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Breast Density and Beyond:
Prediction and Risk Assessment in Breast Imaging
CBIGComputational Breast
Imaging Group
Emily F. Conant, M.D.Professor, Chief Division of Breast Imaging
Vice Chair of Faculty DevelopmentDepartment of Radiology
University of Pennsylvania
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Outline
Risk Assessment in Breast Imaging:
–What’s all the fuss about Breast Density? • Implications for screening
• How to measure? Limitations?
–Beyond Breast Density - “Breast Phenotyping”
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Breast Density: BI-RADS categories
Increasing Density: Decreasing Mammography Performance
Increasing Density: Increasing Risk of Developing Cancer
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• Breast Density Notification Legislation:
• >50% U.S. states, dense breasts consider supplemental screening
• not risk based, screening modality not specified
• Now Federal government charged with making uniform statement
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Two-part Risk:• The individual risk of developing breast cancer
• Gail, Claus risk assessment models, BRCA ½ , etc.
• The masking risk (false-negative) and risk for a false-positive outcome• Unnecessary call-backs, biopsies, or missed cancer
General Population
Population with Disease
How to Risk Stratify in Breast Imaging?
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Two-part Risk:• The individual risk of developing breast cancer
• Gail, Claus risk assessment models, BRCA ½ , etc.
• The masking risk (false-negative) and risk for a false-positive outcome• Unnecessary call-backs, biopsies, or missed cancer
Population with Disease
General Population
Tailored imaging
Guided biopsy/diagnosis
Risk
Stratification
How to Risk Stratify in Breast Imaging?
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Imaging Phenotypes
How can we use imaging data to help guide
personalized screening?
What’s all the fuss about “breast density”???
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NI PI P2 DY
Wolfe, 1976 AJR
Lowest risk Highest risk
Imaging in Risk Assessment
Wolfe’s Parenchymal Classifications
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Women with >50% dense breasts are at a 3- to 5X greater
risk for breast cancer than when lowest density 2
– Partially due to lower sensitivity with increased density (masking)
– Partially due to Biology - dense tissue is rich in epithelium/stroma
Boyd 1995, 2Tice Ann Intern Med. 2008
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Breast Density & Risk
Established, independent risk factorMcCormack et al. Cancer Epidemiol Biomarkers Prev. 2006
Eng et al. Breast Cancer Res. 2014Sherratt et al. Breast Cancer Res. 2016
Improves risk assessment modelsBrentnall et al. Breast Cancer Res. 2015
Tice et al. Ann Intern Med. 2008
Has shared genetic basis with breast cancer susceptibility
Stone et al. Cancer Res. 2015Lindström et al. Nat Commun. 2014
Predicts both inherent risk and masking risk
Krishnan et al. Breast Cancer Res. 2016Strand et al. Int J Cancer 2017
Associated with tumor profileBertrand et al. Cancer Epidemiol Biomarkers Prev. 2015 LIBRA
Cumulus
Volpara
Quantra
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Biology and Breast Density
• Breast cancers tend to arise in dense tissue1…
• Breast density and cancers have shared genetic2
– SNP and BRCA data
• Some risk factors mediated thru breast density3,4
– Aromatase/Estrogen levels, chemoprevention
1Pereira SM et al. SM CEBP 2011 1718-252Varghese JA et al. Cancer Res 2012:72; 1478-843Cuzick J et al. JNCI 2011:103;744-52.4Greendale GA et al. JNCI 20013:95;30-37.
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Risk Factors (i.e., reproductive, anthropometric,
dietary)
Genetics (including
determinants of mammo density)
Hormones and growth factors (IGF-1,
TIMP-3)
Epithelial, stromal,
fibroblast proliferation
Dense, stiff breast
tissue
Breast Cancer
Biological Hypothesis:
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How do we measure
“Breast Density”?
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First: How to Measure Breast Density?
• BI-RADS: Inter and intra-reader variability
– Between readers only K=0.56
• Relative risk (RR) for density d vs a ~ 3-5x
– 80% of screened women are density b or c
Cummings SR et al. JNCI 2009;101:384-398.
da
80%
b c
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First: How to Measure Breast Density?
• RR for density c vs b = <1.5
– Average density at screen is between b-c
• RR for density c vs “average” ~ 1.2
• RR for density d vs “average” ~ 2.1
Cummings SR et al. JNCI 2009;101:384-398.
b c da AVERAGE
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Sprague, Conant et al. Annals 2016
What about Inter-reader variability with BI-RADS?
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BI-RADS Breast Density
BI-RADS 4th Edition BI-RADS 5th Edition
1 - Almost Entirely Fatty (<25%) a – The breasts are almost entirely fatty
2 - Scattered Fibroglandular (25-50%) b- There are scattered areas of fibroglandulardensity
3 - Heterogeneously Dense (51-<75%) c – The breasts are heterogeneously dense, which may obscure small masses
4 - Extremely Dense (>75% ) d – The breasts are extremely dense, which lowers the sensitivity of mammography
Issues to Consider: • New categories without % - category now based on “densest area”• What are “small masses”???
