Relationship between ornithine decarboxylase levels in anaplastic gliomas and progression-free survival in patients treated with DFMO-PCV chemotherapy.

Abstract:

:The purpose of this study was to assess the relationship between progression-free survival (PFS) in patients treated with DFMO + PCV (procarbazine, CCNU, vincristine) chemotherapy for malignant gliomas with tumor cell ornithine decarboxylase (ODC) activity. Formalin-fixed slides were obtained for study patients with anaplastic gliomas (AGs) and glioblastoma treated on protocol DM92-035. ODC levels were measured using an antibody to ODC coupled to Alexa 647 dye (Ab-ODC-Alexa 647). Ab-ODC-Alexa 647 intensity in transgenic murine hearts of differing ODC activity was used to calculate ODC activity in tumor cell nucleoplasm. In total, tumor specimens for 31 of 114 (27%) patients treated on the AG strata and 10 patients from the GBM strata were obtained. We found that tumor ODC level heterogeneity increased with increasing tumor malignancy. In a Cox proportional hazards model, PFS was found to be inversely related to median tumor ODC activity, with an unadjusted hazard ratio for median ODC group (>3.3 vs. 3.3 nmol/30 min/mug protein. Of AG tumors in which ODC activity was evaluated, 26% had ODC levels > 3.3 nmol/30 min/mug protein. This study shows that Ab-ODC-Alexa 647 fluorescence intensity can be used as a surrogate marker of ODC biochemical activity in AGs and can predict PFS to DFMO-based chemotherapy.

journal_name

Int J Cancer

authors

Levin VA,Jochec JL,Shantz LM,Aldape KD

doi

10.1002/ijc.22914

subject

Has Abstract

pub_date

2007-11-15 00:00:00

pages

2279-83

issue

10

eissn

0020-7136

issn

1097-0215

journal_volume

121

pub_type

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