LAG3

Chr 12

lymphocyte activating 3

Also known as: CD223

Lymphocyte-activation protein 3 belongs to Ig superfamily and contains 4 extracellular Ig-like domains. The LAG3 gene contains 8 exons. The sequence data, exon/intron organization, and chromosomal localization all indicate a close relationship of LAG3 to CD4. [provided by RefSeq, Jul 2008]

OMIMResearchGenerating clinical summary…

Clinical highlights

Interpreting a novel variant
This gene is strongly intolerant of loss-of-function variation in the population, so LoF variants warrant close attention. No curated mechanism annotation is available — see the mechanism card for the computational prediction and its caveats.Based on population constraint only.
12
Active trials
377
Pubs (1 yr)
P/LP submissions
P/LP missense
0.50
LOEUF
Multiple*
Mechanism· predicted

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

Moderate LoF intolerance
LoF Constraint?
0.50LOEUF
pLI 0.276
Z-score 3.24
OE 0.24 (0.120.50)
Moderately constrained

More LoF-intolerant than ~75% of genes

Missense Constraint?
0.51Z-score
OE missense 0.91 (0.821.01)
246 obs / 269.7 exp
Tolerant

Mild missense constraint

Observed / Expected Ratios?
LoF OE?0.24 (0.120.50)
00.351.4
Missense OE?0.91 (0.821.01)
00.61.4
Synonymous OE?1.11
01.21.6
LoF obs/exp: 5 / 21.0Missense obs/exp: 246 / 269.7Syn Z: -0.89

ClinVar Variant Classifications

0 submitted variants in ClinVar

Protein Context — Lollipop Plot

LAG3 · protein map & ClinVar variants

Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.

Clinical Trials

Active and recruiting trials from ClinicalTrials.gov

Borderline Resectable/Unresectable Pancreatic CancerNon Metastatic Pancreatic Cancer

Intratumoral MMR Vaccine Injection in Borderline Resectable/Unresectable Pancreatic Cancer

RECRUITING
NCT07539155Phase PHASE1, PHASE2University of ArkansasStarted 2026-06-26
Intratumoral MMR Injection
Multiple Myeloma

A Clinical Study of TQB2029 for Injection in Subjects With Multiple Myeloma

RECRUITING
NCT06700395Phase PHASE1Chia Tai Tianqing Pharmaceutical Group Nanjing Shunxin Pharmaceutical Co., Ltd.Started 2024-11-28
TQB2029 injection
Non-small Cell Lung Cancer

A Trial to Learn How the Combination of Fianlimab With Cemiplimab and Chemotherapy Works Compared With Cemiplimab and Chemotherapy for Treating Adult Patients With Advanced Non-small Cell Lung Cancer

ACTIVE NOT RECRUITING
NCT05800015Phase PHASE2, PHASE3Regeneron PharmaceuticalsStarted 2023-08-08
fianlimabcemiplimabPemetrexed
Biliary Tract CancerColorectal CarcinomaGastric Cancer, Metastatic

CDH17 CAR-T Therapy in Advanced Malignant Solid Tumors

RECRUITING
NCT06937567Phase EARLY_PHASE1Zhejiang UniversityStarted 2024-12-26
CDH17 CAR-TFAST LACO-Stim CDH17 CAR-T
Cutaneous Squamous Cell Carcinoma

Neoadjuvant Nivolumab and Relatlimab in Cutaneous Squamous Cell Carcinoma

RECRUITING
NCT06288191Phase PHASE2Melanoma Institute AustraliaStarted 2024-06-21
Nivolumab 240 mg / Relatlimab 80 mg in a fixed dose combination
Metastatic Melanoma

Markers of Efficacy to Immunotherapy in Patients With Metastatic Melanoma

NOT YET RECRUITING
NCT07794501European Institute of OncologyStarted 2026-08-27
Gastric CancerMSI-HMetastatic Cancer

Combination of Immune Checkpoint in Locally Advanced or Metastatic MSI/dMMR Esogastric Adenocarcinomas

RECRUITING
NCT06346197Phase PHASE3Centre Leon BerardStarted 2025-12-08
BalstilimabBotensilimabFolfox Protocol
Breast Cancer MetastaticBreast Carcinoma

Immun Checkpoint Washout in Patients With Invasive Ductal Breast Cancer

RECRUITING
NCT07003009Phase NAIstanbul Training and Research HospitalStarted 2024-01-01
Malign Lymph Node WashoutBenign Lymph Node Washout
Advanced LymphomaAdvanced Malignant Solid NeoplasmBladder Carcinoma

Targeted Therapy Directed by Genetic Testing in Treating Patients With Advanced Refractory Solid Tumors, Lymphomas, or Multiple Myeloma (The MATCH Screening Trial)

ACTIVE NOT RECRUITING
NCT02465060Phase PHASE2National Cancer Institute (NCI)Started 2015-08-17
AdavosertibAfatinibAfatinib Dimaleate
Gastric AdenocarcinomaGastroesophageal Junction Adenocarcinoma

A Study of Anti-PD-1 and LAG-3 Bispecific Antibody(AK129) Combined With Chemotherapy With or Without Cadonilimab in the First-line Treatment of Unresectable Locally Advanced or Metastatic G/ GEJ Adenocarcinoma

NOT YET RECRUITING
NCT06586294Phase PHASE1, PHASE2AkesoStarted 2024-09-10
Drug: AK129 Drug:oxaliplatin Drug:capecitabineDrug: AK129 Drug:cadonilimab Drug:oxaliplatin Drug:capecitabine
NSCLCLocally Advanced

Thoracic Radiotherapy and Inhibition of PD-1 and LAG-3 for Locally Advanced Non-Small Cell Lung Cancer

RECRUITING
NCT06865339Phase PHASE2Montefiore Medical CenterStarted 2025-08-07
CemiplimabFianlimabRadiotherapy
Breast NeoplasmTriple Negative Breast Cancer (TNBC)HRD

PHOENIX DDR/Anti-PD-L1 Trial: A Pre-surgical Window of Opportunity and Post-surgical Adjuvant Biomarker Study of DNA Damage Response Inhibition With or Without Anti-PD-L1 Immunotherapy in Patients With Neoadjuvant Treatment Resistant Residual Triple Negative Breast Cancer

RECRUITING
NCT03740893Phase PHASE2Institute of Cancer Research, United KingdomStarted 2019-10-15
AZD6738OlaparibDurvalumab