Thymidylate synthase: a critical target for cancer chemotherapy.

Abstract:

:Thymidylate synthase (TS) is a key enzyme in the synthesis of 2'-deoxythymidine-5'-monophosphate, an essential precursor for DNA biosynthesis. For this reason, this enzyme is a critical target in cancer chemotherapy. As the first TS inhibitor in clinical use, 5-fluorouracil (5-FU) remains widely used for the treatment of colorectal, pancreatic, breast, head and neck, gastric, and ovarian cancers. The reduced folate, leucovorin, has been shown to enhance the activity of 5-FU in colorectal cancer. However, response rates of the combination remain in the 25%-30% range, and much effort has been focused on designing new, more potent TS inhibitors. Raltitrexed is a folate analogue that is approved as first-line therapy for advanced colorectal cancer in Europe, Australia, Canada, and Japan, although it remains an investigational agent in the United States. Pemetrexed is an antifolate analogue that has shown promising activity in several solid tumor types, including mesothelioma. ZD9331, a highly specific TS inhibitor that dose not require polyglutamation for its activation, has shown activity in patients with refractory ovarian and colorectal cancer. Capecitabine is an oral fluoropyrimidine carbamate that was designed to generate 5-FU preferentially in tumor cells; this agent was recently approved by the US Food and Drug Administration as first-line therapy for patients with advanced colorectal cancer. As the number of TS inhibitors available for general clinical use increases, further research is needed to elucidate the critical molecular and biochemical elements that determine the efficacy and tumor specificity of each compound.

journal_name

Clin Colorectal Cancer

authors

Rose MG,Farrell MP,Schmitz JC

doi

10.3816/CCC.2002.n.003

keywords:

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

220-9

issue

4

eissn

1533-0028

issn

1938-0674

pii

S1533-0028(11)70490-X

journal_volume

1

pub_type

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