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01.03.2012 | Original article | Ausgabe 3/2012

Cancer Immunology, Immunotherapy 3/2012

Metronomic cyclophosphamide treatment in metastasized breast cancer patients: immunological effects and clinical outcome

Zeitschrift:
Cancer Immunology, Immunotherapy > Ausgabe 3/2012
Autoren:
Yingzi Ge, Christoph Domschke, Natalija Stoiber, Sarah Schott, Joerg Heil, Joachim Rom, Maria Blumenstein, Janina Thum, Christof Sohn, Andreas Schneeweiss, Philipp Beckhove, Florian Schuetz
Wichtige Hinweise
Y. Ge and C. Domschke contributed equally.

Abstract

Severe immune suppression is frequent in late-stage tumor patients and promotes tumor immune evasion and subsequent tumor progression. Regulatory T cells (Treg) are major suppressors of anti-tumor immune responses. Therefore, targeting of Treg has become a key goal of anti-tumor therapy. Several preclinical and clinical observations suggest that Treg can be depleted by cyclophosphamide. Over a period of 3 months, we investigated the effect of metronomic low-dose cyclophosphamide on Treg numbers, suppressive capacity and proliferation on endogenous anti-tumor T-cell responses and on their correlation to clinical outcome in 12 patients with treatment-refractory metastasized breast cancer who received single-agent 50 mg cyclophosphamide p.o. daily. Cyclophosphamide treatment initially caused a significant reduction in circulating Treg by more than 40% (P = 0.002). However, Treg numbers completely recovered during the treatment due to increased proliferative activity and maintained their suppressive capacity. Treg depletion coincided with a strong increase in breast tumor–reactive T cells (P = 0.03) that remained at high levels during the whole period. Numbers of tumor-reactive T cells but not of Treg correlated with disease stabilization (P = 0.03) and overall survival (P = 0.027). We conclude that metronomic low-dose cyclophosphamide only transiently reduces Treg but induces stable tumor-specific T-cell responses, which correlate with improved clinical outcome in advanced-stage breast cancer patients.

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