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Disruption of White Matter Integrity in Adult Survivors of Childhood Brain Tumors: Correlates with Long-Term Intellectual Outcomes.

King TZ, Wang L, Mao H - PLoS ONE (2015)

Bottom Line: The relationships between IQ and FA in the regions where statistically lower FA values were found in survivors were examined, as well as the role of cumulative neurological factors.TBSS identified white matter regions with significantly different mean fractional anisotropy between the three different groups.Lower long-term intellectual outcomes of childhood brain tumor survivors are associated with lower white matter integrity.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology & Neuroscience Institute, Georgia State University, Atlanta, Georgia, United States of America.

ABSTRACT

Background: Although chemotherapy and radiation treatment have contributed to increased survivorship, treatment-induced brain injury has been a concern when examining long-term intellectual outcomes of survivors. Specifically, disruption of brain white matter integrity and its relationship to intellectual outcomes in adult survivors of childhood brain tumors needs to be better understood.

Methods: Fifty-four participants underwent diffusion tensor imaging in addition to structural MRI and an intelligence test (IQ). Voxel-wise group comparisons of fractional anisotropy calculated from DTI data were performed using Tract Based Spatial Statistics (TBSS) on 27 survivors (14 treated with radiation with and without chemotherapy and 13 treated without radiation treatment on average over 13 years since diagnosis) and 27 healthy comparison participants. Whole brain white matter fractional anisotropy (FA) differences were explored between each group. The relationships between IQ and FA in the regions where statistically lower FA values were found in survivors were examined, as well as the role of cumulative neurological factors.

Results: The group of survivors treated with radiation with and without chemotherapy had lower IQ relative to the group of survivors without radiation treatment and the healthy comparison group. TBSS identified white matter regions with significantly different mean fractional anisotropy between the three different groups. A lower level of white matter integrity was found in the radiation with or without chemotherapy treated group compared to the group without radiation treatment and also the healthy control group. The group without radiation treatment had a lower mean FA relative to healthy controls. The white matter disruption of the radiation with or without chemotherapy treated survivors was positively correlated with IQ and cumulative neurological factors.

Conclusions: Lower long-term intellectual outcomes of childhood brain tumor survivors are associated with lower white matter integrity. Radiation and adjunct chemotherapy treatment may play a role in greater white matter disruption. The relationships between white matter integrity and IQ, as well as cumulative neurological risk factors exist in young adult survivors of childhood brain tumors.

No MeSH data available.


Related in: MedlinePlus

White matter differences between survivors treated with radiation therapy with or without chemotherapy and healthy controls.(A) Significant white matter differences between survivors with radiation treatment with or without chemotherapy (RT) and healthy controls (HC) were found in the empirically-identified white matter regions from TBSS. White matter skeleton (color coded in green) is overlaid on a T1 weighted image. Clusters of significantly lower fractional anisotropy (FA) for survivor group are in orange and red. (B) The plot of statistically significant correlations between intellectual performance and the white matter FA measured from the areas of left middle frontal (red) and left middle temporal (blue). LMF = left middle frontal (red), LMT = left middle temporal (blue). VIQ = verbal intelligence quotient, PIQ = performance intelligence quotient. a.u. = arbitrary units.
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pone.0131744.g002: White matter differences between survivors treated with radiation therapy with or without chemotherapy and healthy controls.(A) Significant white matter differences between survivors with radiation treatment with or without chemotherapy (RT) and healthy controls (HC) were found in the empirically-identified white matter regions from TBSS. White matter skeleton (color coded in green) is overlaid on a T1 weighted image. Clusters of significantly lower fractional anisotropy (FA) for survivor group are in orange and red. (B) The plot of statistically significant correlations between intellectual performance and the white matter FA measured from the areas of left middle frontal (red) and left middle temporal (blue). LMF = left middle frontal (red), LMT = left middle temporal (blue). VIQ = verbal intelligence quotient, PIQ = performance intelligence quotient. a.u. = arbitrary units.

Mentions: Most previous studies have examined the difference of white matter between pediatric tumor patients treated with radiation with or without chemotherapy versus clinic-referred controls (e.g., evaluated for headache without identified MRI abnormality)[5, 8, 14, 24]. We extended these earlier findings from childhood brain tumor survivors in their early years to survivors with a mean survival time of 13 years, thus focusing on long term outcomes of young adults. Table 3summarizes the white matter regions that showed lower FA values in survivors with the RT group in comparison to FA values of the HC group. The regions found to have lower FAs in the RT group are shown in Fig 2A. In addition, robust correlations were identified between FA values and VIQ or PIQ in those TBSS empirically-identified regions. The examples of correlations between IQ performance and white matter FA regions are shown in two selected regions (Fig 2B), where positive correlations between FA values of the left middle frontal white matter and VIQ, and FA values of left middle temporal white matter and PIQ in survivors in the RT group are presented.


