Abstract
Purpose
Breast cancer (BC) patients who achieve a favorable residual cancer burden (RCB) after neoadjuvant chemotherapy (NACT) have an improved recurrence-free survival. Those who have an unfavorable RCB will have gone through months of ineffective chemotherapy. No ideal method exists to predict a favorable RCB early during NACT. Diffuse optical tomography (DOT) is a novel imaging modality that uses near-infrared light to assess hemoglobin concentrations within breast tumors. We hypothesized that the 2-week percent change in DOT-measured hemoglobin concentrations would associate with RCB.
Methods
We conducted an observational study of 40 women with stage II–IIIC BC who received standard NACT. DOT imaging was performed at baseline and 2 weeks after treatment initiation. We evaluated the associations between the RCB index (continuous measure), class (categorical 0, I, II, III), and response (RCB class 0/I = favorable, RCB class II/III = unfavorable) with changes in DOT-measured hemoglobin concentrations.
Results
The RCB index correlated significantly with the 2-week percent change in oxyhemoglobin [HbO2] (r = 0.5, p = 0.003), deoxyhemoglobin [Hb] (r = 0.37, p = 0.03), and total hemoglobin concentrations [HbT] (r = 0.5, p = 0.003). The RCB class and response significantly associated with the 2-week percent change in [HbO2] (p ≤ 0.01) and [HbT] (p ≤ 0.02). [HbT] 2-week percent change had sensitivity, specificity, positive, and negative predictive values for a favorable RCB response of 86.7, 68.4, 68.4, and 86.7%, respectively.
Conclusion
The 2-week percent change in DOT-measured hemoglobin concentrations was associated with the RCB index, class, and response. DOT may help guide NACT for women with BC.
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Abbreviations
- A:
-
Doxorubicin
- BC:
-
Breast cancer
- BMI:
-
Body mass index
- C:
-
Cyclophosphamide
- CT:
-
Computerized tomography
- DOT:
-
Diffuse optical tomography
- [Hb]:
-
Deoxyhemoglobin concentration
- [HbO2]:
-
Oxyhemoglobin concentration
- [HbT]:
-
Total hemoglobin concentration
- HER2:
-
Human epidermal growth factor receptor 2
- HR:
-
Hormone receptor
- MRI:
-
Magnetic resonance imaging
- NACT:
-
Neoadjuvant chemotherapy
- nm:
-
Nanometer
- NPV:
-
Negative predictive value
- pCR:
-
Pathologic complete response
- PET:
-
Position emission tomography
- PPV:
-
Positive predictive value
- RCB:
-
Residual cancer burden
- ROI:
-
Region of interest
- SD:
-
Standard deviation
- T:
-
Paclitaxel
- US:
-
Ultrasound
- WF:
-
Water fraction
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Funding
This study was funded by Grants from the Komen Foundation for the Cure Post Doctoral Fellowship Research Grant to EAL, National Science Foundation Integrative Graduate Education and Research Traineeship program on Optical Techniques for Actuation, Sensing, and Imaging of Biological Systems at Columbia University to JEG, and the Natural Sciences and Engineering Research Council of Canada (NSERC) to MF. This publication was also supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through Grant No. KL2 TR000081 to KK. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This research was also supported in part by the Witten Family Fund.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Emerson A. Lim, Jacqueline E. Gunther, Andreas Hielscher and Dawn L. Hershman have contributed equally to this work.
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Lim, E.A., Gunther, J.E., Kim, H.K. et al. Diffuse optical tomography changes correlate with residual cancer burden after neoadjuvant chemotherapy in breast cancer patients. Breast Cancer Res Treat 162, 533–540 (2017). https://doi.org/10.1007/s10549-017-4150-7
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DOI: https://doi.org/10.1007/s10549-017-4150-7