Cesium Cs-131

DB19250InvestigationalSmall molecule

Cesium Cs-131 is under investigation in clinical trial NCT04340258 (Trial Combining Pembrolizumab and Cesium 131 Brachytherapy With Salvage Surgery in HNSCC).

Chemical structure of Cesium Cs-131
Formula / weight
Cs · 130.9055 g/mol (avg)
Also known as
Cesium-131 · Cesium, isotope of mass 131 · Cesium131
Code names
131CS · CS 131

Resolves to

Compound
UNIIBKV67W3IO8CAS14914-76-2ChEMBLCHEMBL4297365
Structure
InChIKeyTVFDJXOCXUVLDH-YPZZEJLDSA-NSMILES[131Cs]

What you can answer from here — as of September 14, 2026

1TransporterSubstrate / inhibitor direction, not just membership
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3Clinical trialsPhase, status and sponsor resolved per trial
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1+ReferenceStructured and connected to the statements they support
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Which companies are running trials of Cesium Cs-131, in which indications and phases, and which of those programs are still active?

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