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A Report by the Alliance for Breast Cancer Screening I Original Article | Breast Imaging eISSN 2005-8330 https://doi.org/10.3348/kjr.2019.0006 Korean J Radiol 2019;20(12):1638-1645 Effect of Different Types of Mammography Equipment on Screening Outcomes: A Report by the Alliance for Breast Cancer Screening in Korea Bo Hwa Choi, MD, PhD1, Eun Hye Lee, MD, PhD2, Jae Kwan Jun, MD, PhD3, Keum Won Kim, MD, PhD4, Young Mi Park, MD, PhD5, Hye-Won Kim, MD, PhD6, You Me Kim, MD, PhD7, Dong Rock Shin, MD8, Hyo Soon Lim, MD, PhD9, Jeong Seon Park, MD, PhD10, Hye Jung Kim, MD11; Alliance for Breast Cancer Screening in Korea (ABCS-K) 1Department of Radiology, Gyeongsang National University School of Medicine and Gyeongsang National University Changwon Hospital, Changwon, Korea; 2Department of Radiology, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea; 3National Cancer Control Institute, National Cancer Center, Goyang, Korea; 4Department of Radiology, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea; 5Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea; 6Department of Radiology, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea; 7Department of Radiology, Dankook University Hospital, Dankook University College of Medicine, Cheonan, Korea; 8Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea; 9Department of Radiology, Chonnam National University Hwasun Hospital, Chonnam National University College of Medicine, Hwasun, Korea; 10Department of Radiology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea; 11Department of Radiology, Kyungpook National University Medical Center, Kyungpook National University College of Medicine, Daegu, Korea Objective: To investigate the effects of different types of mammography equipment on screening outcomes by comparing the performance of film-screen mammography (FSM), computed radiography mammography (CRM), and digital mammography (DM). Materials and Methods: We retrospectively enrolled 128756 sets of mammograms from 10 hospitals participating in the Alliance for Breast Cancer Screening in Korea between 2005 and 2010. We compared the diagnostic accuracy of the types of mammography equipment by analyzing the area under the receiver operating characteristic curve (AUC) with a 95% confidence interval (CI); performance indicators, including recall rate, cancer detection rate (CDR), positive predictive value1 (PPV1), sensitivity, specificity, and interval cancer rate (ICR); and the types of breast cancer pathology. Results: The AUCs were 0.898 (95% CI, 0.878–0.919) in DM, 0.860 (0.815–0.905) in FSM, and 0.866 (0.828–0.903) in CRM (p = 0.150). DM showed better performance than FSM and CRM in terms of the recall rate (14.8 vs. 24.8 and 19.8%), CDR (3.4 vs. 2.2 and 2.1 per 1000 examinations), PPV1 (2.3 vs. 0.9 and 1.1%), and specificity (85.5 vs. 75.3 and 80.3%) (p < 0.001) but not in terms of sensitivity (86.3 vs. 87.4 and 86.3%) and ICR (0.6 vs. 0.4 and 0.4). The proportions of carcinoma in situ (CIS) were 27.5%, 13.6%, and 11.8% for DM, CRM, and FSM, respectively (p = 0.003). Conclusion: In comparison to FSM and CRM, DM showed better performance in terms of the recall rate, CDR, PPV1, and specificity, although the AUCs were similar, and more CISs were detected using DM. The application of DM may help to improve the quality of mammography screenings. However, the overdiagnosis issue of CIS using DM should be evaluated. Keywords: Breast neoplasms; Digital mammography; Screening; Sensitivity and specificity Received January 4, 2019; accepted after revision July 29, 2019. This study was supported by a grant from the National R&D Program for Cancer Control, Ministry of Health & Welfare, Republic of Korea (1520200). Corresponding author: Eun Hye Lee, MD, PhD, Department of Radiology, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, 170 Jomaru-ro, Bucheon 14584, Korea. • Tel: (8232) 621-5851 • Fax: (8232) 621-6950 • E-mail: [email protected] This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https:// creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 1638 Copyright © 2019 The Korean Society of Radiology Different Types of Mammography Equipment and Screening Outcomes INTRODUCTION fully described in our previous report (3). Ten university- affiliated hospitals which participated in both the NCSP The incidence of breast cancer in Korea has been and the ABCS-K were involved in this retrospective study. increasing, and currently, breast cancer is the most common This study was approved by the Institutional Review Boards cancer among Korean women after thyroid cancer (1). The of