Cancer survivors have long complained of cognitive decline following chemotherapy. This effect has been studied in some depth, but, for the first time, researchers ask how long these deficits might last.
Chemotherapy is known to interfere with cognitive abilities, but for how long?
As treatments for cancer improve, survival rates increase, as do the number of cancer survivors.
This growing population of people who have come through cancer and lived to tell the tale often report cognitive deficits.
Chemo brain, or chemo fog, as it has been dubbed, was first reported by breast cancer survivors.
It affects memory, concentration, and an individual’s ability to multitask, among other reductions in function.
Some women with chemo brain report that their ability to follow conversations is impaired and that they are more easily fatigued and confused.
A review that looked at the prevalence of chemo brain estimated that it affects 17-50 percent of female breast cancer survivors.
Although research has established chemo brain as a genuine consequence of chemotherapy, there are still many questions that need to be answered. One such question asks how long chemo brain is likely to last.
Measuring the length of chemo brain
A study, conducted at the University of Illinois and published in the journal Behavioural Brain Research, set out to investigate the effects of chemo brain over a longer period of time. For this purpose, the team designed a mouse model that will help researchers of the future investigate this problem and, potentially, rectify it.
The study’s lead author, Catarina Rendeiro, worked with a group of researchers across the university, including Justin Rhodes, a psychology professor, and William Helferich, a professor of nutrition.
“Quality of life after chemotherapy is critically important, and chemo brain is significant in these survivors.”
Earlier research has shown that the intense physical toll of chemotherapy accounts for the short-term deficits in cognitive ability seen in chemo brain. As Prof. Rhodes says: “The question is, after they completely recover from the acute assault of chemotherapy, many months or years later, do they still have cognitive impairments?”
The researchers used a female mouse model designed to mimic post-menopausal women as closely as possible. To measure the potential long-term effects of chemo brain, they measured how chemotherapy impacted learning and memory. Additionally, they charted the formation of new neurons in the hippocampus – a part of the brain important in memory, among other roles.
The mice were put through their paces using a Morris Water Maze. This type of trial has been widely used in behavioral neuroscience to study memory and spatial learning since the early 1980s. It involves placing a mouse in a circular pool and timing it while they search for a submerged platform.
Source: Medical news today