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Clin Oncol (R Coll Radiol). 2010 Dec;22(10):818-27. doi: 10.1016/j.clon.2010.05.021. Epub 2010 Jun 15.

Heterogeneity of metabolic response to systemic therapy in metastatic breast cancer patients.

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  • 1Department of Nuclear Medicine, Institut Jules Bordet, Brussels, Belgium. vhuyge@ulb.ac.be

Abstract

AIM:

The aim of this retrospective study was to describe the intra-individual heterogeneity of the ¹⁸F-labelled fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) response among lesions in bone-dominant metastatic breast cancer patients treated with systemic therapies.

PATIENTS AND METHODS:

The metabolic response was analysed by comparing PET/CT scans carried out before and during a new treatment phase (n=46) in 25 bone-dominant metastatic breast cancer patients. Patients presented both bone and extra-bone metastases in 48% treatment phases. The metabolic response was analysed according to European Organization for Research and Treatment of Cancer (EORTC) criteria. A heterogeneous response was defined as the coexistence of responding and non-responding lesions within the same patient.

RESULTS:

The lesion-based response analysis showed a heterogeneous metabolic response in 48% of treatment phases. In the subset with both bone and extra-bone metastases (n=20), PET/CT showed discordant responses between bone and extra-bone metastases in 6/20 (30%) treatment phases. Considering all the cases included in the study, the time to progression (TTP) was longer in cases with a metabolic response compared with the cases with a metabolic non-response (P=0.02). In cases with a PET/CT non-response, TTP seemed to be lower in those with a homogeneous non-response compared with those with a heterogeneous metabolic response (P=0.07).

CONCLUSION:

Whole-body FDG-PET allows frequent heterogeneous responses after systemic therapy to be identified in bone-dominant metastatic breast cancer patients.

Copyright © 2010 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.

PMID:
20554438
[PubMed - indexed for MEDLINE]
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