title: Evaluation of resting state networks in patients with gliomas: connectivity changes in the unaffected side and its relation to cognitive function.
abstract: In this study, we investigated changes in resting state networks (RSNs) in patients with gliomas located in the left hemisphere and its relation to cognitive function. We hypothesized that long distance connection, especially between hemispheres, would be affected by the presence of the tumor. We further hypothesized that these changes would correlate with, or reflect cognitive changes observed in patients with gliomas. Resting state functional MRI datasets from 12 patients and 12 healthy controls were used in the analysis. The tumor's effect on three well-known RSNs including the default mode network (DMN), executive control network (ECN), and salience network (SN) identified using independent component analysis were investigated using dual regression analysis. Scores of neuropsychometric testing (WAIS-III and WMS-R) were also compared. Compared to the healthy control group, the patient group showed significant decrease in functional connectivity in the right angular gyrus/inferior parietal lobe of the ventral DMN and in the dorsolateral prefrontal cortex of the left ECN, whereas a significant increase in connectivity in the right ECN was observed in the right parietal lobe. Changes in connectivity in the right ECN correlated with spatial memory, while that on the left ECN correlated with attention. Connectivity changes in the ventral DMN correlated with attention, working memory, full IQ, and verbal IQ measures. Although the tumors were localized in the left side of the brain, changes in connectivity were observed in the contralateral side. Moreover, these changes correlated with some aspects of cognitive function indicating that patients with gliomas may undergo cognitive changes even in the absence of or before the onset of major symptoms. Evaluation of resting state networks could be helpful in advancing our hodological understanding of brain function in glioma cases.
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan; Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Satoshi
authors: S
authors: Maesawa
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan.
authors: Epifanio
authors: E
authors: Bagarinao
authors: Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Masazumi
authors: M
authors: Fujii
authors: Department of Rehabilitation, Nagoya Hospital Organization, Nagoya Medical Center, Nagoya City, Aichi, Japan.
authors: Miyako
authors: M
authors: Futamura
authors: Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Kazuya
authors: K
authors: Motomura
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan; Department Neurology, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Hirohisa
authors: H
authors: Watanabe
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan.
authors: Daisuke
authors: D
authors: Mori
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan; Department Neurology, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Gen
authors: G
authors: Sobue
authors: Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan; Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan.
authors: Toshihiko
authors: T
authors: Wakabayashi
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D003071:Cognition; D063132:Connectome; D005260:Female; D005910:Glioma / Q000473:pathology / Q000503:physiopathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D060787:Neoplasm Grading; D009483:Neuropsychological Tests; D012146:Rest; D047368:Tumor Burden