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NX-5948

Phase 3

B-cell Lymphoma | Small molecule | Oncology |Nurix Therapeutics, Inc.|Last Updated: Jul 2, 2026

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Trial Design
RandomizedCONTROLLEDDMC
Total Trials2
Total Enrollment770
FDA Designations
FAST_TRACK
Clinical trial landscape

NX-5948 · 6 trials · 13 indications

Phase 3 1Phase 2 1Phase 1 4
NCT07516093Study of NX-5948 Versus Pirtobrutinib in R/R CLL/SLLB-cell Lymphoma
NOT YET_RECRUITING620 Analytics
PHASE3NOT YET_RECRUITING
Study of NX-5948 Versus Pirtobrutinib in R/R CLL/SLL
B-cell LymphomaUnlock trial analytics
Study Endpoints
Primary Endpoints
Progression-free survival (PFS) as assessed by Independent Review Committee (IRC)
Up to approximately 3.5 years

Time from randomization to disease progression or death due to any cause, whichever is earlier

Objective response rate without partial response with lymphocytosis (PR-L) as determined by an Independent Review Committee (IRC)
Up to approximately 5 years

The percentage of participants with response as determined according to 2018 International Workshop on CLL (iwCLL) guidelines. Response will include complete response (CR)/CR with incomplete marrow recovery (CRi), partial response (PR), and nodular PR.

Number of participants with treatment-emergent adverse events
Up to approximately 7 years
Assessment of PK parameters: NX-5948 tablets versus capsules
9 weeks

Relative bioavailability of NX-5948 tablet, compared to capsule, will be measured using PK parameters (AUC)

Assessment of PK parameters NX-5948 tablets versus capsules
9 weeks

Relative bioavailability of NX-5948 tablet, compared to capsule, will be measured using PK parameters (Tmax)

Food effect and effect of esomeprazole on AUC0-t for single-dose NX-5948 tablet
9 weeks

Evaluate the effect of food and the effect of multiple doses of esomeprazole on the single-dose PK of NX-5948 tablet

Food effect and effect of esomeprazole on AUC0-inf for single-dose NX-5948 tablet
9 weeks

Evaluate the effect of food and the effect of multiple doses of esomeprazole on the single-dose PK of NX-5948 tablet

Food effect and effect of esomeprazole on Cmax for single-dose NX-5948 tablet
9 weeks

Evaluate the effect of food and the effect of multiple doses of esomeprazole on the single-dose PK of NX-5948 tablet

Characterize Area Under the Curve (AUC0-inf), Half-life (T1/2) after IV dosing of NX-5948
9 weeks

Characterize the Area Under the Curve (AUC0-inf), Half-life (T1/2) of a single IV dose of NX-5948 in healthy adult male subjects.

Evaluation of metabolite after oral dosing with [14C]-NX-5948
9 weeks

Identify major metabolite and its AUC in plasma following a single oral dose of \[14C\]-NX-5948 in healthy adult male subjects.

Assessment of bioavailability with oral dosing of NX-5948
9 weeks

Determine the absolute bioavailability (ABA) of an oral formulation of \[NX-5948C\]- in healthy adult male subjects.

Assessment of total radioactivity after oral dosing with NX-5948
9 weeks

Determine the recovery of total radioactivity (TRA; mass balance) as a percentage of the administered dose after a single oral dose of \[14C\]-NX-5948 in healthy adult male subjects.

Assessment of whole blood to plasma ratio for TRA after oral dosing with NX-5948
9 weeks

Characterize whole blood to plasma ratio for TRA following a single oral dose of \[14C\]-NX-5948 in healthy adult male subjects (i.e., whole blood:plasma partitioning ratio).

Characterize the Clearance (CL) after IV dosing of NX-5948
9 weeks

Character the Clearance (CL) after IV dosing of NX-5948in healthy adults male subjects.

Characterize the Volume of distribution (Vz) after IV dosing of NX-5948
9 weeks

Character the Volume of distribution (Vz) after IV dosing of NX-5948in healthy adults male subjects.

