer and 13,747 control patients.
After adjusting for age, education level, sex, race/ethnicity, study center, cigarette smoking, alcohol use, and body mass index, the relationship between DM and head and neck cancer was not significant (odds ratio [OR], 1.09; 95% CI, 0.95—1.24). However, when analyzing data from patients with DM who had never smoked, investigators identified a significant 59% increase in the risk of developing head and neck cancer (OR, 1.59; 95% CI, 1.22–2.07).2
In a seemingly contradictory finding, a 2010 study by Gaudet et al found that the risk of head and neck cancer appeared to decline as body mass index increased in a multicountry registry study. The Gaudet study included data from 12,716 patients with head and neck cancer and 17,438 control patients. These findings were thought to be a result of weight loss associated with incident cases of head and neck cancer, rather than a true protective effect due to a higher body mass index.3
Considering that two meta-analyses show evidence of a relationship between DM and head and neck cancer, screening patients with DM for symptoms of head and neck cancer may help healthcare professionals detect cases earlier, which may enable more effective treatment.1,2