Outcomes for patients with mCRPC and liver metastasis receiving 177-Lu-PSMA-617 treatment.

Medientyp: E-Artikel

Titel: Outcomes for patients with mCRPC and liver metastasis receiving 177-Lu-PSMA-617 treatment

Beteiligte: Muniz, Miguel; Sartor, A. Oliver; Mahmoud, Ahmed M.; Orme, Jacob; Kwon, John Y.; Andrews, Jack R.; Kase, Adam McLain; Mosalem, Osama M; Bryce, Alan Haruo; Riaz, Irbaz Bin; Thorpe, Matthew; Kendi, Ayse T.; Johnson, Geoffrey; Ravi, Praful; Kwon, Eugene D.; Childs, Daniel S

Erschienen: American Society of Clinical Oncology (ASCO), 2024

Sprache: Englisch

DOI: 10.1200/jco.2024.42.4_suppl.175

ISSN: 0732-183X; 1527-7755

Schlagwörter: Cancer Research ; Oncology

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Beschreibung: 175 Background: It is well-known that patients with liver metastases from metastatic castration resistant prostate cancer (mCRPC) have poorer or transient responses to many forms of systemic therapy. Data on outcomes following treatment with Lutetium-177–PSMA-617 is scarce. The VISION trial reports hazard ratios for overall survival in the subgroup of patients with liver metastases without disclosing the absolute duration of survival. Using real-world clinical data, we examine this important subgroup of patients, describing their PSA response rates and survival. Methods: A single institution database was assembled to include all patients receiving 177-Lu-PSMA-617 at Mayo Clinic Rochester, MN, and starting treatment in the interval of March 2022 to March 2023. Baseline clinicopathologic and imaging characteristics were abstracted. Patients were categorized based on the presence or absence of measurable liver metastases on their baseline PSMA PET scan. Best PSA response while on treatment was annotated and reported as percent decline from baseline. Survival was calculated from date of first cycle of 177-Lu-PSMA-617. PSA50 response and overall survival (OS) outcomes for the two groups (liver metastases versus no liver metastases) were compared using Chi square test and Kaplan-Meier method, respectively. Those with available pre-treatment circulating tumor DNA (ctDNA) genomic profiling, performed by Guardant (83 gene panel), were assessed for the presence of pathogenic and likely pathogenic alterations. Findings are summarized using descriptive statistics. Results: The overall cohort consisted of 212 patients, including 29 (14%) with liver metastases on pre-treatment PSMA PET/CT. The median number of cycles received was 4 (range, 1-6) for patients with liver metastases and 6 (range, 1-6) for those without hepatic involvement. The observed PSA50 response trended lower for those with liver metastases (34.5% [10/29] versus 51% [94/183], p= 0.091). At median (IQR) follow-up of 10 (8-12) months, there was a numerical but not statistically significant difference in median OS (11.28 months versus NR, p=0.066). In the exploratory analysis of baseline ctDNA, BRCA2 copy number loss was relatively enriched among patients with liver metastases (4 of 19, 21%) versus patients without liver disease (5.7%, 9/158). Conclusions: Our data suggest that the presence of liver metastases predict poorer outcomes in patients receiving Lutetium-177–PSMA-617 treatment, which is similar to data reported with other forms of systemic therapy for mCRPC. To maximize the anti-tumor activity of radioligand therapy in the liver, combination approaches should be explored.

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