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7T CEST MRI: A potential imaging tool for the assessment of tumor grade and cell proliferation in breast cancer.

Abstract：

OBJECTIVES:To investigate the feasibility of chemical exchange saturation transfer (CEST) MRI in patients with breast carcinomas and possible correlations between magnetization transfer asymmetry (MTRasym) values and histological features, such as tumor grade and the Ki-67 proliferation index. MATERIALS AND METHODS:Nine healthy subjects and 18 female patients were enrolled for this study. The imaging protocol for the patients consisted of diffusion-weighted imaging (DWI), CEST imaging, and T1-weighted, contrast-enhanced (CE)-MRI. CEST was performed using a 3D gradient echo (GRE) sequence, employing eight pre-saturation pulses of a duration of 50 ms and a duty cycle (DC) of 80%, with a mean amplitude of the saturation pulse train of 1 μT. The Z-spectrum was plotted and MTRasym values calculated for the frequency of the maximum of MTRasym curve, were correlated with the Ki-67 proliferation index and apparent diffusion coefficient (ADC). Patient data were statistically assessed using the Games-Howell post-hoc and Pearson's correlation test. RESULTS:Different tumor types had asymmetry peaks at different positions of Z-spectrum. MTRasym (mean ± SD) (%) calculated for G1 (3.0 ± 0.3; range: 2.70-3.50) was not significantly lower than for G2 (4.50 ± 1.30; range: 3.20-6.50; p = 0.066). In contrast, the increase in MTRasym between G1 and G3 (6.40 ± 1.70; range: 4.80-9.80) lesions was significant (p = 0.007). No significant difference was observed between G2 and G3 with regard to MTRasym (p = 0.089). There was a strong positive correlation between the MTRasym, and Ki-67 proliferation index (r = 0.890; p = 0.001), while there was a moderate negative correlation between MTRasym and ADC values (r = -0.506; p = 0.027). CONCLUSIONS:Calculated MTRasym demonstrates a strong positive correlation with tumor proliferation and has the potential to become a valuable biomarker for breast tumor characterization.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Zaric O,Farr A,Poblador Rodriguez E,Mlynarik V,Bogner W,Gruber S,Asseryanis E,Singer CF,Trattnig S

doi

10.1016/j.mri.2019.03.004

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

77-87

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(19)30086-4

journal_volume

pub_type

杂志文章

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7T CEST MRI: A potential imaging tool for the assessment of tumor grade and cell proliferation in breast cancer.