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- W2892022984 abstract "9507 Background: PD-1 pathway inhibitors have shown significant activity in the treatment of advanced cutaneous melanoma. Their role in UM has not yet been well characterized. UM has molecular, pathogenic and clinical features distinct from cutaneous melanoma, including a low overall mutation burden, rare BRAF V600 and NRAS mutations, and a propensity for liver metastasis. In this series, we further investigate the efficacy and safety of PD-1 blockade in metastatic UM patients (pts). Methods: We analyzed a multicenter retrospective series of stage IV UM pts treated with antibodies against PD-1 (pembrolizumab, nivolumab) or its ligand, PD-L1 (atezolizumab). Tumor responses were evaluated by RECIST v1.1, and adverse events by CTCAE v4.0. Survival intervals were calculated using the Kaplan-Meier method. Demographic and clinical variables associated with tumor response and survival were investigated. Results: We retrospectively identified 58 pts across 9 academic institutions. Fifty-four (93%) pts had ECOG performance status 0 or 1, and 52 (90%) had liver metastases. Seven (12%) were treatment-naïve and 36 (62%) had received prior ipilimumab. Forty (69%) received pembrolizumab, 16 (28%) received nivolumab, and 2 (3%) received atezolizumab. Objective response rate (ORR) was 3% (95% confidence interval [CI] 0-8.4%). Stable disease greater than 6 months was observed in 4 (7%) pts. Median progression-free survival (PFS) was 2.7 months (95% CI 2.4-3.3). Median overall survival (OS) was 9.5 months (95% CI 5.5-15). There was no significant association between improved PFS or OS and age, sex, metastatic site or response to prior ipilimumab. PD-1/PD-L1 blockade was well tolerated; 7 (12%) pts reported grade 3 adverse events (AEs) of colitis, fatigue, nausea, vomiting, hyperbilirubinemia or lymphopenia, and no grade 4 or 5 AEs were reported. No pts discontinued therapy due to toxicity. Conclusions: In this largest series to date of UM pts treated with PD-1/PD-L1 antibodies, treatment was safe but rarely conferred durable responses. Predictive biomarkers and other immune or targeted therapies should be further investigated to improve clinical outcomes." @default.
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- W2892022984 date "2016-05-20" @default.
- W2892022984 modified "2023-10-07" @default.
- W2892022984 title "Efficacy and safety of programmed death receptor-1 (PD-1) blockade in metastatic uveal melanoma (UM)." @default.
- W2892022984 doi "https://doi.org/10.1200/jco.2016.34.15_suppl.9507" @default.
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