P-glycoprotein expression in canine lymphoma: a relevant, intermediate model of multidrug resistance.

Abstract:

BACKGROUND:Despite extensive investigation, the role of MDR of human cancer remains unclear. Canine lymphoma is a spontaneously arising correlate of human non-Hodgkin's lymphoma that may complement other in vivo models for investigation of issues related to MDR. METHODS:Immunoreactivity of primary antibodies to the human MDR1 gene product, p-glycoprotein 170 (Pgp), were determined in both a retrospective (n=76) and prospective (n=15) survey of canine lymphoma. Known prognostic factors and response to chemotherapy were correlated with categorical designations of Pgp expression. RESULTS:When combined, 61 of 91 samples (67%) were negative for Pgp, 16 of 91 (17.5%) had strong Pgp immunoreactivity in >50% of the malignant population and 14 of 91 (15.5%) had Pgp reactivity in 10-50% of cells. Pgp expression was greater after relapse compared with pretreatment samples [C494 83% vs. 25%; P=0.012 and C219 73% vs. 27%; P=0.04]. Pretreatment Pgp expression was an independent negative predictor of overall survival (median=225d vs. 367d; P=0.02). CONCLUSIONS:Pgp expression in spontaneous canine lymphoma is similar to that reported in human non-Hodgkin's lymphoma. Use of this model may expedite investigation of novel strategies for MDR prevention or modulation.

journal_name

Cancer

journal_title

Cancer

authors

Lee JJ,Hughes CS,Fine RL,Page RL

doi

10.1002/(SICI)1097-0142(19960501)77:9<1892::AID-CN

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

1892-8

issue

9

eissn

0008-543X

issn

1097-0142

pii

10.1002/(SICI)1097-0142(19960501)77:9<1892::AID-CN

journal_volume

77

pub_type

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