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SLS009

Phase 1

Hematologic Malignancies | Small molecule | Oncology |SELLAS Life Sciences Group, Inc.|Trials Updated: Sep 3, 2026

SLS009 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Oct 2020

SLS009 target and mechanism

Molecular targetWT1
Target classProtein
ModalitySmall molecule

Also known as GFH009

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDBiomarker
Total Trials1
Total Enrollment160

FDA Designations

ORPHAN_DRUGFAST_TRACK

SLS009 clinical trials

SLS009 · 1 trial · 1 indication

Phase 1 1
NCT04588922Study of SLS009 (Formerly GFH009) a Potent Highly Selective CDK9 Inhibitor in Patients With Hematologic Malignancies and High-Risk Newly Diagnosed AMLHematologic Malignancies
RECRUITING160 Analytics
PHASE1RECRUITING
Study of SLS009 (Formerly GFH009) a Potent Highly Selective CDK9 Inhibitor in Patients With Hematologic Malignancies and High-Risk Newly Diagnosed AML
Hematologic MalignanciesUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability: Dose Limiting Toxicities (DLTs)
21 to 28 days

The incidence of DLTs

Safety and Tolerability: adverse events (AEs)
approximately 2 years

The incidence and severity of all AEs

Efficacy: ORR
2 years

Overall response rate is the proportion of patients showing anti-leukemic activity in response to treatment

Secondary Endpoints

PK parameter AUC0-t
approximately 3 months
PK parameter AUC0-∞
approximately 3 months
Efficacy: DOR
2 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group 1. Dose escalation in patients with r/r AMLEXPERIMENTALIn the dose escalation part, the dose levels will be escalated following the Bayesian optimal interval (BOIN) design. China study sites only. (Completed).
Group 2. Dose escalation in patients with r/r CLL/SLL or lymphomaEXPERIMENTALIn the dose escalation part, the dose levels will be escalated following the Bayesian optimal interval (BOIN) design. China and US study sites. (Completed).
Group 3 Cohort 1. 45 mg QW in patients with r/r AMLEXPERIMENTALSLS009 (45 mg QW) in combination with venetoclax and azacitidine in patients with r/r AML who have relapsed on or are refractory to venetoclax-based regimens. US study sites only. (Cohort completed)
Group 3 Cohort 2. 60 mg QW in patients with r/r AML.EXPERIMENTALSLS009 (60 mg QW) in combination with venetoclax and azacitidine in patients with r/r AML who have relapsed on or are refractory to venetoclax-based regimens. US study sites only. (Cohort completed).
Group 3 Cohort 3. 30 mg BIW in patients with r/r AML.EXPERIMENTALSLS009 (30 mg BIW) in combination with venetoclax and azacitidine in patients with r/r AML who have relapsed on or are refractory to venetoclax-based regimens. US study sites only. (Cohort completed).
Group 3 Cohort 4. 30 mg BIW in patients with r/r AML with ASXL1 mutation.EXPERIMENTALSLS009 (30 mg BIW) in combination with venetoclax and azacitidine in patients with r/r AML who have relapsed or are refractory to venetoclax-based regimens and with documented ASXL1 mutation.
Group 3 Cohort 5. 30 mg BIW in pts with r/rAML with other than ASXL1 mutationsEXPERIMENTALSLS009 (30 mg BIW) in combination with venetoclax and azacitidine in patients with r/r AML who have relapsed or are refractory to venetoclax-based regimens and with documented Defining somatic mutations, Cytogenetic abnormalities defining acute myeloid leukemia, myelodysplasia related, other than ASXL1 mutation per WHO 5th Edition classification.
Group 4 (treatment arm): SLS009, venetoclax, azacitidineEXPERIMENTALSLS009 (30 mg BIW) in combination with venetoclax and azacitidine in patients with newly diagnosed AML less likely to benefit from standard venetoclax and azacitidine therapy based on molecular profiling.
Group 4 (control arm): venetoclax and azacitidineACTIVE_COMPARATORVenetoclax and azacitidine in patients with newly diagnosed AML less likely to benefit from standard venetoclax and azacitidine therapy based on molecular profiling.
Group 5 (treatment arm): SLS009, venetoclax, azacitidine (not yet recruiting)EXPERIMENTALSLS009 (30 mg BIW) in combination with venetoclax and azacitidine in patients with newly diagnosed AML. Patients who initiate treatment with venetoclax and azacitidine but demonstrate a confirmed lack of any response after two treatment cycles.
Group 5 (control arm): venetoclax and azacitidine (not yet recruiting)ACTIVE_COMPARATORVenetoclax and azacitidine in patients with newly diagnosed AML. Patients who initiate treatment with venetoclax and azacitidine but demonstrate a confirmed lack of any response after two treatment cycles.

Interventions

NameTypeDescription
SLS009DRUGSolution for injection
venetoclaxDRUGTablets
azacitidineDRUGSolution for injection
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Eligibility Criteria

Age Range12 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites32

Inclusion Criteria For Groups 1, 2, 3, 4 and 5: Patients eligible for inclusion must meet all of the following criteria: 1. Male or female ≥ 18 years. For Group 3 Cohorts 4 and 5 only male or female ≥18 years and pediatric patients 12-18 years and ≥40 kg body mass 2. Written informed consent must...

Countries:United StatesChina
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Recent Changes (Last 90 Days)

LOWSep 3, 2026NCT04588922lastUpdatePostDate: changed
LOWSep 3, 2026NCT04588922lastUpdatePostDate: changed
LOWJul 29, 2026NCT04588922lastUpdatePostDate: changed
LOWJul 29, 2026NCT04588922lastUpdatePostDate: changed

Frequently asked questions about SLS009

What is SLS009 used for?

SLS009 is an investigational small molecule being studied for the treatment of hematologic malignancies, including high-risk newly diagnosed acute myeloid leukemia (AML). It is being developed by SELLAS Life Sciences Group, Inc. and is currently in Phase 1 clinical development.

What does SLS009 target?

SLS009 targets WT1, a protein that is overexpressed in certain hematologic malignancies. By targeting WT1, SLS009 aims to interfere with cancer cell growth and survival. The drug is described as a highly selective CDK9 inhibitor.

Who is developing SLS009?

SLS009 is being developed by SELLAS Life Sciences Group, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol SLS. The company is focused on developing novel therapeutics for cancer indications.

What phase is SLS009 in?

SLS009 is in Phase 1 clinical development. The ongoing trial is a Phase 1 study evaluating the drug in patients with hematologic malignancies and high-risk newly diagnosed AML. It is currently recruiting participants.

What clinical trials is SLS009 in?

SLS009 is being evaluated in a Phase 1 clinical trial, NCT04588922, titled "Study of SLS009 (Formerly GFH009) a Potent Highly Selective CDK9 Inhibitor in Patients With Hematologic Malignancies and High-Risk Newly Diagnosed AML." The trial is recruiting with an estimated enrollment of 160 participants across the United States and China.

Is SLS009 the same as GFH009?

Yes, SLS009 was formerly known as GFH009. The drug is a highly selective CDK9 inhibitor being developed for hematologic malignancies. References to GFH009 in clinical trial listings refer to the same investigational compound now called SLS009.