Dynamic magnetic resonance imaging of regional contrast access as an additional prognostic factor in pediatric osteosarcoma.

Abstract:

BACKGROUND:The purpose of this article was to evaluate the utility of a pharmacokinetically modeled measure of regional contrast access, based on dynamic contrast-enhanced magnetic resonance imaging (MRI) studies after preoperative chemotherapy, as a predictor of disease free survival in osteosarcoma. METHODS:The kinetic parameters of a two-compartment pharmacokinetic model of MRI contrast agent accumulation were analyzed in relation to disease free survival in 31 patients who received protocol-based therapy for nonmetastatic osteosarcoma of the extremities. The modeled exchange rate of contrast between the plasma and the tumor extravascular extracellular fluid space served as a measure of regional contrast access. The prognostic impact of both the clinically accepted standard of histologic evaluation of tumor necrosis and the regional contrast access were analyzed with tumor size as an influential factor. RESULTS:Although the histologic grade of response was not a statistically significant prognostic factor in these patients (P = 0.884), regional contrast access after preoperative chemotherapy was significantly predictive of disease free survival (P = 0.035) in the Cox proportional hazards model. Lower regional access before surgery and smaller tumor size were associated with a better treatment outcome. Log-rank analyses of Kaplan-Meier curves indicated that the impact of regional access was most pronounced in patients with larger tumors (P = 0.052). Higher regional access at presentation also was associated significantly with greater decreases during therapy. CONCLUSIONS:Dynamic MRI estimates of regional contrast access after preoperative chemotherapy, when combined with tumor size, holds promise for the early identification of patients at risk of recurrence. The availability of such response predictors could facilitate the development of risk-adapted treatment approaches.

journal_name

Cancer

journal_title

Cancer

authors

Reddick WE,Wang S,Xiong X,Glass JO,Wu S,Kaste SC,Pratt CB,Meyer WH,Fletcher BD

subject

Has Abstract

pub_date

2001-06-15 00:00:00

pages

2230-7

issue

12

eissn

0008-543X

issn

1097-0142

pii

10.1002/1097-0142(20010615)91:12<2230::AID-CNCR125

journal_volume

91

pub_type

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