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Gene IDH2
Variant R140X
Impact List missense
Protein Effect unknown
Gene Variant Descriptions IDH2 R140X indicates any Idh2 missense mutation that results in the replacement of the arginine (R) at amino acid 140 by a different amino acid. R140 variants are hotspot mutations in Idh2, which may confer a gain of function to the Idh2 protein resulting in conversion of alpha-ketoglutarate to the onco-metabolite 2HG (R(-)-2-hydroxyglutarate) (PMID: 23071358, PMID: 27621679).
Associated Drug Resistance
Category Variants Paths

IDH2 mutant IDH2 R140X

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Transcript NM_002168.3
gDNA chr15:g.90088701_90088703
cDNA c.418_420
Protein p.R140
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_002168 chr15:g.90088701_90088703 c.418_420 p.R140 RefSeq GRCh38/hg38
NM_002168.3 chr15:g.90088701_90088703 c.418_420 p.R140 RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
IDH2 R140X myelodysplastic syndrome predicted - sensitive Enasidenib Phase II Actionable In a Phase II trial, Idhifa (enasidenib) treatment was well tolerated and resulted in an overall response rate of 43% (9/21, 5 complete remission (CR), 1 partial remission, 1 marrow CR, 2 hematological improvement only) in patients with higher-risk myelodysplastic syndrome harboring IDH2 R140 or R172 mutations who were refractory to or progressed on hypomethylating agents, with a median overall survival of 21.3 months (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 7010-7010; NCT03383575). detail...
IDH2 R140X myelodysplastic syndrome predicted - sensitive Azacitidine + Enasidenib Phase II Actionable In a Phase II trial, Idhifa (enasidenib) and Vidaza (azacitidine) combination treatment was well tolerated and resulted in an overall response rate of 68% (30/46, 11 complete remission (CR), 3 partial remission, 12 marrow CR, 4 hematological improvement only) in patients with higher-risk myelodysplastic syndrome harboring IDH2 R140 or R172 mutations who were naive to hypomethylating agents, with a median overall survival of 21.3 months (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 7010-7010; NCT03383575). detail...
IDH2 R140X acute myeloid leukemia predicted - sensitive LY3410738 Phase I Actionable In a Phase I trial, LY3410738 demonstrated safety and inhibited D-2-HG in patients with relapsed or refractory IDH-mutant acute myeloid leukemia, resulting in a composite complete remission (CRc) rate of 9% (2/23, 2 CR) in IDH inhibitor-naive patients harbor IDH2 R140 mutations (Cancer Res (2023) 83 (8_Supplement): CT026; NCT04603001). detail...