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GAB2 and GAB3 are expressed in a tumor stage-, grade- and histotype-dependent manner and are associated with shorter progression-free survival in ovarian cancer

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Journal of Cell Communication and Signaling Aims and scope

Abstract

Ovarian cancer is the most lethal gynecological malignancy and molecular mechanisms of its progression and metastasis are not completely understood. Some members of GAB (GRB2-associated binding) protein family have been reported to be involved in tumor cell proliferation and metastasis in various cancer types. In the present study, we analyzed the expression of GAB proteins (GAB1, GAB2 and GAB3) in ovarian cancer compared to normal ovarian tissue, in terms of tumor stage, tumor grade and histological type. Differential expression analyses performed in R programming environment using multiple transcriptome datasets (n = 1449) showed that GAB1 expression is decreased in ovarian cancer independently of tumor stage, grade and histotype. Unlike GAB1, expression of GAB2 and GAB3 are increased from early stage to late stage and from low grade to high grade in epithelial ovarian cancer. GAB2 and GAB3 also showed histotype-dependent expression. GAB3 was computed as a top gene whose expression most significantly changed between tumor cells from primary tumor, metastases and ascites. High expression of GAB2 and GAB3 was shown to be associated with shorter progression-free survival in ovarian cancer. This study shows that GAB2 and GAB3 can be important regulators of tumor progression and metastasis in ovarian cancer.

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Availability of data and material (data transparency)

Transcriptomics datasets used in the present study are available from Gene Expression Omnibus (GEO) and TCGA-OV (The Cancer Genome Atlas – Ovarian Cancer), and their accession IDs were given in the text. Most expression data can be accessed in R programming environment using curatedOvarianData Bioconductor data package. Protein datasets used in the study and information on how to access them were given in Materials and Methods section.

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Funding

Caglar Berkel is funded by TUBITAK (The Scientific and Technological Research Council of Turkey) 2211-E graduate program.

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Correspondence to Caglar Berkel.

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R code written to analyze and visualize the data used in this study was provided as a supplementary file to make this study completely reproducible and replicable by other researchers.

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Berkel, C., Cacan, E. GAB2 and GAB3 are expressed in a tumor stage-, grade- and histotype-dependent manner and are associated with shorter progression-free survival in ovarian cancer. J. Cell Commun. Signal. 15, 57–70 (2021). https://doi.org/10.1007/s12079-020-00582-3

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  • DOI: https://doi.org/10.1007/s12079-020-00582-3

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