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Computer‐aided heterogeneity analysis in breast MR imaging assessment of ductal carcinoma in situ: Correlating histologic grade and receptor status
Author(s) -
Chou ShinnHuey S.,
Gombos Eva C.,
Chikarmane Sona A.,
Giess Catherine S.,
Jayender Jagadeesan
Publication year - 2017
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.25712
Subject(s) - ductal carcinoma , medicine , breast cancer , institutional review board , estrogen receptor , univariate analysis , breast imaging , pathology , multivariate analysis , oncology , radiology , nuclear medicine , mammography , cancer , surgery
Purpose To identify breast MR imaging biomarkers to predict histologic grade and receptor status of ductal carcinoma in situ (DCIS). Materials and Methods Informed consent was waived in this Health Insurance Portability and Accountability Act‐compliant Institutional Review Board‐approved study. Case inclusion was conducted from 7332 consecutive breast MR studies from January 1, 2009, to December 31, 2012. Excluding studies with benign diagnoses, studies without visible abnormal enhancement, and pathology containing invasive disease yielded 55 MR‐imaged pathology‐proven DCIS seen on 54 studies. Twenty‐eight studies (52%) were performed at 1.5 Tesla (T); 26 (48%) at 3T. Regions‐of‐interest representing DCIS were segmented for precontrast, first and fourth postcontrast, and subtracted first and fourth postcontrast images on the open‐source three‐dimensional (3D) Slicer software. Fifty‐seven metrics of each DCIS were obtained, including distribution statistics, shape, morphology, Renyi dimensions, geometrical measure, and texture, using the 3D Slicer HeterogeneityCAD module. Statistical correlation of heterogeneity metrics with DCIS grade and receptor status was performed using univariate Mann‐Whitney test. Results Twenty‐four of the 55 DCIS (44%) were high nuclear grade (HNG); 44 (80%) were estrogen receptor (ER) positive. Human epidermal growth factor receptor‐2 (HER2) was amplified in 10/55 (18%), nonamplified in 34/55 (62%), unknown/equivocal in 8/55 (15%). Surface area‐to‐volume ratio showed significant difference ( P < 0.05) between HNG and non‐HNG DCIS. No metric differentiated ER status (0.113 < p ≤ 1.000). Seventeen metrics showed significant differences between HER2‐positive and HER2‐negative DCIS (0.016 < P < 0.050). Conclusion Quantitative heterogeneity analysis of DCIS suggests the presence of MR imaging biomarkers in classifying DCIS grade and HER2 status. Validation with larger samples and prospective studies is needed to translate these results into clinical applications. Level of Evidence: 3 Technical Efficacy: Stage 3 J. Magn. Reson. Imaging 2017;46:1748–1759.