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With increased age comes the increased risk to develop cancer or dementia. Both conditions share similar risk factors such as hypertension and diabetes. Many cancer patients experience cognitive impairment from cancer and its treatments with symptoms similar to dementia.
But are these only similarities, or does a cancer diagnosis predispose patients to developing dementia? Prior literature indicates a lower risk of dementia after a cancer diagnosis and vice versa. However, studies of the long-term effects are lacking.
As part of her dissertation at the University of Alabama at Birmingham School of Public Health, tadalafil active ingredient Mackenzie Fowler, Ph.D., conducted a retrospective study to evaluate the long-term relationship between the two conditions. Results published in the Journal of Alzheimer’s Disease showed dementia patients with cancer history demonstrated better cognition at dementia diagnosis and declined slower than dementia patients without cancer history.
“Our findings indicate that, even in the long run, only around 20% of cancer patients develop dementia after their cancer diagnosis, and those who do seem to experience better cognition at diagnosis and over time than those without a prior cancer diagnosis,” said Fowler, now a postdoctoral scholar trainee in the UAB Division of Hematology and Oncology in the Marnix E. Heersink School of Medicine. “This inverse relationship between cancer and dementia confirms similar results in the medical literature while also providing long-term evidence.”
Overall, patients with one cancer diagnosis had an approximately 1.1-point higher cognitive baseline score and cognitive decline and seemed to progress slightly slower than non-cancer patients. However, patients who had two or more cancer diagnoses saw an approximately 1.5-point lower cognitive score than those without a prior cancer diagnosis.
Fowler used data going back to 2003 from UAB to identify dementia patients with and without prior cancer diagnoses. She then evaluated recorded cognitive scores of the patients over five years from 2014–2020. Having a clinical patient population also allowed for observation of diversity within the population over an extended period. Rates of cognitive decline between race and ethnicity groups differed. Regardless of cancer status, underrepresented race and ethnicity groups did not perform as well as non-Hispanic white patients.
“The next step is to ask why there is this overall inverse relationship and why two or more cancers seems to alter this relationship,” Fowler said. “Could it be because early signs of cognitive decline were captured earlier due to a cancer patient’s receiving frequent medical attention? Is it something that is more biologically driven? What about race, socioeconomic status or other social determinants of health? There are many questions to be answered by future studies.”
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