Up to 70 percent of cancer patients experience cognitive impairment, including diminished memory, reasoning, and multitasking ability . The condition is commonly called “chemo brain” or “chemo fog”, even though chemotherapy is unlikely the sole cause of these cognitive problems. The duration of chemo brain can vary from a few weeks to several years .
Does having chemo brain increase your risk of developing Alzheimer’s disease? The evidence is mixed. One study of twins found that cancer survivors were more likely than their twins without cancer to have cognitive dysfunction . A study of breast cancer patients reported that in the long-run, dementia diagnoses were more common in women who had chemotherapy treatment than those who had not . But, another study showed an association between a history of cancer and a reduced risk of Alzheimer’s disease . And many other studies show no significant associations between a history of cancer and dementia risk [7-9]. There are many factors to consider in these studies, such as the kind of cancer, types of treatment, the dose and length of treatment, preexisting cognitive status, and survival rate of cancer patients. The adverse biological effects of cancer itself can also play a role in Alzheimer’s risk.
More studies are needed to determine the long-term relationships among cancer, cancer treatments, and cognitive dysfunction. Clinical trials are underway to test whether docosahexaenoic acid (DHA)  or nicotine patches  may prevent or reduce cognitive dysfunction in patients receiving chemotherapy. People experiencing chemo brain should notify their doctor and monitor their symptoms, as the impacts vary widely by person and by treatment. Some strategies to manage chemo brain include getting enough rest, exercising regularly, and using a daily planner or smart phone to keep track of your schedule. These recommendations and other information regarding chemo brain can be found at the American Cancer Society.
Yuko Hara, PhD, is Director of Aging and Alzheimer's Prevention at the Alzheimer's Drug Discovery Foundation. Dr. Hara was previously an Assistant Professor in Neuroscience at the Icahn School of Medicine at Mount Sinai, where she remains an adjunct faculty member. Her research focused on brain aging, specifically how estrogens and reproductive aging influence the aging brain's synapses and mitochondria. She earned a doctorate in neurology and neuroscience at Weill Graduate School of Medical Sciences of Cornell University and a bachelor's degree in biology from Cornell University, with additional study at Keio University in Japan. Dr. Hara has authored numerous peer-reviewed publications, including articles in PNAS and Journal of Neuroscience.
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