Abstract
Purpose
Apolipoprotein M (APOM) is a plasma apolipoprotein closely involved with lipid metabolism and inflammation. In vitro studies suggest that APOM may also have a tumor-suppressive role in breast cancer. In the present study, we aimed to evaluate the impact of plasma APOM levels on the prognosis of breast cancer patients.
Methods
We measured APOM levels using an enzyme-linked immunosorbent assay in 75 patients with ER-positive/HER2-negative metastatic breast cancer. The endpoint was overall survival (OS) at 24 months.
Results
During the 24-month follow-up period, 34.7% of the patients died. Baseline APOM levels were significantly reduced in patients who deceased during follow-up compared to survivors (42.7 ± 14.5 µg/mL versus 52.2 ± 13.8 µg/mL; P = 0.003). Cox regression analysis showed a hazard ratio of 0.30 [95% confidence interval 0.15–0.61]; P < 0.001 per doubling of APOM levels. Correction for age, C-reactive protein, menopausal state, histology of the primary tumor, metastatic site, number of metastases, endocrine resistance, scheduled therapy line, and kind of scheduled therapy indicated that circulating APOM predicted OS independently of these parameters (HRper doubling = 0.23 [0.09–0.56; P = 0.001).
Conclusions
Our study suggests that circulating APOM is significantly linked with reduced mortality in metastatic breast cancer patients.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Funding
This present study was partly financed by the European Regional Development Fund through the INTERREG V program ‘Alpenrhein-Bodensee-Hochrein,’ project number: ABH055.
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All authors contributed to the study conception and design. Conception and design of the study were performed by TD and AM. Patients’ recruitment, sample, and data collection were carried out by TD, TD, KG, and SG. Material preparation, sample analysis, and data analysis were performed by CH, EMB, HD, and AL. The first draft of the manuscript was written by AM and all authors commented on the previous versions of the manuscript. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the State Chamber of Medicine of Baden-Württemberg (F-2017-046).
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Muendlein, A., Heinzle, C., Brandtner, E.M. et al. Plasma apolipoprotein M predicts overall survival in metastatic breast cancer patients. Breast Cancer Res Treat 201, 571–576 (2023). https://doi.org/10.1007/s10549-023-07045-4
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DOI: https://doi.org/10.1007/s10549-023-07045-4