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Semi-automated Measure of
Area Percent Density (PD)
Cumulus (Univ. Toronto)
Courtesy of Dr. Yaffe
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Issues with Area-based Measurements?
Modified from Medical Physics, Vol. 42, No. 12, December 2015
Area PD= 0%
Volume PD=0%
Area PD=5%
Volume PD=5%Area PD=5%
Volume PD=13%
Breast in compression in CC view:
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Limitations in using Mammography
to measure Percent Density
• Most methods based on a dichotomous threshold– “Dense or not dense” (not many shades of grey!)
• Different image acquisition effect results
• Most methods don’t consider breast thickness
• Significant inter and intra-reader variability!!!!!!!
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How should we measure
Breast Density???
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1. Breast volume (cc)
2. Dense-tissue volume (cc)
3. Volumetric Percent Density (VPD%)
hfg
hadipose h
Breast Model
xpix
ypix
Automated Volumetric Analysis
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Risk Prediction varies by method used…
BI-RADS
Quantita
tive M
eth
ods
Eng A et al. BCR 2014; 16: 439.
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Is it Percent (%) or Absolute Volume?
62 cc 197 cc139 cc 233 cc
Four women with ~ 25% fibro-glandular VOLUME (FGV)
Which is a more accurate predictor of “risk”?
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What about other imaging Biomarkers?
Breast “Complexity” confounds diagnosis…
But, is it related to risk?
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Digitized
film mammogramsDigital
mammograms
Parenchymal Texture Indicative of Genetic
Risk Markers (BRCA1/2)
Huo et al. Radiology 2002
Li et al. J Med Imag. 2014
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Texture Analysis with Varying Regions of Interest
• Increasing sampling variation increases discrimination– Using gray-scale intensity features
– Co-occurence descriptors
– Run-length features
– Structural/pattern measures
– Spectral features
Gastounioti A et al. Breast Cancer Res 2016;18:91.
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Next Generation Technologies:
Deep Imaging Phenotyping of
Breast Cancer Risk
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Gray-level histogram statistics
Co-occurrence features
Run-length measures Structural features
Texture descriptors extracted in each anatomically-sampled region
1 2 34
…Texture Feature
Maps to
“Complexity
Score”
Gastounioti et al. Sci Rep 2018;8(1):17489.
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Density and Texture: Complementary Risk Factors
• Case-control Study: – 424 Women (106 cancers)
– Age-matched 1:3; 5yr intervals
• Risk Factors:– Demographics, Breast Density (PD%)
– Multi-Parametric Texture Features
• All independently predictive of cancer in a combined model:– Significantly better together than alone
(Delong’s test: p<0.05).
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 - Specificity
Sen
sit
ivit
y
Texture + PD% + Standard Risk Factors; AUC: 0.84
Standard Risk Factors + PD%; AUC: 0.64
Reference Line; AUC: 0.5
Zheng et al. Medical Physics 2015Gastounoiti A et al. Acad Radiol. 2018;25(8):977-984
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Phenotypes of parenchymal complexity capture
different information than conventional
breast density
Work in progressCS = 0.72
PD = 14.3%
CS = -0.68
PD = 7.9%CS = 0.64
PD = 41.7%
CS = -0.65
PD = 42.5%
DenseNon-Dense
Kontos D et al. Radiol 2019;290(1):41-49.
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What about Digital Breast
Tomosynthesis?
8th International Breast Density and Cancer Risk Assessment WorkshopJune 8th, 2017
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Evolution of mammographic screening
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Synthetic 2D
mammogram
Optimization of existing 2D pipelines:
• DBT slices
• Synthetic Mammograms
Extensions to 3D for image volumes
• Voxel anisotropy
• Computational cost
Evaluate prediction capacity DBT
features
• Large, multi site/vendor prospective
datasets
Employ deep learning (DL) technologies
• Supervised/Unsupervised tools
• Visualization of DL features 3D image volume Automated ML
texture & density
Research & Technical Challenges of DBT
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Transition to Tomosynthesis:Fully-automated breast density estimation using machine learning
Volumetric Breast density assessment
from Digital Breast Tomosynthesis
Absolute dense volume (DV)
Volumetric percent density (VPD)
Petruz et al., Radiology 2016
* Keller et al., Med Phys2012 www.med.upenn.edu/sbia/libra.html
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Transition to Tomosynthesis:Fully-automated breast density estimation using machine learning
* Keller et al., Med Phys2012 www.med.upenn.edu/sbia/libra.htmlCourtesy A. Gastounoiti PhD
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What about MR Breast
Parenchymal Enhancement in
Risk Predictor?
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Minimal< 25% Mild
25-50% Moderate50-75% Marked
>75%
MR Background Parenchymal Enhancement*
*generally measured on first MIP post Gd
% of fibroglandular tissue that enhances
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What about BPE as Risk Marker?
