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ALLO-501A

Phase 1

Relapsed or Refractory Large B Cell Lymphoma, Relapsed or Refractory Chronic Lymphocytic Leukemia, Relapsed or Refractory Small Lymphocytic Lymphoma | Gene therapy | Oncology |Allogene Therapeutics, Inc.|Last Updated: Mar 4, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment160
FDA Designations
RMAT
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04416984Safety and Efficacy of ALLO-501A Anti-CD19 Allogeneic CAR T Cells in Adults With Relapsed/Refractory Large B Cell Lymphoma, Chronic Lymphocytic Leukemia and Small Lymphocytic Lymphoma (ALPHA2)PHASE1 ACTIVE NOT_RECRUITING 160May 21, 2020May 1, 2029Mar 4, 202629 United States, Australia +1
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Study Endpoints
Primary Endpoints
Phase 1a: Proportion of subjects experiencing Dose Limiting Toxicities (DLT) at increasing doses of ALLO-501A
28 days

Dose limiting toxicity is defined as protocol-defined ALLO-501A-related adverse events with onset within 28 days following infusion

Phase 1a: Proportion of subjects experiencing Dose Limiting Toxicity with ALLO-647 in combination with fludarabine/cyclophosphamide administered prior to ALLO-501A
33 days

DLT is defined as protocol-defined ALLO-647-related adverse events with onset within 33 days following 1st infusion

Phase 1b: Frequency and severity of ALLO-501A treatment-emergent adverse events (AEs), serious AEs, and AEs of special interest
Up to 60 months
Phase 2: Overall Response Rate (ORR) assessed per Independent Review Committee (IRC)
Up to 60 months

ORR defined as assessment of CR and PR using Lugano classification criteria 2014

Secondary Endpoints
Phase 1a, 1b, and 2: Duration of Response (DOR) assessed per IRC (Phase 2 only) and per investigator
Up to 60 months
Phase 1a, 1b, and 2: Overall Response Rate (ORR) assessed per investigator
Up to 60 months
Phase 1a, 1b, and 2: Best overall response (CR, PR, SD, PD) assessed per IRC (Phase 2 only) and per investigator
Up to 60 months
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ALLO-501A, ALLO-647EXPERIMENTAL -
Interventions
NameTypeDescription
ALLO-501AGENETICALLO-501A is an allogeneic CAR T cell therapy targeting CD19
ALLO-647BIOLOGICALALLO-647 is a monoclonal antibody that recognizes a CD52 antigen
FludarabineDRUGChemotherapy for lymphodepletion
CyclophosphamideDRUGChemotherapy for lymphodepletion
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites29

Inclusion Criteria: For subjects with LBCL: * Histologically confirmed diagnosis of relapsed/refractory large B-cell lymphoma at last relapse per WHO 2017 * At least 1 measurable lesion at time of enrollment * Relapsed or refractory disease after at least 2 lines of chemotherapy * Absence of signi...

Countries:United StatesAustraliaCanada
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT04416984primaryCompletionDate: changed
LOWMay 24, 2026NCT04416984studyFirstPostDate: changed