biomarker discovery in locally advanced ......e leiden netherlands 3t philips ingenia f milan italy...
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BIOMARKER DISCOVERY IN LOCALLY ADVANCED CERVICAL CANCER: IQ-EMBRACE PETRA VAN HOUDT, JESPER KALLEHAUGE, UULKE VAN DER HEIDE, KARI TANDERUP MARCH 23, 2018
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Patients with large low-enhancing volumes in tumor (i.e. low perfusion) have a less favorable outcome
DCE-MRI FOR PREDICTION OF TREATMENT OUTCOME
Mayr et al. 2012
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Relation between DCE-MRI parameters and hypoxia
DCE-MRI FOR PREDICTION OF TREATMENT OUTCOME
Halle et al. 2012
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EVIDENCE FOR PROGNOSTIC VALUE OF DCE-MRI
Review of papers published between 1996 and 2014:
• Investigate association between pre-treatment DCE-MRI parameters (e.g. Maximum uptake, Abrix, Ktrans etc.) and outcome
• 18 papers from 10 groups
• Median 30 patients (range 7 – 102)
• 14 positive, 1 negative, 3 inconclusive
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DWI FOR PREDICTION OF TREATMENT OUTCOME
Das et al. 2015
Change in ADC can be used as predictor of early pathological response
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T2-weighted DWI, b = 800 s/mm2 ADC
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DWI FOR PREDICTION OF TREATMENT OUTCOME
Erbay et al. 2018
Lower maximum ADC value is associated with worse overall survival
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POTENTIAL FOR T2 MAPPING?
Large decreases in signal intensity in T2-weigthed images are correlated with a favorable outcome
Ma et al. 2011
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POTENTIAL FOR T2 MAPPING? PILOT STUDY
Courtesy of Sanne Wiegers
T2w
T2 map
Pre-treatment
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IQ-EMBRACE TRIAL
• Sub-study of EMBRACE-II
• Quantitative MRI to predict local recurrence after radio-chemotherapy of cervix cancer
• All institutes participating in EMBRACE-II who have possibility to perform additional pre-treatment MRI are eligible to participate
DCE
standard quantitative
T2w
DWI
T2
ADC
Ktrans
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PARTICIPATING INSTITUTES
Code Institute Country Field
Strength
Vendor
A Aarhus Denmark 1.5T Philips Ingenia
B AMC, Amsterdam Netherlands 3T Philips Ingenia
C CHUM, Montreal Canada 1.5T Siemens Magnetom
D UMC Ljubljana Slovenia 1.5T GE Optima
E Leiden Netherlands 3T Philips Ingenia
F Milan Italy 1.5T Philips Achieva
G McGill Canada 3T Philips Ingenia
H Mumbai India
I NKI, Amsterdam Netherlands 3T Philips Ingenia
J Oslo Norway 3T Siemens Skyra
K Vienna Austria 3T Siemens Magnetom
L Utrecht Netherlands 1.5T Philips Ingenia
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HOW TO ACHIEVE MULTI-CENTER CONSISTENCY?
1. Develop consensus MRI protocols
• How to deal with variations in equipment?
• How to avoid that the oldest equipment sets the standard?
2. Optimize MRI protocols for each scanner separately, using the newest available technology
• Accept variations in accuracy and precision
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QUALITY ASSURANCE PROCEDURE
Before start of patient inclusion
1. Quantitative assessment of sequences
• Accuracy
• Precision
2. Qualitative assessment of sequences
• SNR
• Check for image artifacts
Phantoms
Volunteers
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PHANTOM MEASUREMENTS
Clinical T2 protocol
Phantom T2, clinical
T2, phantom
Large differences due to: • Variations in protocol settings? • System differences?
