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Tambiciclib · SLS-009, GFH009

Small molecule · Inhibitor of CDK9 · developed by Sellas Life Sciences Group

Phase 1/2 Most advanced trial
SLS Developer
1 Registered trials

What is Tambiciclib?

Tambiciclib is a selective CDK9 inhibitor that blocks phosphorylation and kinase activity of CDK9, preventing PTEFb-mediated activation of RNA polymerase II. This inhibits transcription of anti-apoptotic proteins, inducing cell cycle arrest and apoptosis in tumor cells. It is studied in hematologic malignancies including acute myeloid leukemia and chronic B-cell lymphocytic leukemia.

Summary written with AI from the sources listed at the end of this page.

At a glance

Also known as
SLS-009, GFH009
Drug type
Small molecule
Targets
CDK9, RNA polymerase II (POLR2A) (secondary target)
Mechanism
Inhibitor of CDK9
Pathways
transcription inhibition, apoptosis, cell cycle arrest
Therapy area
Oncology
Developer
Sellas Life Sciences Group (SLS)
FDA status
Investigational, not approved in the US. Most advanced trial: Phase 1/2
UNII
XDZ7VK8CXC

🧪 Clinical trials

TrialPhaseConditionStatusSponsor
NCT04588922 Phase 1/2 Hematologic Malignancies Recruiting SLS

Trials of the companies BioRadar tracks, from ClinicalTrials.gov, most advanced phase first.

Conditions studied

Hematologic Malignancies

More from Sellas Life Sciences Group

Sources

Updated Oct 3, 2026. Something wrong or missing? Report it on the SLS page.

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Data: FDA (Drugs@FDA, Purple Book, DailyMed), NIH (NCI Thesaurus, GSRS, RxNorm), ClinicalTrials.gov • Informational purposes only, not medical or investment advice. • All drugs A–Z

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