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Published on: January 12, 2020
SYNE1 Mutation Is Associated with Increased Tumor Mutation Burden and Immune Cell Infiltration in Ovarian Cancer
Laura M Harbin1, Nan Lin2, Frederick R Ueland1
1Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Kentucky Markey Cancer Center, 800 Rose Street, Lexington, KY 20536-0596, USA.
Abstract:
SYNE1, a nuclear envelope protein critical for cellular structure and signaling, is downregulated in numerous malignancies. SYNE1 alterations are found in 10% of gynecologic malignancies and 5% of epithelial ovarian cancers. Previous studies demonstrated an association between SYNE1 mutation, increased tumor mutation burden (TMB), and immunotherapy response. This study evaluates the SYNE1 mutation frequency, association with TMB, and downstream effects of SYNE1 mutation in ovarian cancer. Genetic information, including whole-exome sequencing, RNA analysis, and somatic tumor testing, was obtained for consenting ovarian cancer patients at an academic medical center. Mutation frequencies were compared between the institutional cohort and The Cancer Genome Atlas (TCGA). Bioinformatics analyses were performed. In our cohort of 50 patients, 16 had a SYNE1 mutation, and 15 had recurrent disease. Median TMB for SYNE1 mutated patients was 25 compared to 7 for SYNE1 wild-type patients (p < 0.0001). Compared to the TCGA cohort, our cohort had higher SYNE1 mutation rates (32% vs. 6%, p < 0.001). Gene expression related to immune cell trafficking, inflammatory response, and immune response (z > 2.0) was significantly increased in SYNE1 mutated patients. SYNE1 mutation is associated with increased TMB and immune cell infiltration in ovarian cancer and may serve as an additional biomarker for immunotherapy response.
Insights
SYNE1 mutations are more common in ovarian cancer patients with recurrent disease. These mutations correlate with higher tumor mutation burden and increased immune cell infiltration, suggesting SYNE1 as a potential biomarker for immunotherapy response.
Area of Science:
- Oncology
- Genetics
- Immunology
Background:
- The nuclear envelope protein SYNE1 is downregulated in many cancers, including gynecologic and ovarian cancers.
- Previous research links SYNE1 mutations to increased tumor mutation burden (TMB) and improved immunotherapy outcomes.
Purpose of the Study:
- To investigate SYNE1 mutation frequency in ovarian cancer.
- To assess the association between SYNE1 mutations, TMB, and immune responses.
- To evaluate SYNE1 as a potential biomarker for immunotherapy in ovarian cancer.
Main Methods:
- Genetic analysis including whole-exome sequencing and RNA analysis of ovarian cancer patients.
- Comparison of mutation frequencies between an institutional cohort and The Cancer Genome Atlas (TCGA).
- Bioinformatics analysis to assess TMB and gene expression related to immune response.
Main Results:
- SYNE1 mutations were identified in 32% of the institutional cohort, significantly higher than TCGA (6%).
- SYNE1-mutated patients exhibited a median TMB of 25, compared to 7 in wild-type patients (p < 0.0001).
- Increased gene expression related to immune cell trafficking and inflammatory response was observed in SYNE1-mutated tumors.
Conclusions:
- SYNE1 mutation is significantly associated with increased TMB and immune cell infiltration in ovarian cancer.
- SYNE1 alterations may represent a valuable biomarker for predicting immunotherapy response in ovarian cancer patients.
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