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Gene ARID1A
Variant W1670*
Impact List nonsense
Protein Effect loss of function - predicted
Gene Variant Descriptions ARID1A W1670* results in a premature truncation of the Arid1a protein at amino acid 1670 of 2285 (UniProt.org). W1670* has not been characterized, however, due to the effects of other truncation mutations downstream of W1670 (PMID: 29736026), is predicted to lead to a loss of Arid1a protein function.
Associated Drug Resistance

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Transcript NM_006015.5
gDNA chr1:g.26775592G>A
cDNA c.5009G>A
Protein p.W1670*
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_006015 chr1:g.26775592G>A c.5009G>A p.W1670* RefSeq GRCh38/hg38
NM_006015.5 chr1:g.26775592G>A c.5009G>A p.W1670* RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
ARID1A inact mut colorectal adenocarcinoma unknown unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, somatic loss-of-function mutations in the genes of the mSWI/SNF complex, including ARID1A, correlated with improved survival in one cohort of patients with colorectal adenocarcinoma treated with systemic immune checkpoint inhibitors but not the other, with adjusted HRs for overall survival of 0.30 (p=0.03, n=35) and 0.56 (p=0.244, n=63), respectively (PMID: 32321774). 32321774
ARID1A inact mut transitional cell carcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, somatic loss-of-function mutations in the genes of the mSWI/SNF complex, including ARID1A, did not correlate with improved survival in 2 separate cohorts of patients with transitional cell carcinoma treated with systemic immune checkpoint inhibitors, with adjusted HRs for overall survival of 1.44 (p=0.34, n=56) and 0.82 (p=0.559, n=93), respectively (PMID: 32321774). 32321774
ARID1A inact mut prostate cancer predicted - sensitive Olaparib Case Reports/Case Series Actionable In a Phase II (TOPARP-B) trial, Lynparza (olaparib) treatment resulted in a composite overall response rate of 20.0% (4/20) and a RECIST objective response rate of 0% (0/17) in patients with castration-resistant prostate cancer harboring deleterious mutations in DNA damage response genes, including ARID1A, ATRX, CHEK1/2, FANCA, FANCF, FANCG, FANCI, FANCM, MSH2, NBN, RAD50, and WRN (n=1, 1, 1, 5, 5, 2, 1, 1, 2, 1, 1, 1, 7, respectively) (PMID: 31806540; NCT01682772). 31806540
ARID1A inact mut melanoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, somatic loss-of-function mutations in the genes of the mSWI/SNF complex, including ARID1A, did not correlate with improved survival in 2 separate cohorts of patients with melanoma treated with systemic immune checkpoint inhibitors, with adjusted HRs for overall survival of 1.70 (p=0.192, n=86) and 1.02 (p=0.939, n=192), respectively (PMID: 32321774). 32321774
ARID1A inact mut gastroesophageal adenocarcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, somatic loss-of-function mutations in the genes of the mSWI/SNF complex, including ARID1A, did not correlate with improved survival in 2 separate cohorts of patients with gastroesophageal adenocarcinoma treated with systemic immune checkpoint inhibitors, with adjusted HRs for overall survival of 0.70 (p=0.403, n=66) and 0.46 (p=0.071, n=59), respectively (PMID: 32321774). 32321774
ARID1A inact mut head and neck squamous cell carcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, somatic loss-of-function mutations in the genes of the mSWI/SNF complex, including ARID1A, did not correlate with improved survival in 2 separate cohorts of patients with head and neck squamous cell carcinoma treated with systemic immune checkpoint inhibitors, with adjusted HRs for overall survival of 0.74 (p=0.631, n=31) and 0.76 (p=0.622, n=68), respectively (PMID: 32321774). 32321774
ARID1A mutant lung non-small cell carcinoma predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer but not statistically significant median progression-free survival (8.7 vs 4.6 months, p=0.53) in patients with ARID1A-altered (n=7) non-small cell lung cancer than in patients with ARID1A wild-type (n=104) tumors (PMID: 32111729). 32111729
ARID1A mutant gastroesophageal cancer predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer median progression-free survival (11.4 vs 2.5 months, p=0.21) in patients with ARID1A-altered (n=5) gastroesophageal cancer than in patients with ARID1A wild-type (n=16) tumors (PMID: 32111729). 32111729
ARID1A mutant ovarian clear cell carcinoma sensitive VE-821 Preclinical - Cell culture Actionable In a preclinical study, ovarian clear cell carcinoma cells harboring an ARID1A mutation were sensitive to VE-821 in in vitro assays, demonstrating decreased cell survival (PMID: 27958275). 27958275
ARID1A mutant ovarian cancer sensitive UNC1999 Preclinical - Cell culture Actionable In a preclinical study, UNC1999 inhibited growth of ovarian cancer cell lines harboring ARID1A mutations in culture (PMID: 25686104). 25686104
ARID1A mutant Advanced Solid Tumor predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (PFS, 11 vs 4 months, p=0.006) in patients with ARID1A-altered (n=46) tumors than in patients with ARID1A wild-type (n=329) tumors, and improved overall survival (31 vs 20 months, p=0.13), ARID1A alterations predicted longer PFS (HR=0.61, p=0.02) after immune checkpoint inhibitor therapies independent of MSI or TMB status (PMID: 32111729). 32111729
