Reduced folate carrier protein expression in osteosarcoma: implications for the prediction of tumor chemosensitivity.

Abstract:

BACKGROUND:High-dose methotrexate (MTX) is an important component of current protocols for the treatment of osteosarcoma. Although MTX uptake proceeds primarily through the reduced folate carrier (RFC) protein and efflux occurs via multidrug resistance protein 1 (MRP1), RFC protein expression in osteosarcoma remains unexamined. METHODS:RFC and MRP1 expression (normalized to beta-actin expression) was examined with Western blot analysis in 11 osteosarcoma specimens obtained at diagnosis and 9 osteosarcoma specimens obtained on recurrence. RESULTS:The average RFC level in specimens obtained on recurrence was significantly higher than the level in specimens obtained at diagnosis (P = 0.0005). Furthermore, in all three matched pairs of diagnosis and recurrence specimens, RFC levels were higher in recurrence specimens than in the corresponding diagnosis specimens. Potential correlations between RFC and MRP1 expression and histologic response to preoperative chemotherapy were examined. Tumors with poor histologic responses (i.e.,

journal_name

Cancer

journal_title

Cancer

authors

Ifergan I,Meller I,Issakov J,Assaraf YG

doi

10.1002/cncr.11741

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

1958-66

issue

9

eissn

0008-543X

issn

1097-0142

journal_volume

98

pub_type

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