Number of participants with protocol specified dose-limiting toxicities
Up to 24 months

Phase 1a

To establish the maximum tolerated dose and/or recommended Phase 1b dose(s)
Up to 24 months

Phase 1a

To evaluate the anti-tumor activity of NX-5948 in the dose levels selected for Phase 1b safety expansion based on overall response rate (ORR) as assessed by Investigator
Up to 3 years

Phase 1b Part 1

Number of participants with treatment-emergent adverse events (TEAEs); Grade 3, 4, 5 TEAEs, serious adverse events (SAEs), TEAEs leading to study drug discontinuation, deaths due to TEAEs, and all deaths
Up to 6 years

Phase 1a / Phase 1b Part 1

To further evaluate the anti-tumor activity of NX-5948 in patients with CLL/SLL at the dose identified in Phase 1b Part 1 based on overall response rate (ORR) as assessed by Investigator
Up to 3 years

Phase 1b Part 2

Secondary Endpoints
Overall survival
Up to approximately 6 years
PFS as assessed by the investigator
Up to approximately 6 years
Objective response rate (ORR) with and without partial response with lymphocytosis (PR-L) as assessed by IRC and investigator
Up to approximately 6 years
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Arm A: NX-5948EXPERIMENTAL -
Arm B: PirtobrutinibEXPERIMENTAL -
NX-5948EXPERIMENTAL -
NX-5948 + venetoclaxEXPERIMENTAL -
NX-5948 + venetoclax + rituximabEXPERIMENTAL -
NX-5948 + venetoclax + obinutuzumabEXPERIMENTAL -
NX-5948 tablet and capsule under fasted and fed conditionsEXPERIMENTAL -
NX-5948 tablet and capsule combined with esomeprazole under fasted conditionsEXPERIMENTAL -
Active Treatment Arm IV and OralEXPERIMENTALThis single Arm will include a single dose by IV and a single dose given by mouth for all 8 subjects.
Phase 1a Dose EscalationEXPERIMENTALMultiple dose levels of NX-5948 to be evaluated; determination of Maximum Tolerated Dose/Phase 1b recommended dose(s)
Phase 1b Part 1 Cohort 1 in CLL or SLL with prior BTKi and BCL2iEXPERIMENTALCLL or SLL with prior exposure to both a Bruton's tyrosine kinase inhibitor (BTKi) and BCL-2 inhibitor, unless previously deemed ineligible for a BCL-2i. Patients enrolled in CLL/SLL arm will be randomized to one of two dose levels.
Phase 1b Part 1 Cohort 2 in CLL/SLL with non-C481S BTK mutationsEXPERIMENTALPrior exposure to both BTKi and BCL-2i (unless deemed ineligible for BCL-2i by Investigator at the time of study enrollment) and documented BTK mutation other than C481S within 6 months prior to study entry
Phase 1b Part 1 Cohort 3 in CLL/SLL with prior non-covalent BTKiEXPERIMENTALCLL/SLL with prior exposure to ncBTKi and are BCL-2i naïve.
Phase 1b Part 1 Cohort 4 in CLL/SLL with TP53 or 17p deletion, 2L, prior BTKiEXPERIMENTALPatients with documented TP53 mutation or 17p deletion and 1 prior line of therapy that included a BTKi and are BCL-2i naïve.
Phase 1b Part 1 Cohort 5 in CLL/SLL with 2L+, prior BTKiEXPERIMENTALPatients with at least 1 prior line of therapy that included a BTKi and are BCL-2i naïve.
Phase 1b Part 1 Cohort 6 in MCLEXPERIMENTALNon-blastoid MCL with prior exposure to a BTKi and an anti-CD20 monoclonal antibody (mAb)-based chemoimmunotherapy regimen
Phase 1b Part 1 Cohort 7 in MZLEXPERIMENTALMZL (EMZL, MALT, NMZL, SMZL) with prior exposure to an anti-CD20 mAb-based chemo-immunotherapy regimen and an additional line of therapy
Phase 1b Part 1 Cohort 8 in WM (3L+)EXPERIMENTALWM with prior exposure to a BTKi and at least an additional line of therapy
Phase 1b Part 1 Cohort 9 in WM (2L)EXPERIMENTALWM following upfront therapy with a BTKi
Phase 1b Part 1 Cohort 10 in DLBCLEXPERIMENTALDLBCL which transformed from indolent lymphoma or Richters transformation with prior exposure to an anthracycline (unless previously deemed ineligible to receive), an anti-CD20 mAb-based chemoimmunotherapy regimen, and an additional line of therapy
Phase 1b Part 1 Cohort 11 in FLEXPERIMENTALFL (grade 1-3a) with prior exposure to an anti-CD20 mAb-based chemoimmunotherapy regimen and an additional line of therapy
Phase 1b Part 1 Cohort 12 in PCNSL/SCNSLEXPERIMENTALPCNSL following at least 1 prior line of therapy that included a BTKi (2L+) or following 2 or more prior lines of therapy (3L+), or SCNSL patients meeting criteria for a non-CLL/SLL cohort enrolling that disease with secondary CNS involvement of lymphoma
Phase 1b Part 1 Cohort 13 in PCNSLEXPERIMENTALPCNSL following upfront therapy and with no prior exposure to a BTKi (2L).
Phase 1b Part 2 in CLL or SLL with prior BTKi and BCL-2iEXPERIMENTALCLL or SLL with prior exposure to both a Bruton's tyrosine kinase inhibitor (BTKi) and BCL-2 inhibitor
Phase 1b Part 1 Cohort 14 in first-line WMEXPERIMENTALTreatment-naïve WM deemed unfit for chemoimmunotherapy
Phase 1b Part 1 Cohort 15 in BTKi-naive CLL/SLLEXPERIMENTALFirst-line (1L) or second-line+ (2L)+ CLL/SLL with no prior exposure to a BTKi
Phase 1b Part 1 Cohort 16 in CLL/SLL with secondary warm autoimmune hemolytic anemia (wAIHA)EXPERIMENTALBTKi-exposed R/R CLL or SLL with secondary wAIHA
Phase 1b Part 1 Cohort 17 in CLL/SLL with CNS involvementEXPERIMENTALBTKi-exposed R/R CLL or SLL with CNS involvement
Interventions
NameTypeDescription
NX-5948DRUGAdministered orally once daily
PirtobrutinibDRUGAdministered orally once daily per prescribing information
venetoclaxDRUGAdministered orally once daily as a tablet per prescribing information
rituximabDRUGAdministered as an intravenous (IV) infusion per prescribing information
obinutuzumabDRUGAdministered as an IV infusion per prescribing information
EsomeprazoleDRUGAdministered orally in capsule form
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo

