Low-dose docetaxel enhances the sensitivity of S-1 in a xenograft model of human castration resistant prostate cancer

Masanori Hasegawa, Akira Miyajima, Takeo Kosaka, Yota Yasumizu, Nobuyuki Tanaka, Takahiro Maeda, Suguru Shirotake, Hiroki Ide, Eiji Kikuchi, Mototsugu Oya

研究成果: Article

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S-1 is a recently developed dihydropyrimidine dehydrogenase inhibitor fluoropyrimidine and has demonstrated high maximum plasma 5-Fluorouracil (5-FU) levels with mild toxicity, and an oral formulation has resulted in an improvement in patient quality of life. The aims of the present study were to determine the efficacy of S-1 or S-1 combined with docetaxel (DOC) using castration resistant prostate cancer (CRPC) cells and to explore their clinical potential for treating CRPC patients. LNCaP cells, androgen dependent prostate cancer (ADPC) cells and C4-2 cells, which are a CRPC subline of LNCaP cells, were used. Specimens obtained from ADPC and CRPC patients were also evaluated. The CRPC specimens and C4-2 cells exhibited significantly lower thymidylate synthase (TS) expression, a target of 5-FU, than the ADPC specimens and LNCaP cells. In vitro, C4-2 cells exhibited higher sensitivity to 5-FU than LNCaP cells. In C4-2 xenograft model, S-1 monotherapy suppressed tumor growth and low-dose DOC enhanced the anti-tumor effect of S-1. In vitro, low-dose DOC, which did not induce G2/M arrest, increased p53 and p21 and resulted in down-regulation of TS in C4-2 cells, and down-regulation of TS is considered to be responsible for the synergistic effect of S-1 in vivo. The present findings indicate that CRPC patients with androgen ablation may be good candidates for 5-FU based chemotherapy, and these regimens have attractive therapeutic potential for clinical practice, and they may have a significant impact on therapeutic options.

元の言語English
ページ(範囲)431-442
ページ数12
ジャーナルInternational Journal of Cancer
130
発行部数2
DOI
出版物ステータスPublished - 2012 1 15

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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