CD4 and cancer: Numbers of CD4+, CD8+ and Foxp3+ T lymphocytes in the invasive front of cancer stroma ranged between 2 and 384/4 high-powered fields (HPF) (median, 77/4 HPF; interquartile range, 32–136/4 HPF), between 1 and 212/4 HPF (median, 52/4 HPF; interquartile range, 26–97/4 HPF) and between 0 and 465/4 HPF (median, 9/4 HPF; interquartile range, 2–21/4 HPF), respectively.