Tumor size as a predictor of outcome in pediatric non-metastatic osteosarcoma of the extremity.

Abstract:

BACKGROUND:Better predictors of outcome would allow improved risk-adapted therapy for pediatric nonmetastatic osteosarcoma of the extremity. We investigated the predictive value of MR imaging-based measures of absolute and relative tumor size and volume at the time of diagnosis. We also assessed the relation of tumor size to age and histologic response. METHODS:We retrospectively abstracted demographic, treatment history, and outcome information of patients treated on a single institutional protocol. A single pediatric oncologic radiologist manually measured each primary lesion and the affected native bone in three dimensions on MR images obtained at the time of diagnosis. Eight parameters of tumor size were analyzed for their value in predicting overall survival (OS) and event-free survival (EFS). RESULTS:The median age of the 42 patients was 13.5 years (range: 5.9-18.7 years); 50% were female and 74% were Caucasian. Absolute tumor volume was an important predictor of OS (P < 0.05); absolute tumor depth (analyzed as a continuous variable) was a significant predictor of OS (P = 0.018) and EFS (P = 0.036). Relative measures of tumor size were not found to predict outcome. No relation was seen between tumor size and histologic response. CONCLUSIONS:Absolute tumor size at the time of diagnosis is significantly predictive of OS and EFS. If validated in a larger study, this indicator should be used in the design of risk-adapted treatment protocols for osteosarcoma.

journal_name

Pediatr Blood Cancer

journal_title

Pediatric blood & cancer

authors

Kaste SC,Liu T,Billups CA,Daw NC,Pratt CB,Meyer WH

doi

10.1002/pbc.20077

keywords:

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

723-8

issue

7

eissn

1545-5009

issn

1545-5017

journal_volume

43

pub_type

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