Disruption of White Matter Integrity in Adult Survivors of Childhood Brain Tumors: Correlates with Long-Term Intellectual Outcomes.

King TZ, Wang L, Mao H - PLoS ONE (2015)

White matter differences between survivors treated with radiation therapy with or without chemotherapy and healthy controls.(A) Significant white matter differences between survivors with radiation treatment with or without chemotherapy (RT) and healthy controls (HC) were found in the empirically-identified white matter regions from TBSS. White matter skeleton (color coded in green) is overlaid on a T1 weighted image. Clusters of significantly lower fractional anisotropy (FA) for survivor group are in orange and red. (B) The plot of statistically significant correlations between intellectual performance and the white matter FA measured from the areas of left middle frontal (red) and left middle temporal (blue). LMF = left middle frontal (red), LMT = left middle temporal (blue). VIQ = verbal intelligence quotient, PIQ = performance intelligence quotient. a.u. = arbitrary units.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4492692&req=5

pone.0131744.g002: White matter differences between survivors treated with radiation therapy with or without chemotherapy and healthy controls.(A) Significant white matter differences between survivors with radiation treatment with or without chemotherapy (RT) and healthy controls (HC) were found in the empirically-identified white matter regions from TBSS. White matter skeleton (color coded in green) is overlaid on a T1 weighted image. Clusters of significantly lower fractional anisotropy (FA) for survivor group are in orange and red. (B) The plot of statistically significant correlations between intellectual performance and the white matter FA measured from the areas of left middle frontal (red) and left middle temporal (blue). LMF = left middle frontal (red), LMT = left middle temporal (blue). VIQ = verbal intelligence quotient, PIQ = performance intelligence quotient. a.u. = arbitrary units.
Mentions: Most previous studies have examined the difference of white matter between pediatric tumor patients treated with radiation with or without chemotherapy versus clinic-referred controls (e.g., evaluated for headache without identified MRI abnormality)[5, 8, 14, 24]. We extended these earlier findings from childhood brain tumor survivors in their early years to survivors with a mean survival time of 13 years, thus focusing on long term outcomes of young adults. Table 3summarizes the white matter regions that showed lower FA values in survivors with the RT group in comparison to FA values of the HC group. The regions found to have lower FAs in the RT group are shown in Fig 2A. In addition, robust correlations were identified between FA values and VIQ or PIQ in those TBSS empirically-identified regions. The examples of correlations between IQ performance and white matter FA regions are shown in two selected regions (Fig 2B), where positive correlations between FA values of the left middle frontal white matter and VIQ, and FA values of left middle temporal white matter and PIQ in survivors in the RT group are presented.

Bottom Line: The relationships between IQ and FA in the regions where statistically lower FA values were found in survivors were examined, as well as the role of cumulative neurological factors.TBSS identified white matter regions with significantly different mean fractional anisotropy between the three different groups.Lower long-term intellectual outcomes of childhood brain tumor survivors are associated with lower white matter integrity.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology & Neuroscience Institute, Georgia State University, Atlanta, Georgia, United States of America.

ABSTRACT

Background: Although chemotherapy and radiation treatment have contributed to increased survivorship, treatment-induced brain injury has been a concern when examining long-term intellectual outcomes of survivors. Specifically, disruption of brain white matter integrity and its relationship to intellectual outcomes in adult survivors of childhood brain tumors needs to be better understood.

Methods: Fifty-four participants underwent diffusion tensor imaging in addition to structural MRI and an intelligence test (IQ). Voxel-wise group comparisons of fractional anisotropy calculated from DTI data were performed using Tract Based Spatial Statistics (TBSS) on 27 survivors (14 treated with radiation with and without chemotherapy and 13 treated without radiation treatment on average over 13 years since diagnosis) and 27 healthy comparison participants. Whole brain white matter fractional anisotropy (FA) differences were explored between each group. The relationships between IQ and FA in the regions where statistically lower FA values were found in survivors were examined, as well as the role of cumulative neurological factors.

Results: The group of survivors treated with radiation with and without chemotherapy had lower IQ relative to the group of survivors without radiation treatment and the healthy comparison group. TBSS identified white matter regions with significantly different mean fractional anisotropy between the three different groups. A lower level of white matter integrity was found in the radiation with or without chemotherapy treated group compared to the group without radiation treatment and also the healthy control group. The group without radiation treatment had a lower mean FA relative to healthy controls. The white matter disruption of the radiation with or without chemotherapy treated survivors was positively correlated with IQ and cumulative neurological factors.

Conclusions: Lower long-term intellectual outcomes of childhood brain tumor survivors are associated with lower white matter integrity. Radiation and adjunct chemotherapy treatment may play a role in greater white matter disruption. The relationships between white matter integrity and IQ, as well as cumulative neurological risk factors exist in young adult survivors of childhood brain tumors.

No MeSH data available.


Related in: MedlinePlus