Abstract 5795
Background
AR-inhibition with Enzalutamide may be an attractive alternative for 1L treatment of men with hormone-sensitive prostate cancer compared to androgen deprivation therapy (ADT). There is an unmet need for robust, reproducible imaging technology allowing accurate quantification and qualification of bone plus soft tissue metastases and assessment of early tumour responses to novel agents. PET/CT or WB MRI imaging offer advantage over traditional bone and CT scans.
Methods
Sixty patients with metastatic hormone-sensitive PC were included in this prospective cohort study. Patients received Enzalutamide 160 mg once daily until progression of disease. Imaging tests were performed at baseline and bone scintigraphy and CT repeated at 3 month intervals, 18F-choline PET/CT at 2 weeks, 2, 6, 9 and 12 months and WB-MRI at 6 and 12 months. Enumeration of circulating tumor cells and quality of life assessments were secondary outcomes.
Results
Sixty patients with a median age of 72 yrs (range 57 − 85) and a median PSA of 62.8 μg/L (range 3-622) were enrolled. This study is ongoing; all of the first 50 patients experienced a ≥ 50% PSA decline and 49 a ≥ 90% PSA decline. Choline-PET imaging and WB MRI were more frequently able to detect metastases and measure favorable responses than bone scan or CT thorax and abdomen. Investigator and central review of all imaging results are ongoing. Treatment was well tolerated.
Conclusions
18F-choline PET/CT and WB-MRI were superior in detection of bone and lymph node metastases and 18F-choline PET/CT was useful for early response detection already at 2 weeks. Based on results both 18F-choline-PET and WB MRI imaging have great clinical utility in aiding clinicians treating men with hormone-sensitive metastatic prostate cancer.
Clinical trial identification
NCT02815033.
Editorial acknowledgement
Legal entity responsible for the study
European Uro-Oncology Group (EUOG).
Funding
Astellas Pharma.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
1500 - Retrospective evaluation of neutropenic admission events in metastatic or high-risk hormone-sensitive prostate cancer (HSPC) patients having docetaxel chemotherapy upfront or for castrate-resistant prostate cancer (CRPC) in STAMPEDE
Presenter: Harriet Mintz
Session: Poster Display session 3
Resources:
Abstract
3524 - Cabazitaxel For Octogenarian Patients With Metastatic Castration-Resistant Prostate Cancer (MCRPC).
Presenter: Paolo Tralongo
Session: Poster Display session 3
Resources:
Abstract
5637 - External Validation of a Prognostic Score in First-Line Metastastic Castration-Resistant Prostate Cancer (mCRPC)
Presenter: David Lorente
Session: Poster Display session 3
Resources:
Abstract
3228 - Treatment outcomes of 3rd treatment in a real-world metastatic castration resistant prostate cancer (mCRPC) population: results from the Dutch CAPRI-registry
Presenter: Jessica Notohardjo
Session: Poster Display session 3
Resources:
Abstract
4695 - Pelvic lymph node dissection and its extent on survival benefit in prostate cancer patients with a risk of lymph node invasion>5%: a propensity score matching analysis from SEER database
Presenter: Junru Chen
Session: Poster Display session 3
Resources:
Abstract
4438 - Multi-institutional evaluation of therapeutic management for oligometastatic cancer prostate recurrence with choline-PET/CT
Presenter: Morgane Guibert-broudic
Session: Poster Display session 3
Resources:
Abstract
4574 - Safety of new androgen receptor inhibitors (ARi) in patients with nonmetastatic castration-resistant prostate cancer (nmCRPC): a network meta-analysis of randomized controlled trials (RCT)
Presenter: Amelia Altavilla
Session: Poster Display session 3
Resources:
Abstract
3816 - Real-world use of radium-223 for treatment of metastatic castration resistant-prostate cancer (mCRPC): results from the Dutch CAPRI registry
Presenter: Malou Kuppen
Session: Poster Display session 3
Resources:
Abstract
5180 - A phase 2a study of radium-223 dichloride (Ra-223) alone or in combination with abiraterone acetate or enzalutamide in metastatic castration-resistant prostate cancer (mCRPC)
Presenter: Daniel Petrylak
Session: Poster Display session 3
Resources:
Abstract
1067 - Adding ADT to PSMA-PET/CT-guided SBRT for oligometastatic prostate cancer improves distant progression-free survival
Presenter: Carole Mercier
Session: Poster Display session 3
Resources:
Abstract