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Br J Cancer. 2013 Jan 15;108(1):155-62. doi: 10.1038/bjc.2012.524. Epub 2012 Nov 20.

Tumour-infiltrating FOXP3(+) lymphocytes are associated with cytotoxic immune responses and good clinical outcome in oestrogen receptor-negative breast cancer.

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Trev & Joyce Deeley Research Centre, British Columbia Cancer Agency, 2410 Lee Avenue, Victoria, BC V8R 6V5, Canada.



Regulatory T cells (Tregs) are commonly identified by expression of the transcription factor FOXP3 and are conventionally thought to promote cancer progression by suppressing anti-tumour immune responses. We examined the relationship between FOXP3(+) tumour-infiltrating lymphocytes (TIL) and prognosis in oestrogen receptor (ER)-negative breast cancer, a tumour subtype with poor clinical outcome in which TIL are abundant.


FOXP3(+) and CD8(+) TIL were assessed by immunohistochemistry in a cohort of 175 ER- breast tumours. Results were confirmed in an independent data set of 78 ER- breast tumours with publically available gene expression data.


High FOXP3(+) TIL levels were strongly associated with prolonged recurrence-free survival (HR=0.461, P=0.0002), particularly among basal-like tumours (HR=0.280, P=0.0001), for which FOXP3 status was independent of standard prognostic factors. Over 75% of FOXP3(+) TIL in triple negative breast tumours displayed a conventional CD4(+)CD25(+) Treg phenotype. Importantly, FOXP3(+) TIL were positively correlated with CD8(+) (cytotoxic) T cells (r(s)=0.76, P<0.0001), and were prognostically insignificant in tumours with low levels of CD8(+) TIL. These observations were confirmed in an independent cohort.


In contrast with current dogma, we show for the first time that FOXP3(+) TIL are associated with robust anti-tumour immunity and favourable prognosis in ER- breast cancer.

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