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SLS009

Phase 1

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

Target and mechanism

Molecular targetWT1
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment160

FDA Designations

ORPHAN_DRUGFAST_TRACKRARE_PEDIATRIC_DISEASE

Clinical trial landscape

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
LOWJul 8, 2026NCT04588922lastUpdatePostDate: changed
LOWJul 8, 2026NCT04588922lastUpdatePostDate: changed

Frequently asked questions about SLS009

What is SLS009 used for?

SLS009 is an investigational small molecule being developed for the treatment of hematologic malignancies, including high-risk newly diagnosed acute myeloid leukemia (AML). It is currently in Phase 1 clinical development and has not been approved by the FDA.

What does SLS009 target?

SLS009 targets the WT1 protein, a transcription factor involved in hematologic malignancies. By inhibiting WT1, SLS009 aims to disrupt cancer cell growth and survival. This targeted approach is being studied in patients with hematologic malignancies, including AML.

Who makes SLS009?

SLS009 is being developed by SELLAS Life Sciences Group, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol SLS. The company is conducting clinical trials to evaluate the safety and efficacy of SLS009 in patients with hematologic malignancies.

What phase is SLS009 in?

SLS009 is currently in Phase 1 clinical development. It is an investigational drug being studied in a Phase 1 trial (NCT04588922) for hematologic malignancies, including high-risk newly diagnosed AML. The drug has not yet been approved by regulatory authorities.

What clinical trials is SLS009 in?

SLS009 is being evaluated in a Phase 1 clinical trial with the identifier NCT04588922. This study is recruiting patients with hematologic malignancies, including high-risk newly diagnosed AML, and is being conducted in the United States and China. The trial aims to enroll 160 participants.

Is SLS009 the same as GFH009?

Yes, SLS009 was formerly known as GFH009. The drug is being developed by SELLAS Life Sciences Group, Inc. under the name SLS009, and it is the same investigational CDK9 inhibitor studied in clinical trials for hematologic malignancies.