(UroToday.com) Dr. Boike and colleagues presented early outcomes from lutetium Lu-177 vipivotide tetraxetan treatment in patients selected for therapy with piflufolastat F-18 PET imaging. The authors note that the VISION trial1 utilized Ga 68 PSMA imaging to select patients for treatment with Lutetium Lu 177 Vipivotide Tetraxetan radioligand therapy. However, they note that current guidelines allow not only Ga 68 PSMA 11 PET but also Piflufolastat F 18 PET when selecting patients for Lutetium Lu 177 Vipivotide Tetraxetan, but little is published on outcomes to this approach.
As such, they enrolled patients on an IRB approved managed access protocol. All patients were treated by a single investigator at a single institution. Eligible patients had mCRPC and had received previous treatment with at least one androgen receptor pathway inhibitor and at least one round of taxane based chemotherapy. Baseline imaging, demographics, treatment history, and tumor characteristics were collected. Patients were treated with 7.4 GBq of Lutetium Lu 177 Vipivotide Tetraxetan every 6 weeks for up to six cycles. Adverse events and PSA response were collected.
They enrolled 14 patients with advanced mCRPC between 8/2021 and 8/2022. All patients had advanced mCRPC, were heavily pre-treated, and had failed both hormonal as well as chemotherapeutic options. The average number of androgen receptor pathway inhibitor courses for the cohort is 2.4 (range 1-4) and the average number of taxane courses for the cohort is 1.5 (Range 1-3). 11 patients underwent Piflufolastat F 18 PET and 3 patients had Ga 68 PSMA 11 PET. Baseline PSA varied significantly from 2.51 - 961.71 ng/mL. Declines of 50% in PSA were observed in 8/14 patients. 2 patients had greater than 80% PSA reductions.
PSA response is presented below:
Based on this, the authors concluded that PSA treatment responses were similar to the VISION trial in this cohort of patients selected with either Piflufolastat F 18 PET or Ga 68 PSMA 11 PET, thereby supporting the guideline recommendations.
Presented by: Thomas Pence Boike, MD | GenesisCare
Written by: Thenappan (Thenu) Chandrasekar, MD – Urologic Oncologist, Associate Professor of Urology, University of California, Davis @tchandra_uromd on Twitter during the 2023 Genitourinary (GU) American Society of Clinical Oncology (ASCO) Annual Meeting, San Francisco, Thurs, Feb 16 – Sat, Feb 18, 2023.
- Sartor O, de Bono J, Chi KN, Fizazi K, Herrmann K, Rahbar K, Tagawa ST, Nordquist LT, Vaishampayan N, El-Haddad G, Park CH, Beer TM, Armour A, Pérez-Contreras WJ, DeSilvio M, Kpamegan E, Gericke G, Messmann RA, Morris MJ, Krause BJ; VISION Investigators. Lutetium-177-PSMA-617 for Metastatic Castration-Resistant Prostate Cancer. N Engl J Med. 2021 Sep 16;385(12):1091-1103. doi: 10.1056/NEJMoa2107322. Epub 2021 Jun 23. PMID: 34161051; PMCID: PMC8446332.