Abstract
Background
Emerging evidence has shown activation of the complement system in cancer tissues and anaphylatoxin C5a release from C5 by cancer cells, suggesting C5a as a component in the cancer microenvironment. We revealed aberrant expression of C5a receptor (C5aR) in various human cancers and C5a-elicited enhancement of C5aR-expressing cancer cell invasion.
Methods
To explore an influence of the C5a–C5aR system in breast cancer (BC), we investigated BC C5aR expression in relation to clinicopathological parameters of the patients and an effect of C5a on BC cell proliferation.
Results
BC cell C5aR expression was observed immunohistochemically in 22 of 171 patients (13 %) and related to larger tumor size, higher nuclear grade and Ki-67 labeling index, presence of lymph node metastasis and advanced clinical stages. Interestingly, BC cells were C5aR-negative in all patients with BC in situ and C5aR-positive rate was high (38 %) in patients with hormone receptor-negative, namely triple-negative BC. For BC cells in metastasized lymph nodes, 12 of 22 patients (55 %) were C5aR-positive and included 7 patients with C5aR-negative BC in the primary site. Survival rate of patients with C5aR-positive BC was lower than that of patients with C5aR-negative BC. C5a enhanced proliferation of C5aR-expressing triple-negative BC cells in a C5aR-dependent manner.
Conclusion
Relation of BC C5aR expression to tumor development and poor prognosis of the patients and proliferation enhancing effect of C5a on C5aR-expressing BC cells suggest that the C5a–C5aR system is closely associated with BC progression. This system may be a new target to treat BC patients, particularly with triple-negative BC.
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Abbreviations
- BC:
-
Breast cancer
- C5:
-
The fifth complement component
- C5aR:
-
C5a-receptor
- TNBC:
-
Triple-negative breast cancer
- RFS:
-
Relapse-free survival
- DRFS:
-
Distant relapse-free survival
- BCSS:
-
Breast cancer-specific survival
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Acknowledgments
We thank Miss. Chisato Takagi, Yuki Teramoto, and Chihiro Murakami, Shokei University, Kumamoto, for their technical assistance. This work was supported in part by Japanese Science Progress Society KAKENHI Grants 22590363 and 25460498 to Takahisa Imamura and 25461982 to Toru Kariu.
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Imamura, T., Yamamoto-Ibusuki, M., Sueta, A. et al. Influence of the C5a–C5a receptor system on breast cancer progression and patient prognosis. Breast Cancer 23, 876–885 (2016). https://doi.org/10.1007/s12282-015-0654-3
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DOI: https://doi.org/10.1007/s12282-015-0654-3