Increased infiltration of CCR4-positive regulatory T cells in prostate cancer tissue is associated with a poor prognosis. - Watanabe M; Kanao K; Suzuki S; Muramatsu H; Morinaga S; Kajikawa K; Kobayashi I; Nishikawa G; Kato Y; Zennami K; Nakamura K; Tsuzuki T; et al. (The Prostate, 2019)