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Ref Type Journal Article
PMID (32321774)
Authors Abou Alaiwi S, Nassar AH, Xie W, Bakouny Z, Berchuck JE, Braun DA, Baca SC, Nuzzo PV, Flippot R, Mouhieddine TH, Spurr LF, Li YY, Li T, Flaifel A, Steinharter JA, Margolis CA, Vokes NI, Du H, Shukla SA, Cherniack AD, Sonpavde G, Haddad RI, Awad MM, Giannakis M, Hodi FS, Liu XS, Signoretti S, Kadoch C, Freedman ML, Kwiatkowski DJ, Van Allen EM, Choueiri TK
Title Mammalian SWI/SNF Complex Genomic Alterations and Immune Checkpoint Blockade in Solid Tumors.
Journal Cancer immunology research
Vol 8
Issue 8
Date 2020 Aug
URL
Abstract Text Prior data have variably implicated the inactivation of the mammalian SWItch/Sucrose Non-Fermentable (mSWI/SNF) complex with increased tumor sensitivity to immune checkpoint inhibitors (ICI). Herein, we examined the association between mSWI/SNF variants and clinical outcomes to ICIs. We correlated somatic loss-of-function (LOF) variants in a predefined set of mSWI/SNF genes (ARID1A, ARID1B, SMARCA4, SMARCB1, PBRM1, and ARID2) with clinical outcomes in patients with cancer treated with systemic ICIs. We identified 676 patients from Dana-Farber Cancer Institute (DFCI, Boston, MA) and 848 patients from a publicly available database from Memorial Sloan Kettering Cancer Center (MSKCC, New York, NY) who met the inclusion criteria. Multivariable analyses were conducted and adjusted for available baseline factors and tumor mutational burden. Median follow-up was 19.6 (17.6-22.0) months and 28.0 (25.0-29.0) months for the DFCI and MSKCC cohorts, respectively. Seven solid tumor subtypes were examined. In the DFCI cohort, LOF variants of mSWI/SNF did not predict improved overall survival (OS), time-to-treatment failure (TTF), or disease control rate. Only patients with renal cell carcinoma with mSWI/SNF LOF showed significantly improved OS and TTF with adjusted HRs (95% confidence interval) of 0.33 (0.16-0.7) and 0.49 (0.27-0.88), respectively, and this was mostly driven by PRBM1 In the MSKCC cohort, where only OS was captured, LOF mSWI/SNF did not correlate with improved outcomes across any tumor subtype. We did not find a consistent association between mSWI/SNF LOF variants and improved clinical outcomes to ICIs, suggesting that mSWI/SNF variants should not be considered as biomarkers of response to ICIs.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
AXL V421L missense unknown AXL V421L lies within fibronectin type-III domain 2 of the Axl protein (UniProt.org). V421L has been identified in sequencing studies (PMID: 32321774), but has not been biochemically characterized and therefore, its effect on Axl protein function is unknown (PubMed, Jun 2022).
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References