Naoki Hayashi1, Hiroko Tsunoda2, Maki Namura3, Tomohiro Ochi3, Koyu Suzuki4, Hideko Yamauchi3, Seigo Nakamura5. 1. Department of Breast Surgical Oncology, St. Luke's International Hospital, Tokyo, Japan. Electronic address: naokiha@luke.ac.jp. 2. Department of Radiology, St. Luke's International Hospital, Tokyo, Japan. 3. Department of Breast Surgical Oncology, St. Luke's International Hospital, Tokyo, Japan. 4. Department of Pathology, St. Luke's International Hospital, Tokyo, Japan. 5. Department of Breast surgical oncology, The Showa University School of Medicine, Tokyo, Japan.
Abstract
BACKGROUND: Magnetic resonance imaging (MRI) or ultrasonography (US) alone is limited in the ability to predict the pathologic complete response (pCR) accurately after neoadjuvant chemotherapy (NAC). The aim of the present study was to predict the pCR using MRI combined with second-look US in primary breast cancer patients. MATERIALS AND METHODS: A total of 1274 consecutive primary breast cancer patients who were examined by MRI and second-look US before and after NAC and had undergone breast-conserving surgery from 2004 to 2014 were included. The positive predictive value (PPV) of a clinical complete response (cCR) by MRI alone and MRI plus US was assessed. A CR was defined as no residual invasive carcinoma. The presence of a residual in situ component was also assessed (ypTis). RESULTS: Of the 1274 patients, 333 (26.1%) had a pCR (ypT0/is), and 102 (8.0%) had a residual in situ component (ypTis). A cCR was found in 247 patients (19.4%) using MRI alone and in 182 patients (14.3%) using MRI plus US. The PPV for a cCR using MRI alone was 79.4% and the PPV for MRI plus US was 86.8%. The PPV for a cCR by MRI plus US was the greatest at 98.1% in the estrogen receptor-negative (ER-)/human epidermal growth factor receptor-positive (HER2+) group (86.5% in the ER+/HER2+, 83.0% in the ER-/HER2-, and 64.7% in the ER+/HER2- groups). The PPV for residual in situ component was as low as 72.2%. CONCLUSION: Our results have shown that MRI combined with second-look US in predicting for a pCR was useful compared with MRI alone, especially for ER-/HER2+. However, it was difficult to predict for the presence of a residual in situ component. Our ongoing prospective multi-institutional study has shown that adding vacuum-assisted biopsy to MRI plus second-look US is warranted to improve the prediction of pCR for omitting breast surgery.
BACKGROUND: Magnetic resonance imaging (MRI) or ultrasonography (US) alone is limited in the ability to predict the pathologic complete response (pCR) accurately after neoadjuvant chemotherapy (NAC). The aim of the present study was to predict the pCR using MRI combined with second-look US in primary breast cancerpatients. MATERIALS AND METHODS: A total of 1274 consecutive primary breast cancerpatients who were examined by MRI and second-look US before and after NAC and had undergone breast-conserving surgery from 2004 to 2014 were included. The positive predictive value (PPV) of a clinical complete response (cCR) by MRI alone and MRI plus US was assessed. A CR was defined as no residual invasive carcinoma. The presence of a residual in situ component was also assessed (ypTis). RESULTS: Of the 1274 patients, 333 (26.1%) had a pCR (ypT0/is), and 102 (8.0%) had a residual in situ component (ypTis). A cCR was found in 247 patients (19.4%) using MRI alone and in 182 patients (14.3%) using MRI plus US. The PPV for a cCR using MRI alone was 79.4% and the PPV for MRI plus US was 86.8%. The PPV for a cCR by MRI plus US was the greatest at 98.1% in the estrogen receptor-negative (ER-)/humanepidermal growth factor receptor-positive (HER2+) group (86.5% in the ER+/HER2+, 83.0% in the ER-/HER2-, and 64.7% in the ER+/HER2- groups). The PPV for residual in situ component was as low as 72.2%. CONCLUSION: Our results have shown that MRI combined with second-look US in predicting for a pCR was useful compared with MRI alone, especially for ER-/HER2+. However, it was difficult to predict for the presence of a residual in situ component. Our ongoing prospective multi-institutional study has shown that adding vacuum-assisted biopsy to MRI plus second-look US is warranted to improve the prediction of pCR for omitting breast surgery.
Authors: Quing Zhu; Foluso O Ademuyiwa; Catherine Young; Catherine Appleton; Matthew F Covington; Cynthia Ma; Souzan Sanati; Ian S Hagemann; Atahar Mostafa; K M Shihab Uddin; Isabella Grigsby; Ashley E Frith; Leonel F Hernandez-Aya; Steven S Poplack Journal: Breast Cancer Res Treat Date: 2021-05-10 Impact factor: 4.872