Key Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2 * Adequate organ and bone marrow function * Confirmed diagnosis of CLL/SLL that meets iwCLL 2018 criteria for diagnosis and systemic treatment * Received at least one prior line of therapy for CLL/SLL t...

Countries:United StatesFranceItalyPolandUnited KingdomNetherlandsSpainSwitzerland
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Competitive Landscape -Cutaneous T-Cell Lymphoma 3 trials (matched to "B-cell Lymphoma")
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Recent Changes (Last 90 Days)
LOWJul 2, 2026NCT05131022lastUpdatePostDate: changed
LOWJul 2, 2026NCT07221500lastUpdatePostDate: changed
LOWJul 2, 2026NCT05131022lastUpdatePostDate: changed
LOWJul 2, 2026NCT07221500lastUpdatePostDate: changed
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LOWJul 2, 2026NCT07221500lastUpdatePostDate: changed
LOWJun 16, 2026NCT05131022lastUpdatePostDate: changed
LOWJun 16, 2026NCT07221500lastUpdatePostDate: changed
LOWJun 16, 2026NCT05131022lastUpdatePostDate: changed
LOWJun 16, 2026NCT07221500lastUpdatePostDate: changed
LOWJun 16, 2026NCT05131022lastUpdatePostDate: changed
LOWJun 16, 2026NCT07221500lastUpdatePostDate: changed
LOWMay 29, 2026NCT07221500lastUpdatePostDate: changed
LOWMay 29, 2026NCT07221500lastUpdatePostDate: changed
LOWMay 29, 2026NCT07221500lastUpdatePostDate: changed
LOWMay 26, 2026NCT06717269primaryCompletionDate: changed
LOWMay 26, 2026NCT05131022primaryCompletionDate: changed
LOWMay 26, 2026NCT07221500primaryCompletionDate: changed
LOWMay 26, 2026NCT07520006primaryCompletionDate: changed
LOWMay 26, 2026NCT07516093primaryCompletionDate: changed