Journal
BRAIN IMAGING AND BEHAVIOR
Volume 14, Issue 3, Pages 847-856Publisher
SPRINGER
DOI: 10.1007/s11682-018-0030-y
Keywords
Lung cancer; Functional connectivity; Cognitive impairment; Default mode network; Resting-state fMRI
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Funding
- National Natural Science Foundation of China [81601477] Funding Source: Medline
- Nanjing Outstanding Youth Fund [JQX17006] Funding Source: Medline
- Six Talent Peaks Project in Jiangsu Province [YY-079] Funding Source: Medline
- Jiangsu Provincial Special Program of Medical Science [BE2017614] Funding Source: Medline
- Youth Medical Talents of Jiangsu Province [QNRC2016062] Funding Source: Medline
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Previous studies have demonstrated that cognitive impairment is associated with neurophysiological changes in lung cancer following chemotherapy. This study aimed to investigate the intrinsic functional connectivity (FC) pattern within the default mode network (DMN) and its associations with cognitive impairment in patients with lung cancer revealed by resting-state functional magnetic resonance imaging (fMRI). Resting-state fMRI scans were acquired from 21 post-chemotherapy and 27 non-chemotherapy lung cancer patients and 30 healthy controls. All groups were age, gender and education-matched. The posterior cingulate cortex (PCC) was chosen as the seed region to detect the FC patterns and then determine whether these changes were related with specific cognitive performance. Compared with non-chemotherapy lung cancer patients, chemotherapy patients revealed decreased FC between the PCC and the right anterior cingulate cortex (ACC), left inferior parietal lobule (IPL), and left medial prefrontal cortex (mPFC), as well as increased FC with the left postcentral gyrus (PoCG). Relative to healthy controls, post-chemotherapy patients exhibited reduced FC between the PCC and the left ACC and left temporal lobe, as well as increased FC with the right PoCG. Moreover, the decreased FC of the PCC to bilateral ACC in post-chemotherapy patients was positively associated with reduced MoCA scores (left: r = 0.529, p = 0.029; right: r = 0.577, p = 0.015). The current study mainly demonstrated reduced resting-state FC pattern within the DMN regions that was linked with impaired cognitive function in lung cancer patients after chemotherapy. These findings illustrated the potential role of the DMN in lung cancer patients that will provide novel insight into the underlying neuropathological mechanisms in chemotherapy-induced cognitive impairment.
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