Benchmark protocol
Phantom T2, benchmark
Equal on all systems Long, slow sequences which are “gold standards” No fancy acceleration Not practical for clinical use
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PHANTOMS
T1/T2 mapping Eurospin Phantom
T2 values: 49 – 212 ms (296 K) T1 values: 331 – 1615 ms (296 K)
ADC mapping QIBA diffusion Phantom
DCE-MRI Concentration series
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PROGRESS MEASUREMENTS
Code Institute Country Field
Strength
Vendor
A Aarhus Denmark 1.5T Philips Ingenia
B AMC, Amsterdam Netherlands 3T Philips Ingenia
C CHUM, Montreal Canada 1.5T Siemens Magnetom
D UMC Ljubljana Slovenia 1.5T GE Optima
E Leiden Netherlands 3T Philips Ingenia
F Milan Italy 1.5T Philips Achieva
G McGill Canada 3T Philips Ingenia
H Mumbai India
I NKI, Amsterdam Netherlands 3T Philips Ingenia
J Oslo Norway 3T Siemens Skyra
K Vienna Austria 3T Siemens Magnetom
L Utrecht Netherlands 1.5T Philips Ingenia
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EVALUATION DCE
• Direct evaluation of quantitative DCE parameters (e.g. Ktrans) not possible
• Follow guidelines QIBA DCE-MRI profile
• Evaluate individual steps of procedure:
1. Baseline T1 mapping
2. Signal stability for course of measurement
3. Signal linearity
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BASELINE T1 MAPPING
Benchmark = Inversion recovery sequence Clinical = variable flip angle series
Benchmark vs. reference values Clinical vs. Benchmark
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SIGNAL LINEARITY
Tubes with different concentrations of gadolinium (0 – 10 mM) Cervical tissue ~ 1 mM
Arterial input function ~ 8 mM
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PRELIMINARY RESULTS DWI
True ADC value = 1.109*10-3 mm2/s
AD
Cb
ias (%
) Institute
Benchmark Clinical QIBA requirements
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PRELIMINARY RESULTS T2 MAPPING
Benchmark = CPMG sequence Clinical = multi-echo spin echo sequence
Benchmark vs. reference values Clinical vs. Benchmark
T2 values in cervix tumors ~ 75 – 100 ms
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CONCLUSIONS
• IQ-EMBRACE is a trial that prospectively collects quantitative MRI for imaging biomarker discovery in patients with cervical cancer
• With the phantom measurements we evaluate the performance of quantitative MRI sequences across institutes and correct sequences if necessary
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NEXT STEPS
• Finish analysis of all data
• Finalize patient MRI protocols per institute
• Scan volunteer with final protocol
• Evaluate first patient data
• Monitor data quality
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ADVANCED IMAGE ANALYSIS WORKSHOP
Idea: workshop for participating centers about quantitative image analysis
• ADC mapping of DWI data
• Pharmacokinetic analysis of DCE-MRI
• Next EMBRACE meeting
Requirements
• Some patient data is available
• Interest from institutes
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ACKNOWLEDGEMENTS
Aarhus University Hospital Kari Tanderup Jesper Kallehauge
Radiotherapy Department Uulke van der Heide Cherita Sombroek Monique Bloemers
Amsterdam Medical Center Zdenko van Kesteren Henrike Westerveld
Leiden University Medical Center Remi Nout Jordi Vonk-van Oosten Marieke Stammes
University Medical Center Utrecht Nico van den Berg Ina Jürgenliemk-Schultz
UMC Lljubljana Robert Hudej Barbara Segedin
AKH Vienna Dietmar Georg Michaela Daniel Pascal Baltzer
Oslo University Hospital Eirik Malinen Heidi Lyng Djordje Kovacevik
CHUM Montreal Cynthia Ménard Jean-Charles Coté
Tata Memorial Hospital Supriya Chopra
McGill Montreal Ives Levesque
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BENCHMARK SEQUENCES
• T2 mapping
• Multi-echo spin echo
• No acceleration
• TR = 2000 ms
• Max TE = 200 ms; dTE and no. Echoes based on max TE
• Single slice: 250x250 mm2, voxel size 2 x 2 x 4 mm3
• T1 mapping
• Inversion recovery series
• No acceleration
• TR = 8000 ms
• IR delays: 30, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1000, 1250, 1500, 2000, 4000 ms
• Single slice, 2 x 2 x 4 mm3, 250 x 250 mm2
• DWI
• QIBA EPI sequence
• 4 b-values: 0, 500, 900, 200
• TR = 10s; TE = 101 ms
• Slice thickness 4 mm, 25 slices
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IDEAL CLINICAL PROTOCOL
Consists of:
• Anatomical sequences preferred by institute
• T2 mapping sequence
• B0 map
• DWI sequence
• B1 map (only for 3T)
• T1 mapping sequence
• DCE sequence
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ACCEPTABLE COMPROMISES
• Alternative for T2 mapping: separate T2-weighted images with different TE (e.g. Ljubljana)
• B1 mapping: separate scans from which a B1 map can be created with postprocessing (e.g. McGill)
• E.g. when not possible to save phase data for DCE-MRI
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