Forecast horizon — calibration-scored at resolution.
PD-L1 tumor expression status will serve as a clinically validated predictive biomarker to guide selection between nivolumab monotherapy and combination nivolumab plus ipilimumab in metastatic melanoma.
TL;DR · AI-generated
Among previously untreated patients with metastatic melanoma, nivolumab alone or combined with ipilimumab resulted in significantly longer progression-free survival than ipILimumab alone, and in patients with PD-L1-negative tumors, the combination of PD-1 and CTLA-4 blockade was more effective than either agent alone.
Author-implied confidence
58%
Current probability
Status
DRAFT
Your probability this resolves TRUE
0% (impossible)
50%
100% (certain)
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Evidence stream
1 event · 1 snapshot
posterior drift
78% → 78% (0pp · 1 point)
Peer-reviewed paper
Apr 18, 2026
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Source publication
Combined Nivolumab and Ipilimumab or Monotherapy in Untreated Melanoma.
· openalex W2166662937 · s2 f1d33462
Semantically related
Nearest claims in the expert-corpus vector space. Ordered by cosine distance — lower is closer.
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In previously untreated metastatic melanoma patients with PD-L1-positive tumors, nivolumab monotherapy achieves equivalent median progression-free survival (14.0 months) to nivolumab plus ipilimumab combination therapy.
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In previously untreated metastatic melanoma patients with PD-L1-negative tumors, nivolumab plus ipilimumab produces longer progression-free survival (11.2 months) than nivolumab monotherapy (5.3 months).
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The CheckMate-067 trial's stated primary conclusion — Nivolumab + ipilimumab combination yields superior long-term survival in advanced melanoma vs. either monotherapy. — replicates in independent cohorts.
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In previously untreated patients with unresectable stage III/IV melanoma, nivolumab plus ipilimumab achieves a median progression-free survival of 11.5 months versus 2.9 months with ipilimumab alone (HR 0.42, P<0.001).
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Pembrolizumab's PFS and OS benefit over ipilimumab in advanced melanoma will be maintained at longer follow-up beyond the median 7.9-month observation period reported in this trial.
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Pembrolizumab (10 mg/kg every 2 weeks) improves 12-month overall survival to 74.1% versus 58.2% for ipilimumab (HR 0.63, P=0.0005) in patients with advanced melanoma.