Purpose: The purpose of this study is to evaluate in vivo the diagnostic relevance of ultrasound-derived metrics for stiffness, elasticity, viscosity, and anisotropy. Participants: Forty women with breast lesions that have a BIRADS-4 or BIRADS-5 rating and forty women undergoing neoadjuvant chemotherapy (NAC) for malignant breast lesions will be recruited. Subjects will be recruited from the Breast Imaging Division of UNC Hospitals. Procedures (methods): In this exploratory clinical study, the investigators will attempt to demonstrate that ARFI, VisR, and DDAI ultrasound reliably detect malignant breast masses (Aim #1) and distinguish masses that respond to chemotherapy from those that do not (Aim #2). The ARFI, VisR, and DDAI imaging location will be on the surface of the breast, above the suspicious or malignant mass. This unblinded, open-label, exploratory study will be conducted in 40 women with diagnosed BIRADS-4 or -5 masses in Aim #1 and in 40 women with malignant masses undergoing neoadjuvant chemotherapy (NAC) in Aim #2.
The primary objective of breast cancer screening is to identify early stage cancer, or precancerous lesions, at a time before symptoms emerge and when treatment is likely to result in a cure. Screening is beneficial when it averts progression of disease to metastasis and/or death, but adverse effects to patients (and unnecessary medical expense) may result downstream from false positives and indiscrimination of masses that will not respond to treatment. The sensitivity of digital mammography, the current screening standard in the US, has been reported in the range of 0.40 to 0.85, with a positive predictive value of 0.31. Sensitivity is increased by augmenting mammography with MRI and B-Mode ultrasound, but false positive rates may also increase3. There exists a vital need for a screening technology that exhibits high sensitivity and specificity for cancer detection with early identification of unresponsive masses. This urgent need could be met by exploiting new imaging biomarkers. Specifically, the mechanical properties of breast tissue have been used for cancer detection, with both elasticity and viscosity demonstrated for discriminating malignant from benign lesions. Further, tissue anisotropy has been shown to correlate with core biopsy result and tumor grade, with large cancers significantly more anisotropic than small cancers. Importantly, while both MRI and ultrasound can be used to measure these biomarkers, ultrasound's cost effectiveness and ease of implementation render it an efficient platform to pursue. The long-term goal of this research program is to develop a new ultrasound-based breast-screening tool to augment mammography. As a critical first step toward achieving this goal, the primary objective of the proposed research is to evaluate in vivo the diagnostic relevance of ultrasound-derived metrics for stiffness, elasticity, viscosity, and anisotropy. These biomarkers will be measured using novel, noninvasive ultrasound technologies under development in Dr. Gallippi's laboratory: 1) Acoustic Radiation Force Impulse (ARFI) ultrasound for interrogating tissue stiffness, 2) Viscoelastic Response (VisR) ultrasound for assessing tissue elasticity and viscosity, and 3) Dynamic Displacement Anisotropy Imaging (DDAI) for measuring tissue anisotropy. These technologies have been demonstrated previously for delineating atherosclerosis, muscular dystrophy, and renal dysfunction. A.1.2.State the research question(s) (i.e., specific study aims and/or hypotheses). The investigators hypothesize that ultrasound-derived stiffness, elasticity, viscosity, and anisotropy will correlate with lesion malignancy and response to treatment. To test this hypothesis, they will pursue the following specific aims: Aim #1: Quantify the ability of ultrasound-derived stiffness, elasticity, viscosity, and anisotropy to detect malignancy. ARFI, VisR, and DDAI imaging will be performed on suspicious breast lesions in 40 women with BIRADS-4a, 4b, 4c, or -5 ratings. The diagnostic accuracy of imaging metrics will analyzed, with malignancy confirmed by histology as the outcome. Aim #2: Quantify the ability of ultrasound-derived stiffness, elasticity, viscosity, and anisotropy to predict a positive response to treatment. ARFI, VisR, and DDAI imaging will be performed serially - once every four weeks over the course of neoadjuvant chemotherapy (NAC) - on malignant breast lesions in 40 women. Changes in outcome metrics over time will be correlated to overall reduction in tumor size (diameter and area). The ability of ultrasound metrics to predict a positive response to treatment will be examined. A positive response to treatment will be determined according to the Response Evaluation Criteria in Solid Tumors (RECIST) guidelines.
