68Ga-PSMA-11 PET imaging of response to androgen receptor inhibition: first human experience

The purpose of this work was to evaluate the effect of androgen receptor (AR) inhibition on prostate-specific membrane antigen (PSMA) uptake imaged using 68Ga-PSMA-11 PET in a mouse xenograft model and in a patient with castration-sensitive prostate cancer. Methods: We imaged 3 groups of 4 mice bear...

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Main Authors: Hope, Thomas A. (Author) , Afshar-Oromieh, Ali (Author)
Format: Article (Journal)
Language:English
Published: 2017
In: Journal of nuclear medicine
Year: 2016, Volume: 58, Issue: 1, Pages: 81-84
ISSN:2159-662X
DOI:10.2967/jnumed.116.181800
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.2967/jnumed.116.181800
Verlag, kostenfrei, Volltext: http://jnm.snmjournals.org/content/58/1/81
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Author Notes:Thomas A. Hope, Charles Truillet, Eric C. Ehman, Ali Afshar-Oromieh, Rahul Aggarwal, Charles J. Ryan, Peter R. Carroll, Eric J. Small, Michael J. Evans

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520 |a The purpose of this work was to evaluate the effect of androgen receptor (AR) inhibition on prostate-specific membrane antigen (PSMA) uptake imaged using 68Ga-PSMA-11 PET in a mouse xenograft model and in a patient with castration-sensitive prostate cancer. Methods: We imaged 3 groups of 4 mice bearing LNCaP-AR xenografts before and 7 d after treatment with ARN-509, orchiectomy, or control vehicle. Additionally, we imaged one patient with castration-sensitive prostate cancer before and 4 wk after treatment with androgen deprivation therapy (ADT). Uptake on pre- and posttreatment imaging was measured and compared. Results: PSMA uptake increased 1.5- to 2.0-fold in the xenograft mouse model after treatment with both orchiectomy and ARN-509 but not with vehicle. Patient imaging demonstrated a 7-fold increase in PSMA uptake after the initiation of ADT. Thirteen of 22 lesions in the imaged patient were visualized on PSMA PET only after treatment with ADT. Conclusion: Inhibition of the AR can increase PSMA expression in prostate cancer metastases and increase the number of lesions visualized using PSMA PET. The effect seen in cell and animal models can be recapitulated in humans. A better understanding of the temporal changes in PSMA expression is needed to leverage this effect for both improved diagnosis and improved therapy. 
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