Abstract
Purpose
To investigate the combined use of blood-based 3-protein signature and breast ultrasound (US) for validating US-detected lesions.
Methods
From July 2011 to April 2020, women who underwent whole-breast US within at least 6 months from sampling period were retrospectively included. Blood-based 3-protein signature (Mastocheck®) value and US findings were evaluated. Following outcome measures were compared between US alone and the combination of Mastocheck® value with US: sensitivity, specificity, positive predictive value (PPV), negative predictive value, area under the receiver operating characteristic curve (AUC), and biopsy rate.
Results
Among the 237 women included, 59 (24.9%) were healthy individuals and 178 (75.1%) cancer patients. Mean size of cancers was 1.2 ± 0.8 cm. Median value of Mastocheck® was significantly different between nonmalignant (− 0.24, interquartile range [IQR] − 0.48, − 0.03) and malignant lesions (0.55, IQR − 0.03, 1.42) (P < .001). Utilizing Mastocheck® value with US increased the AUC from 0.67 (95% confidence interval [CI] 0.61, 0.73) to 0.81 (95% CI 0.75, 0.88; P < .001), and specificity from 35.6 (95% CI 23.4, 47.8) to 64.4% (95% CI 52.2, 76.6; P < .001) without loss in sensitivity. PPV was increased from 82.2 (95% CI 77.1, 87.3) to 89.3% (95% CI 85.0, 93.6; P < .001), and biopsy rate was significantly decreased from 79.3 (188/237) to 72.1% (171/237) (P < .001). Consistent improvements in specificity, PPV, and AUC were observed in asymptomatic women, in women with dense breast, and in those with normal/benign mammographic findings.
Conclusion
Mastocheck® is an effective tool that can be used with US to improve diagnostic specificity and reduce false-positive findings and unnecessary biopsies.
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Acknowledgements
We thank Hwa Jung Kim, MD, PhD, associate professor of preventive medicine, for helping us with the statistical analysis.
Funding
This study was supported by Seoul National University Hospital Research Fund (Grant No. 04-2021-0510).
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Hong-Kyu Kim and Yumi Kim have unlisted stocks of Berits Inc. Dong-Young Noh report conflict of interest as he became CEO of Berits Inc. since March 2021. Wonshik Han reports being a member on the board of directors of and holding stock and ownership interests at DCGen, Co., Ltd., not relevant to this study. Su Min Ha and Jung Min Chang have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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10549_2022_6527_MOESM1_ESM.jpg
Supplementary Fig. 1: Receiver Operating Characteristic curve for Mastocheck®, breast ultrasound, and Mastocheck® combined with breast ultrasound in 63 women with negative/benign mammography. The AUC of breast US (solid line) is 0.70 (95% confidence interval [CI]: 0.62, 0.77) and Mastocheck® (dashed line) is 0.67 (95% CI: 0.54, 0.81). AUC is increased to 0.84 (95% CI: 0.77, 0.91) (P < .001) by addition of Mastocheck® to breast ultrasound (dot-dashed line). (JPG 2309 KB)
10549_2022_6527_MOESM2_ESM.jpg
Supplementary Fig. 2: Receiver Operating Characteristic curve for Mastocheck®, breast ultrasound, and Mastocheck® combined with breast ultrasound in 135 asymptomatic women. The AUC of breast ultrasound (solid line) is 0.66 (95% confidence interval [CI]: 0.60, 0.73) and Mastocheck® (dashed line) is 0.75 (95% CI: 0.68, 0.82). AUC is increased to 0.81 (95% CI: 0.74, 0.88) (P <. 001) by addition of Mastocheck® to breast ultrasound (dot-dashed line). (JPG 2331 KB)
10549_2022_6527_MOESM3_ESM.jpg
Supplementary Fig. 3: Receiver Operating Characteristic curve for Mastocheck®, breast ultrasound, and Mastocheck® combined with breast ultrasound in 57 asymptomatic women with negative/benign mammography. The AUC of breast ultrasound (solid line) is 0.70 (95% confidence interval [CI]: 0.63, 0.78) and Mastocheck® (dashed line) is 0.70 (95% CI: 0.56, 0.85). AUC is increased to 0.85 (95% CI: 0.77, 0.92) (P < .001) by addition of Mastocheck® to breast ultrasound (dot-dashed line). (JPG 2332 KB)
Appendices
Appendix
Material and methods
Preparation of blood samples
Plasma samples were drawn from peripheral veins and were stored in tubes containing ethylene diaminetetra-acetic acid (EDTA) to prevent coagulation. Samples were transferred to the laboratory and underwent centrifugation at 1300×g for 10 min at 4 °C. The supernatant plasma was filtered through a cellulose acetate filter (0.2 μm pore site) and platelet-free plasma was stored at − 80 °C. For mass spectrometry (MS), plasma protein concentration was determined by the Bradford assay. The plasma protein samples were denatured by incubation in 50 mM Tris buffer (pH 8.0) containing 3 M urea at 37 °C for 30 min. Samples were reduced with 10 mM dithiothreitol for 1 h at 56 °C, treated with 60 mM iodoacetamide for 1 h at room temperature in the dark, and then diluted tenfold with 50 mM ammonium bicarbonate. Digestion was performed with sequencing-grade trypsin (Promega, Madison, WI, USA) at 37 °C overnight at protein: trypsin molar ratio of 50:1. Tryptic digests were desalted using a C18 SPE cartridge (Waters, Milford, MA, USA) and dried in vacuo. The dried samples were dissolved in 0.1% formic acid. One hundred femtomoles of a betagalactosidase (β-Gal) peptide (residues 954–962, GDFQFNISR) was added to the desalted peptide mixture.
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Ha, S.M., Kim, HK., Kim, Y. et al. Diagnostic performance improvement with combined use of proteomics biomarker assay and breast ultrasound. Breast Cancer Res Treat 192, 541–552 (2022). https://doi.org/10.1007/s10549-022-06527-1
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DOI: https://doi.org/10.1007/s10549-022-06527-1