Study Type
OBSERVATIONAL
Enrollment
45
Breast ultrasound
University of North Carolina
Chapel Hill, North Carolina, United States
Correlation of Peak Displacement (PD) for Detecting Malignancy
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate peak displacement (PD) and correlated with biopsy findings of malignant or benign. Peak Displacement (PD) - Maximum displacement of tissue in the breast lesion after an Acoustic Radiation Force Impulse (ARFI) excitation. Participants who have undergone breast ultrasonogram were categorized as BIRADS-4a, 4b, 4c, or -5 masses.
Time frame: Baseline imaging
Weighted Correlation Between Peak Displacement (PD) to Predict Response to Neoadjuvant Chemotherapy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate peak displacement (PD) and correlated with biopsy findings of malignant or benign. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans. Peak Displacement (PD) - Maximum displacement of tissue in the breast lesion after an Acoustic Radiation Force Impulse (ARFI) excitation.
Time frame: Up to 8 months
Weighted Correlation Between Displacement at a Given Time (TD) for ARFI to Predict Response to Neoadjuvant Chemotherapy
The ultrasound data was processed to calculate displacement at a given time (TD) for ARFI and statistically correlated to response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Acoustic Radiation Force Impulse (ARFI) - Ultrasound imaging technique in which a sacoustic pulse is transmitted into tissue, causing it to displace and recover in \<1 ms. The tissue displacement was used to estimate stiffness and viscosity. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesion not shrinking by 25% or more over the course of chemotherapy. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans.
Time frame: Up to 8 months
Weighted Correlation Between Relative Elasticity (RE) to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data will be processed to calculate relative elasticity (RE) and statistically correlated to response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Relative Elasticity (RE) - Qualitative estimate for tissue stiffness in the breast lesion based on VisR imaging. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesion not shrinking by 25% or more over the course of chemotherapy. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans.
Time frame: Up to 8 months
Weighted Correlation Between Relative Viscosity (RV) to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data will be processed to calculate relative viscosity (RV) and statistically correlated to response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Relative Viscosity (RV) - Qualitative estimate for tissue viscosity in the breast lesion based on VisR imaging. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesions not shrinking by 25% or more over the course of chemotherapy. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans.
Time frame: Up to 8 months
Weighted Correlation Between Tissue Mass (TM) for VisR to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data will be processed to calculate tissue mass (TM) for VisR and statistically correlated to the response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Tissue Mass (TM) - Qualitative estimate for tissue mass in the breast lesion based on VisR imaging. Viscoelastic Response (VisR) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into the tissue, causing it to displace and recover. The tissue recovery curve is then fit to a mass-spring-damper physics model to estimate stiffness and viscosity. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesions not shrinking by 25% or more over the course of chemotherapy. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans.
Time frame: Up to 8 months
Comparison of ARFI PD Values at 90o Versus 0o Transducer Orientations for DDAI to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data will be processed to calculate the ratio of ARFI PD values at 90o versus 0 o transducer orientations for DDAI and statistically correlated to the response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Acoustic Radiation Force Impulse (ARFI) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into the tissue, causing it to displace and recover in less than a millisecond. The tissue displacement can be tracked and used to estimate stiffness and viscosity. Peak Displacement (PD) - Maximum displacement of tissue in the breast lesion after an ARFI excitation. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesions not shrinking by 25% or more. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks btwn.
Time frame: Up to 8 months
Comparison of Ratio of ARFI PD Values at 90o Versus 0o Transducer Orientations for DDAI to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data was processed to calculate ratio of VisR RE values at 90o versus 0o transducer orientations for DDAI and statistically correlated to response of treatment with neoadjuvant chemotherapy. Values were weighted based on the number of imaging visits during subjects' treatment. Participants were imaged at baseline and end of each chemo cycle. Patients were imaged 3-8 times w/ 3-4 weeks btwn scans. Viscoelastic Response (VisR) - Ultrasound technique in which an acoustic pulse is transmitted into the tissue, causing it to displace and recover. Tissue recovery is fit to a mass-spring-damper physics model to estimate stiffness and viscosity. Relative Elasticity (RE) - Qualitative estimate for tissue stiffness in the breast lesion based on VisR imaging. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesions not shrinking by 25% or more over the course of chemotherapy.
Time frame: Up to 60 days
Weighted Correlation Between Ratio of RV Values at 90o Versus 0o Transducer Orientations for DDAI to Predict Response to Neoadjuvant Chemotherapy.
