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Updated: Jun 20, 2026
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Longitudinal Morphological and Physiological Monitoring of Three-dimensional Tumor Spheroids Using Optical Coherence Tomography
Published on: February 9, 2019
Using optical spectroscopy to longitudinally monitor physiological changes within solid tumors
Karthik Vishwanath1, Hong Yuan, William T Barry
1Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA. kvh1@duke.edu
Neoplasia (New York, N.Y.)
|September 3, 2009
Summary
Quantitative diffuse reflectance spectroscopy non-invasively monitored cancer therapy response in mice. Optical methods identified physiological changes, accelerating new drug development by pinpointing key time points for further analysis.
Area of Science:
- Biomedical Optics
- Preclinical Cancer Research
- Translational Medicine
Background:
- Monitoring cancer therapy response is crucial for drug development.
- Existing methods for longitudinal monitoring can be invasive or time-consuming.
- Optical spectroscopy offers a potential non-invasive alternative.
Purpose of the Study:
- To evaluate quantitative diffuse reflectance spectroscopy for monitoring physiological response to cancer therapy.
- To assess the feasibility of this technique in a preclinical tumor model.
- To correlate optical measurements with established endpoints.
Main Methods:
- Diffuse reflectance spectroscopy was used to collect spectral data from 4T1 flank tumors in nude mice over two weeks.
- An inverse scalable Monte Carlo model quantified hemoglobin concentrations and scattering coefficients.
- Doxorubicin (DOX) was administered to one group of mice to assess treatment response.
Main Results:
- Tumor growth rates and scattering parameters were similar between treated and control groups.
- Doxorubicin-treated tumors showed a significant, transient increase in blood oxygen saturation.
- Optical measurements of deoxygenated hemoglobin and scattering correlated with hypoxic and necrotic fractions, respectively.
Conclusions:
- Quantitative diffuse reflectance spectroscopy can longitudinally monitor physiological responses to cancer therapy in preclinical models.
- Optical methods can serve as a screening technology to accelerate anticancer drug development.
- This technique can identify optimal time points for more intensive analyses like imaging or immunohistochemistry.