BPE has been shown to be predictor of risk1
• MR allows 3D volumetric measures– Fibroglandular tissue and physiology of glandular enhancement
• Few studies, most based on BI-RADs categories– Minimal, mild, moderate, marked
– Reader variability, decreases with training2
– Variable across magnetic fields (1.5T vs 3T)3
1King V. Radiology 20112Melsaether A et al. AJR 20143Giess CS et al. Radiographics 2014
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DCE-MRI: Enhancement vs. Risk
V. King et al. Radiology 2011
FGT
BPE
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DCE-MRI: Effect of Treatment
V. King et al. Radiology 2012
FGT
BPE
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Whole-breast segmentation
FGT segmentation
CE-MRI FGT% Estimation
S. Wu, et al. Med Phys 2013;40(12);122302
FGT% = green x 100red
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Subtraction Image
BPEsegmentation
CE-MRI BPE% Estimation
S. Wu, et al. Med Phys 2013;40(12);122302
BPE% = pink x 100green
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5-yr risk: 1656 MR screens,1183 HR women • Compared Image-Deep Learning (DL) to:
– Tyrer Cuzick (TR)
– Logistic Regression (LR) models
• AUC’s:• TK: 0.493
• RF-LR: 0.558
• Image DL: 0.638
Pornoi T et al. AJR 2019; 213:1-7.
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Penn data: 50 BRCA1/2 carriers: – Absolute, relative measures of BPE/FGT pre and post risk
reduction salpingo-oophrectomy (RRSO)
• 44 pts with no cancer – showed signif change in BPE
• 6 pts developed cancer – no change in BPE/FGT
DeLeo et al. AJR 2015;204(3):699-73.
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Pre-RRSO Post-RRSO1 p-value
FGV 2.630.78 2.580.75 p=0.622
BPE 2.450.93 1.870.81 p=0.0001
1 Mean time to post-RRSO MRI = 8.3 months 7 months
DeLeo et al. AJR 2015;204(3):699-73.
Average BI-RADS scores to calculate mean
FGT and BPE before and after RRSO
✓
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Patient without cancer….
DeLeo et al. AJR 2015;204(3):699-73.
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Patient that developed cancer…
DeLeo et al. AJR 2015;204(3):699-73.
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Breast Parenchymal Enhancement
• BPE more strongly associated with risk than FGT on CE-MRI1
• BPE associated with increased breast cancer risk in both pre-
and post menopausal women1
• BPE changes associated with effectiveness of risk reduction
interventions2
1King et al. Radiol 2011: 260(1):50-60.2DeLeo et al. AJR 2015;204(3):699-73.
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Test availability, Performance, Cost, patient preference
Screening Discussion
Provider knowledgePatient perception
& preferencesDecision-making
tools
Determine Risk Level
AgeGenetics
Family Hx, Reproductive Hx,
Breast Bx, HRT use Breast
Density/Complexity, Screening Hx
Liquid Biopsy?
Screening Awareness
Recommend Screening?
Here?
Definitely Here
Here?
Onega T, Conant EF et al. Breast Cancer Screening in Era of Personalized Regiments. Cancer 2014
The Future of Precision Screening: Optimizing choices to maximize benefit, minimize harm and ensure access
Where does
the
Radiologist
fit in?
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Summary
Breast Density, Complexity and CE-MR BPE:
• When added to risk models, improves risk estimation– Developing breast cancer, risk of false positives, false negatives
• Have use in guiding personalized screening– Appropriate screening intervals and use of supplemental screening
• Are predictors of risk reduction strategies– One of the few, modifiable risk factors
Need robust, reproducible measures translated into clinics!!
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Thank you!
Cybele, the Goddess of Fertility by Mihail Chemiakin
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Breast Imaging Division
Susan P. Weinstein MD
Emily F. Conant MD
Elizabeth McDonald MD PhD
CBIG Lab Members
Despina Kontos PhD
Brad Keller PhD
Shonket Ray PhD
Lin Chen PhD
Dong Wei PhD
Aimilia Gastounioti PhD
Andrew Oustimov MPH
Lauren Pantalone BS
Shandong Wu PhD (UPitt)
Affiliated Clinical Trainees
Samantha Zuckerman MD
Katrina Korhonen MD
Geraldine Liao, MD
Jenny Rowland MD
Affiliated Research Staff
Michael Hsieh MS
Pati Sarthak MS
www.uphs.upenn.edu/radiology/research/labs/cbig/
Collaborations
Susan M. Domchek MD
Mitchell D. Schnall MD PhD
Angela Bradbury MD
Marilyn Schapira MD MPH
Marie Synnestvedt PhD
Katie Schmitz PhD MPH
Christos Davatzikos PhD
Jinbo Chen PhD
Angela DeMichele MD
Lewis Chodosh MD PhD
David Mankoff MD PhD
Michael Feldman MD PhD
Malcolm Pike PhD
(MSKCC)
Jonine Bernstein PhD
(MSKCC)
CBIGComputational Breast Imaging Group