The ultrasound data will be processed to calculate ratio of RV values at 90o versus 0o transducer orientations for DDAI and statistically correlated to response of treatment with neoadjuvant chemotherapy. These values were weighted based on the number of imaging visits during subjects' treatment. Participants were imaged at baseline and end of each chemotherapy cycle. Patients were imaged 3-8 times w/ 3-4 weeks between scans. Relative Viscosity (RV) - Qualitative estimate for tissue viscosity in the breast lesion based on VisR imaging. Response to chemo - Defined as the lesion shrinking by 25% or more over the course of chemotherapy. Non-responders to chemo - Defined as lesion not shrinking by 25% or more over the course of chemotherapy.
Time frame: Up to 8 months
Correlation of Displacement at a Given Time (TD) for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate displacement at a given time (TD) for ARFI and correlated with biopsy findings of malignant or benign. Acoustic Radiation Force Impulse (ARFI) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into tissue, causing it to displace and recover in less than a millisecond. The tissue displacement can be tracked and used to estimate stiffness and viscosity. Participants were imaged at baseline.
Time frame: Baseline
Correlation of Relative Elasticity (RE) for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate relative elasticity (RE) and correlated with biopsy finding of malignant or benign. Relative Elasticity (RE) - Qualitative estimate for tissue stiffness in the breast lesion based on VisR imaging.
Time frame: Baseline
Correlation of Relative Viscosity (RV) for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate relative viscosity (RV) and correlated with biopsy findings of malignant or benign. Relative Viscosity (RV) - Qualitative estimate for tissue viscosity in the breast lesion based on VisR imaging. Participants were imaged according to their neoadjuvant chemotherapy schedule, at baseline and end of each chemotherapy type
Time frame: Baseline
Correlation of Tissue Mass (TM) for VisR for Detecting Malignancy
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate tissue mass (TM) for VisRand correlated with biopsy findings of malignant or benign. Participants were imaged according to their neoadjuvant chemotherapy schedule, at baseline and end of each chemotherapy type Viscoelastic Response (VisR) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into the tissue, causing it to displace and recover. The tissue recovery curve is then fit to a mass-spring-damper physics model to estimate stiffness and viscosity.
Time frame: Baseline
Correlation of Ratio of ARFI PD Values at 90o Versus 0o Transducer Orientations for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate ratio of ARFI PD values at 90o versus 0o transducer orientations for DDAI and correlated with biopsy findings of malignant or benign. Participants were imaged according to their neoadjuvant chemotherapy schedule, at baseline and end of each chemotherapy type Acoustic Radiation Force Impulse (ARFI) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into the tissue, causing it to displace and recover in less than a millisecond. The tissue displacement can be tracked and used to estimate stiffness and viscosity. Peak Displacement (PD) - Maximum displacement of tissue in the breast lesion after an ARFI excitation.
Time frame: Baseline
Correlation of Ratio of VisR RE Values at 90o Versus 0o Transducer Orientations for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate the ratio of VisR RE values at 90o versus 0o transducer orientations for DDAI and correlated with biopsy findings of malignant or benign. Participants were imaged according to their neoadjuvant chemotherapy schedule, at baseline and end of each chemotherapy type Viscoelastic Response (VisR) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into the tissue, causing it to displace and recover. The tissue recovery curve is then fit to a mass-spring-damper physics model to estimate stiffness and viscosity. Relative Elasticity (RE) - Qualitative estimate for tissue stiffness in the breast lesion based on VisR imaging.
Time frame: Baseline
Correlation of Ratio of VisR RV Values at 90o Versus 0o Transducer Orientations for Detecting Malignancy.
The correlation of each ultrasound metric will be analyzed by constructing separate receiver operating characteristic (ROC) curves. The ultrasound data were processed to calculate ratio of VisR RV values at 90o versus 0o transducer orientations for DDAI and correlated with biopsy findings of malignant or benign. Participants were imaged according to their neoadjuvant chemotherapy schedule, at baseline and end of each chemotherapy type Displacement at Time (TD) - Displacement of tissue in the breast lesion at time t=0.2 ms after an ARFI excitation. Viscoelastic Response (VisR) - Ultrasound imaging technique in which a strong acoustic pulse is transmitted into tissue, causing it to displace and recover. The tissue recovery curve is then fit to a mass-spring-damper physics model to estimate stiffness and viscosity. Relative Viscosity (RV) - Qualitative estimate for tissue viscosity in the breast lesion based on VisR imaging.
Time frame: Baseline
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