Language:
English
In:
Cancer research (Chicago, Ill.), 2018-02-01, Vol.78 (3), p.610-616
Description:
Brain metastases are common and are usually detected by MRI. Diffusion tensor imaging (DTI) is a derivative MRI technique that can detect disruption of white matter tracts in the brain. We have matched preoperative DTI with image-guided sampling of the brain-tumor interface in 26 patients during resection of a brain metastasis and assessed mean diffusivity and fractional anisotropy (FA). The tissue samples were analyzed for vascularity, inflammatory cell infiltration, growth pattern, and tumor expression of proteins associated with growth or local invasion such as Ki67, S100A4, and MMP2, 9, and 13. A lower FA in the peritumoral region indicated more white matter tract disruption and independently predicted longer overall survival times (HR for death = 0.21; 95% confidence interval, 0.06-0.82;
= 0.024). Of all the biological markers studied, only increased density of CD3
lymphocytes in the same region correlated with decreased FA (Mann-Whitney
= 0.037) as well as confounding completely the effect of FA on multivariate survival analyses. We conclude that the T-cell response to brain metastases is not a surrogate of local tumor invasion, primary cancer type, or aggressive phenotype and is associated with patient survival time regardless of these biological factors. Furthermore, it can be assayed by DTI, potentially offering a quick, noninvasive, clinically available method to detect an active immune microenvironment and, in principle, to measure susceptibility to immunotherapy.
These findings show that white matter tract integrity is degraded in areas where T-cell infiltration is highest, providing a noninvasive method to identify immunologically active microenvironments in secondary brain tumors.
.
Subject(s):
Adult ; Aged ; Biomarkers ; Brain cancer ; Brain Neoplasms - mortality ; Brain Neoplasms - secondary ; Brain Neoplasms - surgery ; Brain tumors ; Cancer ; CD3 antigen ; Cell survival ; Confidence intervals ; Diffusion ; Diffusion Magnetic Resonance Imaging - methods ; Female ; Follow-Up Studies ; Gelatinase A ; Humans ; Immunotherapy ; Infiltration ; Inflammation ; Integrity ; Lymphocytes ; Lymphocytes T ; Magnetic resonance imaging ; Male ; Metastases ; Metastasis ; Microenvironments ; Middle Aged ; Neoplasms - mortality ; Neoplasms - pathology ; Neoplasms - surgery ; Neuroimaging ; Phenotypes ; Prognosis ; Prospective Studies ; Proteins ; S100A4 protein ; Substantia alba ; Survival ; Survival Rate ; T-Lymphocytes - pathology ; Tumors ; Young Adult
ISSN:
0008-5472
E-ISSN:
1538-7445
DOI:
10.1158/0008-5472.CAN-17-1720
Source:
HighWire Press (Free Journals)
Source:
Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
URL:
https://www.ncbi.nlm.nih.gov/pubmed/29212855$$D View this record in MEDLINE/PubMed
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