ARID1A mutant lung non-small cell carcinoma predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer but not statistically significant median progression-free survival (8.7 vs 4.6 months, p=0.53) in patients with ARID1A-altered (n=7) non-small cell lung cancer than in patients with ARID1A wild-type (n=104) tumors (PMID: 32111729). 32111729
ARID1A mutant melanoma predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer median progression-free survival (45.4 vs 3.0 months, p=0.08) in patients with ARID1A-altered (n=6) melanoma than in patients with ARID1A wild-type (n=91) tumors (PMID: 32111729). 32111729
ARID1A mutant colorectal cancer predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (5.2 vs 2.1 months, p=0.005) in patients with ARID1A-altered (n=12) colorectal cancer than in patients with ARID1A wild-type (n=37) tumors (PMID: 32111729). 32111729
ARID1A mutant melanoma predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer median progression-free survival (45.4 vs 3.0 months, p=0.08) in patients with ARID1A-altered (n=6) melanoma than in patients with ARID1A wild-type (n=91) tumors (PMID: 32111729). 32111729
ARID1A mutant ovarian clear cell carcinoma sensitive Dasatinib Preclinical - Cell line xenograft Actionable In a preclinical study, Sprycel (dasatinib) resulted in decreased cell growth of ovarian clear cell carcinoma (OCCC) cells harboring an ARID1A mutation in culture and anti-tumor activity in cell line xenograft models of OCCC (PMID: 27364904). 27364904
ARID1A mutant Advanced Solid Tumor predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (PFS, 11 vs 4 months, p=0.006) in patients with ARID1A-altered (n=46) tumors than in patients with ARID1A wild-type (n=329) tumors, and improved overall survival (31 vs 20 months, p=0.13), ARID1A alterations predicted longer PFS (HR=0.61, p=0.02) after immune checkpoint inhibitor therapies independent of MSI or TMB status (PMID: 32111729). 32111729
ARID1A mutant bladder urothelial carcinoma predicted - sensitive Nivolumab Clinical Study - Cohort Actionable In a retrospective analysis, metastatic urothelial carcinoma patients from the CheckMate275 trial harboring an ARID1A mutation (n=39) demonstrated a greater overall survival (11.4 mo vs 6.0 mo; P=0.03) compared to patients with wild-type ARID1A (n=100) when treated with Opdivo (nivolumab) (PMID: 32554706; NCT02387996). 32554706
ARID1A mutant endometrial cancer predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (4.6 vs 3.0 months, p=0.02) in patients with ARID1A-altered (n=10) endometrial cancer than in patients with ARID1A wild-type (n=13) tumors (PMID: 32111729). 32111729
ARID1A mutant endometrial cancer predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (4.6 vs 3.0 months, p=0.02) in patients with ARID1A-altered (n=10) endometrial cancer than in patients with ARID1A wild-type (n=13) tumors (PMID: 32111729). 32111729
ARID1A mutant renal cell carcinoma predicted - sensitive Bevacizumab + Everolimus Phase II Actionable In a Phase II trial, 100% (5/5) of renal cell carcinoma patients harboring ARID1A mutations achieved the primary endpoint of 6 month PFS when treated with the combination therapy Afinitor (everolimus) and Avastin (bevacizumab) (PMID: 27601542). 27601542
ARID1A mutant bladder urothelial carcinoma predicted - sensitive Atezolizumab Clinical Study - Cohort Actionable In a retrospective analysis, metastatic urothelial carcinoma patients from the IMvigor210 trial harboring an ARID1A mutation (n=62) demonstrated a greater overall survival (15.4 mo vs 8.2 mo; P=0.03) compared to patients with wild-type ARID1A (n=213) when treated with Tecentriq (atezolizumab) (PMID: 32554706; NCT02108652). 32554706
ARID1A mutant gastroesophageal cancer predicted - sensitive unspecified PD-1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in longer median progression-free survival (11.4 vs 2.5 months, p=0.21) in patients with ARID1A-altered (n=5) gastroesophageal cancer than in patients with ARID1A wild-type (n=16) tumors (PMID: 32111729). 32111729
ARID1A mutant ovarian clear cell carcinoma sensitive Berzosertib Preclinical - Cell line xenograft Actionable In a preclinical study, Berzosertib (VX-970) treatment in ovarian clear cell carcinoma cells harboring an ARID1A mutation resulted in decreased cell survival and induction of DNA damage and apoptosis in culture, and tumor growth inhibition in cell line xenograft models (PMID: 27958275). 27958275
ARID1A mutant colorectal cancer predicted - sensitive unspecified PD-L1 antibody Clinical Study - Cohort Actionable In a retrospective analysis, anti-PD-1/PD-L1 therapies resulted in significantly longer median progression-free survival (5.2 vs 2.1 months, p=0.005) in patients with ARID1A-altered (n=12) colorectal cancer than in patients with ARID1A wild-type (n=37) tumors (PMID: 32111729). 32111729
ARID1A mutant ovarian cancer sensitive GSK126 Preclinical - Cell line xenograft Actionable In a preclinical study, GSK126 selectively inhibited growth of ARID1A-mutant ovarian cancer cells in culture, and induced tumor regression in ARID1A-mutant ovarian cancer xenograft models (PMID: 25686104). 25686104
Molecular Profile Protein Effect Treatment Approaches
ARID1A W1670* loss of function - predicted EZH2 inhibitor