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Abnormal T regulatory cells (Tregs: FOXP3+, CTLA-4+), myeloid-derived suppressor cells (MDSCs: monocytic, granulocytic) and polarised T helper cell profiles (Th1, Th2, Th17) in women with large and locally advanced breast cancers undergoing neoadjuvant chemotherapy (NAC) and surgery: failure of abolition of abnormal treg profile with treatment and correlation of treg levels with pathological response to NAC

Chandan Verma1*, Jennifer M Eremin2, Adrian Robins3, Andrew J Bennett4, Gerard P Cowley5, Mohamed A El-Sheemy26, Jibril A Jibril2 and Oleg Eremin12

Author Affiliations

1 Division of Gastrointestinal Surgery, University of Nottingham, E Floor West Block, Queens Medical Centre, Derby Road, Nottingham, NG7 2UH, UK

2 Research & Development Department, Lincoln Breast Unit, Lincoln County Hospital, Greetwell Road, Lincoln, LN2 5QY, UK

3 School of Molecular Medical Sciences, A Floor West Block, Queens Medical Centre, Derby Road, Nottingham, NG7 2UH, UK

4 FRAME Laboratory, School of Biomedical Sciences, University of Nottingham Medical School, Queens Medical Centre, Derby Road, Nottingham, NG7 2UH, UK

5 Department of Pathology, PathLinks, Lincoln County Hospital, Greetwell Road, Lincoln L, N2 5QY, UK

6 School of Life Sciences, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK

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Journal of Translational Medicine 2013, 11:16  doi:10.1186/1479-5876-11-16

Published: 15 January 2013

Abstract

Background

Host defences play a key role in tumour growth. Some of the benefits of chemotherapy may occur through modulation of these defences. The aim of this study was to define the status of regulatory cells in women with large and locally advanced breast cancers (LLABCs) undergoing neoadjuvant chemotherapy (NAC) and surgery.

Methods

Bloods were collected from patients (n = 56) before, during and following NAC, and surgery. Controls (n = 10) were healthy, age-matched females donors (HFDs). Blood mononuclear cells (BMCs) were isolated and T regulatory cells (Tregs) (n = 31) determined. Absolute numbers (AbNs) of Tregs and myeloid-derived suppressor cells (MDSCs) were ascertained from whole blood (n = 25). Reverse transcriptase polymerase chain reaction analysis determined Treg mRNA (n = 16). In vitro production of Th1, Th2 and Th17 cytokines (n = 30), was documented. Patients were classified as clinical responders by magnetic resonance mammography after two cycles of NAC and as pathological responders using established criteria, following surgery.

Results

Patients with LLABCs had significantly increased circulating Tregs (≥ 6 fold AbN and percentage (%)) and MDSCs (≥ 1.5 fold AbN (p = 0.025)). Percentage of FOXP3+ Tregs in blood predicted the response of the LLABCs to subsequent NAC (p = 0.04). Post NAC blood Tregs (%) were significantly reduced in patients where tumours showed a good pathological response to NAC (p = 0.05). Blood MDSCs (granulocytic, monocytic) were significantly reduced in all patients, irrespective of the pathological tumour response to chemotherapy. NAC followed by surgery failed to restore blood Tregs to normal levels. MDSCs, however, were reduced to or below normal levels by NAC alone. Invitro Th1 profile (IL-1β, IL-2, INF-γ, TNF-α) was significantly reduced (p ≤ 0.009), whilst Th2 (IL-4, IL-5) was significantly enhanced (P ≤ 0.004). Th1 and Th2 (IL-5) were unaffected by NAC and surgery. IL-17A was significantly increased (p ≤ 0.023) but unaffected by chemotherapy and surgery.

Conclusion

Women with LLABCs have abnormal blood regulatory cell levels (Tregs and MDSCs) and cytokine profiles (Th1, Th2, Th17). NAC followed by surgery failed to abolish the abnormal Treg and Th profiles. There was a significant correlation between the circulatory levels of Tregs and the pathological response of the breast cancers to NAC.

Keywords:
Breast cancer; Tregs; Myeloid-derived suppressor cells; Cytokines; Chemotherapy and surgery