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Abstract a) Brief description of the objective(s) The aim of this study is to compare contrast-enhanced mammography (CM) with magnetic resonance imaging (MRI) for preoperative locoregional staging of patients with early-stage breast cancer. b) Material(s) and method(s) Prospective, single-center study, approved by the Research Ethics Committee, which included patients with a histological diagnosis of invasive breast carcinoma, candidates for initial medical treatment. Patients treated with neoadjuvant chemotherapy and those in whom the tumor was completely resected in the initial biopsy were excluded. CM and MRI were performed in the week before surgery and the anatomopathological result of the surgical specimen was considered the gold standard. Pearson's modification (r) was used to compare tumor size between different methods. c) Results and discussion Thirty-seven patients were included, with a mean age of 54.5±6.9 years (43-70 years). The mean size of the tumors in pathology was 2.9±1.4 cm (1.1-8.0 cm) and the most common histological type was invasive ductal carcinoma (n=34;87.2%). The clinical stage was IA for 14 patients (37.8%) and IIA for 23 patients (62.2%). The main tumor was identified in 33 cases (89.2%) on conventional mammography and in all cases (100%) on both CM and MRI. There was excellent elasticity between tumor size measured on CM and MRI (r=0.897;p 0.01). When compared with tumor size in pathology, both methods were adopted in a good way (p 0.01), however, MRI was functionally superior to CM (r=0.847 vs. 0.683), while mammography conventional showed no therapeutic effect (r=0.222;p=0.21). Multifocal lesions were observed on CM in 2 cases (5.4%) and on MRI in 6 cases (16.2%), with 1 case confirmed as multifocal and the others presenting DCIS associated with the surgical specimen. Suspicious additional lesions were seen in 4 patients (10.8%) on CM and in 3 patients (8.1%) on MRI, of which one was confirmed as malignant in the contralateral breast, which had not been identified in previous exams. d) Conclusions CM showed good adaptability with MRI for assessing tumor size and searching for additional lesions, and may be a cheaper and more accessible alternative for preoperative staging in patients at an early clinical stage. Citation Format: Andressa Amorim, Andre Mattar, Almir Bitencourt, Paula Moraes, Flora Finguerman. CONTRAST MAMMOGRAPHY FOR PREOPERATIVE STAGING OF PATIENTS WITH EARLY BREAST CANCER: PRELIMINARY RESULTS abstract. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO5-07-10.
Amorim et al. (Thu,) studied this question.