all participating hospitals, and the need for informed incidence of breast cancer in Korea is the highest among participant consent was waived. women in their late 40s, which is approximately 10 years We collected information about participants, radiologists, less than the typical age of incidence in Western countries. and the mammography equipment that was used from all Unfortunately, the proportion of women with dense breast participating hospitals between January 2005 and December tissue is high in women in their 40s and 50s; therefore, 2010. Our research database was matched with the early detection of breast cancer at these ages is difficult (2). databases of the NCSP and the National Health Insurance Korean women aged 40 years or older have been advised Service (NHIS), where the results of mammography to undergo biannual mammography screenings under the screenings and cancer outcomes were available, respectively. auspices of the National Cancer Screening Program (NCSP) We extracted the number of enrolled cases according to the since 1999. A recent study conducted by the Alliance for types of mammography equipment used: FSM, CRM, and DM. Breast Cancer Screening in Korea (ABCS-K) showed that We considered the American College of Radiology Breast the sensitivity and cancer detection rate (CDR) during Imaging-Reporting and Data System (ACR BI-RADS) mammography screenings were comparable to those categories 1 and 2 as negative results and categories 0, obtained during screening programs in Western countries 4, and 5 as positive results (14). We obtained information (3). However, the recall rate, positive predictive value about cancer diagnoses from the NHIS database until (PPV), and specificity were suboptimal compared to those December 2011 to account for the 12-month period after reported in Western studies. These differences could be the screening. Breast cancers included both invasive cancer due to various factors such as examinees, radiologists, and and carcinoma in situ (CIS). equipment. Until now, many studies on the impact of screening Outcome Measurements and Statistical Analysis with digital mammography (DM) have shown that the The diagnostic accuracy in the detection of breast diagnostic accuracy of DM is similar to that of film-screen cancer was assessed through calculation of the area under mammography (FSM). It is noteworthy that several studies the curve (AUC) and the corresponding 95% confidence have shown that the use of DM for screening purposes could intervals (CI) from a receiver operating characteristic improve the diagnostic performance significantly compared (ROC) curve analysis for FSM, CRM, and DM. The AUCs were to FSM among women under the age of 50 and women with compared using the method described by DeLong et al. (15). dense breasts (4-6). However, some studies have argued We also calculated performance indicators, including the that DM has inferior recall rates and PPV (7-10). To our recall rate, CDR per 1000 examinations, PPV1, sensitivity, knowledge, no comparative studies on the impact of DM specificity, false positive rate (FPR), and interval cancer rate have been conducted among Asian women, who tend to (ICR) per 1000 negative examinations and compared them have dense breasts (11-13). according to the types of equipment used. The performance The study period was from 2005 to 2010 during the indicators were defined according to the ACR BI-RADS ABCS-K, which was the transitional time from FSM or (14). The recall rate was calculated as the percentage of computed radiography mammography (CRM) to DM in Korea. examinations that were screened and recalled for further Thus, we aimed to investigate how the different types of evaluation. The CDR was calculated as the number of mammography equipment affect the screening outcomes in breast cancer cases detected per 1000 examinations. The Korean women. interval cancers were defined as histology-proven invasive or in situ cancers found within one year following the MATERIALS AND METHODS negative screening. In addition, the ICR was calculated as the number of interval cancer incidents per 1000 negative Study Population and Data Collection examinations. The PPV1 refers to the percentage of all The study population and data collection methods were positive screening examinations that resulted in histology- kjronline.org https://doi.org/10.3348/kjr.2019.0006 1639 Choi et al. proven breast cancers within one year following the Table 1. Mammography Systems Used in Alliance for Breast screening. We used the Wald chi-squared test to compare Cancer Screening
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