Deconstructing chemobrain: What's new in cancer and cognition
PUBLISHED TUESDAY, DECEMBER 3, 2013
November was an exciting month for nurses conducting research in the area of cognitive changes related to cancer and cancer treatment.
Many of us were fortunate to attend the Oncology Nursing Society Connections conference in Dallas, where we had the opportunity to share research results and discuss future research projects dedicated to learning more about the cognitive changes that some cancer survivors experience. Additionally, the November issue of the Seminars in Oncology Nursing journal was devoted to "Cognitive Changes Associated with Cancer and Cancer Treatment."
"Chemobrain" and cognitive changes due to cancer and other related treatments pose a challenge to many survivors of cancer. Incidence estimates for cancer-related cognitive changes range from 75 to 90 percent of survivors at some point prior to, during or following treatment.
Around 25 percent of survivors struggle with long-term cognitive effects. Survivors describe the experience of these cognitive changes to include issues such as difficulty with word finding, misplacing things such as keys and cell phones, forgetting why they walked into a room, missing appointments and trouble multitasking. Results from neuro-psychologic tests have shown decreases in processing speed, memory and executive function (the ability to plan out and complete the steps necessary to accomplish a goal). All of these issues cause frustration and can decrease survivors' quality of life.
A great deal of research is being conducted to better understand the causes of these cognitive changes so that preventive strategies and interventions can be developed. Many different theories are being explored such as injury to neural progenitor cells (stem cells that give rise to mature brain cells), changes to DNA-repair genes, accelerated aging of the brain, and genetic pre-disposal to central nervous system injury. Results of studies that include the use of functional magnetic resonance imaging (MRI) and memory testing are demonstrating changes in brain volume and activation.
Additionally, exciting research is being conducted to explore interventions to reduce cognitive injury and/or improve cognitive function. Some interesting results are being seen in the areas of cognitive behavioral training and exercise.
Cognitive Behavioral Training includes exercises to assist with memory and processing speed as well as recommendations for strategies to accommodate for changes in cognitive function. Exercise studies to date have included yoga, Tai Chi, Qigong, aerobic exercise and resistance training. More research needs to be conducted to support the widespread use of these interventions, but these early results are encouraging. Additional results will be presented at the upcoming 2014 International Cancer and Cognition Task Force (ICCTF) Cancer and Cognition Conference to be held in Seattle next February. The Task Force is comprised of oncologists, radiologists, nurses, basic scientists and other disciplines all dedicated to finding solutions to the problem of cancer-related cognitive changes.