Breast Cancer

, Volume 25, Issue 6, pp 706–716 | Cite as

Breast cancer stem cells characterized by CD70 expression preferentially metastasize to the lungs

  • Li Liu
  • Bo Yin
  • Zhu Yi
  • XiuJuan Liu
  • ZhiQian Hu
  • WenChao Gao
  • HaiWen YuEmail author
  • QingQuan LiEmail author
Original Article



Cancer stem cells (CSCs) are believed to form metastases. We sought to determine whether CD70 + subpopulation in human breast cancers represents the CSCs accounting for distant metastasis.


We measured the expression levels of CD70 in breast cancer cell lines and 122 primary breast cancer samples. We characterized the functional roles of CD70 + subpopulation in distant metastasis of breast cancers.


We observed a distinct pattern of CD70 expression in a panel of primary breast carcinoma samples, indicating that CD70 serves as a biomarker of lung-specific metastasis. CD70− and CD70+ cell populations isolated from breast cancer cell lines exhibited epithelial and mesenchymal phenotypes, respectively. CD70+ cells, but not CD70− cells, possessed self-renewal and differentiation potentials. Tumorsphere formation in suspension cultures and in vivo tumorigenicity were significantly greater in CD70+ cells than in CD70− cells. Furthermore, the development of lung metastases induced by orthotopic injection was markedly increased in mice inoculated with CD70 + cells. CD70 contributed to the promotion of lung metastases by enhancing self-renewal potential of CD70 + cells.


We isolated CSCs from primary human breast cancers and found that CD70 + subpopulations mediate lung-specific metastasis. These findings might be used to aid in selection of patients for postoperative adjuvant therapy.


CD70 Lung metastasis Breast carcinoma Cancer stem cells Self-renewal 



This work was supported by grants from the National Nature Science Foundation of China (81372350, 81172099, 81572886 and 81501435).

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Supplementary material

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Copyright information

© The Japanese Breast Cancer Society 2018

Authors and Affiliations

  1. 1.Department of RadiologyFudan University Shanghai Cancer CenterShanghaiChina
  2. 2.Department of Oncology, Shanghai Medical CollegeFudan UniversityShanghaiChina
  3. 3.Department of Radiology, HuaShan HospitalFudan UniversityShanghaiChina
  4. 4.Department of Radiation Oncology, Eye and Ent HospitalFudan UniversityShanghaiChina
  5. 5.Department of Pathology, School of Basic Medical SciencesFudan UniversityShanghaiChina
  6. 6.Department of General Surgery, ChangZheng HospitalSecond Military Medical UniversityShanghaiChina
  7. 7.Department of SurgeryJiading Nanxiang HospitalShanghaiChina

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