Abstract
Purpose
To determine whether 18F-FDG uptake in breast cancer correlates with immunohistochemically defined subtype and is able to predict molecular subtypes.
Methods
This retrospective study involved 306 patients with 308 mass-type invasive breast cancers (mean size 2.65 cm, range 1.0–15.0 cm) who underwent 18F-FDG PET/CT before therapy. The correlations between primary tumour 18F-FDG uptake on PET/CT, expressed as SUVmax, and clinicopathological findings and molecular subtype, i.e. luminal A, luminal B (HER2-negative), luminal B (HER2-positive), HER2-positive and triple-negative, were analysed. The predictors of these subtypes were investigated.
Results
The mean SUVmax of the 308 tumours was 5.33 ± 3.63 (range 1.15–19.01). Among the subtypes of the 308 tumours, 87 (28.2 %) were luminal A, 111 (36.0 %) were luminal B (HER2-negative), 31 (10.1 %) were luminal B (HER2-positive), 26 (8.4 %) were HER2-positive and 53 (17.2 %) were triple-negative, and the corresponding mean SUVmax were 3.41 ± 2.07 (range 1.18–14.30), 5.17 ± 3.52 (range 1.35–19.01), 6.57 ± 3.84 (range 1.42–15.58), 7.55 ± 3.63 (range 2.30–13.60) and 6.97 ± 4.17 (range 1.15–16.06), respectively. A cut-off value of 3.60 yielded 70.1 % sensitivity and 66.1 % specificity with an area under the receiver operating characteristics curve (AUC) of 0.734 for predicting that a tumour was of the luminal A subtype. A cut-off value of 6.75 yielded 65.4 % sensitivity and 75.2 % specificity with an AUC of 0.704 for predicting a HER2-positive subtype.
Conclusion
SUVmax, a metabolic semiquantitative parameter, shows a significant correlation with the molecular subtype of breast cancer, and is useful for predicting the luminal A or HER2-positive subtype.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. This was a retrospective study, for which formal consent is not required. This article does not describe any studies with animals performed by any of the authors. This retrospective study was approved by the institutional review board, and the need for patient informed consent was waived.
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Kitajima, K., Fukushima, K., Miyoshi, Y. et al. Association between 18F-FDG uptake and molecular subtype of breast cancer. Eur J Nucl Med Mol Imaging 42, 1371–1377 (2015). https://doi.org/10.1007/s00259-015-3070-1
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DOI: https://doi.org/10.1007/s00259-015-3070-1