Journal
BRITISH JOURNAL OF CANCER
Volume 98, Issue 1, Pages 148-153Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.bjc.6604149
Keywords
Foxp3; regulatory T cells; gastric cancer; prognosis
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It has been reported that the population of regulatory T cells ( T regs) is increased in tumour-infiltrating lymphocytes in cancer-bearing hosts. Recently, forkhead/winged helix transcription factor p3, Foxp3, is thought to be the most reliable marker of T regs. In the present study, we investigated the prevalence and localisation pattern of Foxp3(+) cells in gastric cancer ( n = 80) by immunohistochemistry, in relation to the clinical outcome of gastric cancer patients. Immunohistochemical staining was performed with anti-Foxp3 mAb, and Foxp3(+) cells were semiquantified. We divided all cases into two groups: Foxp3(+)-high ( n = 40) and Foxp3(+)-low ( n = 40) groups, by the median size of the population of Foxp3(+) cells. Furthermore, in terms of the localisation pattern of accumulating Foxp3(+) cells in tumours, we classified all cases into three groups: a peri-tumour group ( n = 30), a diffuse group ( n = 40), and a follicular group ( n = 10). As a result, although the populations of Foxp3(+) cells in stage IV were significantly larger than those in stage I ( P < 0.05), there was no significant difference in survival between the patients with high and low population levels of Foxp3(+) cells. However, survival in patients with a diffuse pattern of Foxp3(+) cells was significantly poorer than in those with a peritumoral pattern. In conclusion, the localisation pattern, but not the population size, of Foxp3(+) cells was significantly related to patient survival.
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