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Int J Radiat Oncol Biol Phys. 2019 Aug 1;104(5):1074-1083. doi: 10.1016/j.ijrobp.2019.04.002. Epub 2019 Apr 13.

Lipopolysaccharide-Binding Protein Is an Early Biomarker of Cardiac Function After Radiation Therapy for Breast Cancer.

Author information

1
Department of Radiation Oncology, Military Institute of Medicine, Warsaw, Poland.
2
Radomian Oncology Center, Radom, Poland.
3
Department of Cardiology, N. Copernicus Provincial Multidisciplinary Centre of Oncology and Traumatology, Lodz, Poland; Institute of Health Science, University of Social Science, Lodz, Poland.
4
Department of Pediatrics, Oncology, Hematology and Diabetology, Medical University of Lodz, Poland.
5
Department of Biostatistics and Translational Medicine, Medical University of Lodz, Poland.
6
Department of Biostatistics and Translational Medicine, Medical University of Lodz, Poland; Department of Radiotherapy, Medical University of Lodz, Poland; Postgraduate School of Molecular Medicine, Medical University of Warsaw, Poland.
7
Department of Radiotherapy, Medical University of Lodz, Poland.
8
Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
9
Department of Biostatistics and Translational Medicine, Medical University of Lodz, Poland; Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts. Electronic address: wojciech_fendler@dfci.harvard.edu.

Abstract

PURPOSE:

To evaluate the prognostic potential of lipopolysaccharide-binding protein (LBP) levels after breast cancer radiation therapy (RT) for incipient cardiac dysfunction.

METHODS AND MATERIALS:

In this single-centered study, we prospectively enrolled female patients treated for left breast cancer. Healthy age- and sex-matched participants were recruited as controls. LBP levels, cardiac troponin T, N-terminal propeptide of the brain natriuretic peptide, fatty acid binding protein, and C-reactive protein were assessed at three timepoints-before RT, after the last RT fraction, and 1 month after the last fraction. Echocardiographic evaluation was done 3 to 3.75 years after RT.

RESULTS:

We recruited 51 patients and 78 controls. Baseline LBP concentrations in the study group were significantly higher than in controls at baseline (P < .001), at 24 hours, and at 1 month after RT (P = .003 and P < .001, respectively). Other biomarkers (cardiac troponin T, N-terminal propeptide of the brain natriuretic peptide, fatty acid binding protein, and C-reactive protein) did not differ in any of the timepoints. Posttreatment LBP concentrations were significantly and positively correlated with heart- and lung-associated dose-volume histogram variables. Posttreatment and follow-up LBP levels correlated positively with the E/E' echocardiographic index reflective of the diastolic function. After adjustment for left anterior descending artery mean dose, left ventricle mean dose, mean heart dose, and type of surgery, LBP remained significantly correlated with E/E' when measured 24 hours after RT (beta = 0.41, P = .032) and 1 month after RT (beta = 0.43, P = .028).

CONCLUSIONS:

Serum LBP concentrations correlate with diastolic function evaluated 3 years after the completion of RT, making LBP a potentially useful prognostic parameter.

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