Patterns of distant metastasis in Chinese women according to breast cancer subtypes
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San-Gang Wu1,*, Jia-Yuan Sun2,*, Li-Chao Yang3,*, Li-Ying Tang4, Xue Wang4, Xue-Ting Chen4, Gui-Hua Liu5, Huan-Xin Lin2, Qin Lin1, Zhen-Yu He2
1Department of Radiation Oncology, The First Affiliated Hospital of Xiamen University, Xiamen 361003, People’s Republic of China
2Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Department of Radiation Oncology, Collaborative Innovation Center of Cancer Medicine, Guangzhou 510060, People’s Republic of China
3Department of Basic Medical Science, Medical College, Xiamen University, Xiamen 361005, People’s Republic of China
4Eye Institute of Xiamen University, Fujian Provincial Key Laboratory of Ophthalmology and Visual Science, Medical College, Xiamen University, Xiamen 361005, People’s Republic of China
5School of Pharmaceutical Sciences, Xiamen University, Xiamen 361005, People’s Republic of China
*These authors have contributed equally to this work
Qin Lin, email: [email protected]
Zhen-Yu He, email: [email protected]
Keywords: breast cancer, breast cancer subtype, distant metastasis, patterns
Received: December 25, 2015 Accepted: May 20, 2016 Published: June 16, 2016
To access possible relationships between breast cancer subtypes (BCS) and patterns of distant metastasis in advanced breast cancer. Breast cancer patients with distant metastasis at two academic centers from 2000-2015 were retrospectively reviewed. The breast cancer was classified into four subtypes: hormone receptor (HR) +/ human epidermal growth factor receptor 2 (HER2) − (i.e., estrogen receptor [ER] + and/or progesterone receptor [PR] +, HER2−); HR+/HER2+ (ER+ and/or PR+, HER2+), HR−/HER2+ (ER− and PR−, and HER2+); and HR−/HER2− (ER− and PR−, and HER2−). A total of 679 patients were identified. The distribution of the BCS was 39.9% (271/679), 23.7% (161/679), 16.8% (114/679), and 19.6% (133/679) in HR+/HER2−, HR+/HER2+, HR−/HER2+, and HR−/HER2−, respectively. Patients with HR+/HER2+ and HR−/HER2+ subtypes were prone to abdominal and pelvic metastasis, those with HR+/HER2− and HR+/HER2+ subtypes were prone to bone metastasis, while patients with the HR−/HER2− subtype were prone to lung/mediastinal and brain metastases. In patients with pleural, axillary and/or neck lymph node, and other distant soft tissue metastases, there was no significant difference in metastatic patterns among the BCS. There are different patterns of distant metastasis associated with different BCS. There should be a different focus in the postoperative follow-up and monitoring of breast cancer patients with different BCS.
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