Expression of the high-affinity fluoropyrimidine-preferring nucleoside transporter hCNT1 correlates with decreased disease-free survival in breast cancer.

Abstract:

PURPOSE:Nucleoside and nucleobase derivatives are currently used in the treatment of a variety of solid tumors; however, the role of plasma membrane transporters as biomarkers of drug metabolism has not been fully addressed. Thus, the purpose of this study was to determine whether the concentrative nucleoside transporter hCNT1 is a predictive marker of therapeutic response. METHODS:We studied a cohort of 90 breast cancer patients who were treated with cyclophosphamide-methotrexate-5-fluorouracil after surgery and then monitored for up to 108 months. hCNT1 and enzymes associated with nucleotide metabolism (thymidine phosphorylase, dihydropyrimidine dehydrogenase and thymidylate synthase) were assessed immunohistochemically in tissue samples. RESULTS:Human CNT1 presence was mostly cytoplasmic, with some nuclear staining. The percentage of hCNT1-positive cells correlated positively with the expression of thymidine phosphorylase and dihydropyrimidine dehydrogenase. Nuclear staining correlated negatively with decreased disease-free survival, whereas the percentage of hCNT1-positive cells correlated positively with reduced long-term survival, with the hCNT1-positive index (>80%) being indicative of poor prognosis. A relative risk of relapse was associated with high hCNT1-positive indexes, whereas when this parameter was combined with the nodal status (positive), a high risk of relapse was found, suggesting that both parameters may reflect a poor prognosis. CONCLUSIONS:These results indicate that the expression of the high-affinity concentrative nucleoside transporter hCNT1 has a prognostic value in determining disease-free survival and risk of relapse in breast cancer patients undergoing surgery followed by cyclophosphamide-methotrexate-5-fluorouracil chemotherapy.

journal_name

Oncology

journal_title

Oncology

authors

Gloeckner-Hofmann K,Guillén-Gómez E,Schmidtgen C,Porstmann R,Ziegler R,Stoss O,Casado FJ,Rüschoff J,Pastor-Anglada M

doi

10.1159/000094541

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

238-44

issue

3

eissn

0030-2414

issn

1423-0232

pii

94541

journal_volume

70

pub_type

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