Thymidylate synthase expression in oral squamous cell carcinoma predicts response to S-1

  • Authors:
    • Koji Harada
    • Yuichiro Kawashima
    • Hideo Yoshida
    • Mitsunobu Sato
  • View Affiliations

  • Published online on: June 1, 2006     https://doi.org/10.3892/or.15.6.1417
  • Pages: 1417-1423
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Abstract

The purpose of this research was to evaluate the predictive value of expression of thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD), thymidine phosphorylase (TP), or orotate phosphoribosyltransferase (OPRT) genes for response to S-1. Twenty-five patients with oral squamous cell carcinoma (OSCC) received S-1 80 mg/m2/day. Pretreatment tumor biopsies were analyzed for TS, DPD, TP or OPRT mRNA expression by real-time reverse transcription-PCR. TS protein expression was evaluated by immunohistochemistry using a polyclonal TS antibody. Twenty-five patients were evaluable for response and gene expression. Six of the 25 (24%) achieved complete remission and 4 of the 25 (16%) had a partial response. Median TS/β-actin was 2.51 (range 0.98-7.07). Median TS/β-actin was 1.26 in responding patients and 3.43 in non-responders (P=0.0001). Ten of 11 patients with TS/β-actin <1.80 and 0 of 15 with higher values responded (P<0.0001). Overall survival was 29.7 months in patients with TS/β-actin <1.80 and 41.7 months in patients with higher values (P=0.0013). No correlations were seen between expression of DPD, TP or OPRT mRNA and response or survival. Weak TS staining was seen in 6 of 25 tumors evaluable for immunohistochemistry, including 5 responders. All 4 of the patients with both weak staining and TS/β-actin <1.80 responded. High TS mRNA expression predicts non-response to S-1. On the other hand, high levels of DPD or TP mRNA and low levels of OPRT mRNA are not associated with S-1 resistance. TS mRNA expression is considered to be a useful prognostic factor in OSCC patients with S-1 single-agent therapy.

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June 2006
Volume 15 Issue 6

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Harada K, Kawashima Y, Yoshida H and Sato M: Thymidylate synthase expression in oral squamous cell carcinoma predicts response to S-1. Oncol Rep 15: 1417-1423, 2006
APA
Harada, K., Kawashima, Y., Yoshida, H., & Sato, M. (2006). Thymidylate synthase expression in oral squamous cell carcinoma predicts response to S-1. Oncology Reports, 15, 1417-1423. https://doi.org/10.3892/or.15.6.1417
MLA
Harada, K., Kawashima, Y., Yoshida, H., Sato, M."Thymidylate synthase expression in oral squamous cell carcinoma predicts response to S-1". Oncology Reports 15.6 (2006): 1417-1423.
Chicago
Harada, K., Kawashima, Y., Yoshida, H., Sato, M."Thymidylate synthase expression in oral squamous cell carcinoma predicts response to S-1". Oncology Reports 15, no. 6 (2006): 1417-1423. https://doi.org/10.3892/or.15.6.1417