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• W1552204196 abstract "Estrogen receptor (ER) +ve luminal B subtype of breast tumors initially respond well to tamoxifen treatment. However, over longer periods of time, their frequent recurrence contributes to the overall high mortality rate of hormone receptor +ve breast cancer patients. Recently, with the development of PARP inhibitors, there is a potential line of treatment for the triple negative subtype. But a huge dearth exists in therapeutically targeting luminal B tumors since these tumors are also insensitive to chemotherapy. Our current research addresses this urgent need by utilizing a systems biology approach to identify potential therapeutic targets and diagnostic markers for luminal B subtype of breast cancer. The endocytic pathway, as demonstrated by our laboratory is a frequent target of genomic aberrations in cancer, and plays a critical role in maintenance of cellular polarity, stem cell function, bioenergetics, proliferation, motility, invasion, metastasis, apoptosis and autophagy. Derailed endocytosis is therefore a hallmark of cancer. The Rab GTPases along with their effectors are critical regulators of this endocytic machinery and can have a huge impact on the cellular itinerary of growth factor as well as integrin receptor signaling. A broad spectrum analysis of distribution of all the Rab family members across 52 breast cancer cell lines reflected a dichotomous distribution of Rab25, with higher mRNA and protein expression in ER+ cell lines. Rab 25 is of immense interest to us because of its unique substitution of leucine for glutamine at position 71 which typically decreases the intrinsic GTPase activity, resulting in a dominant, constitutively active protein, akin to a transforming RAS mutation. Here we evaluate the role of Rab25 as a valuable predictive and prognostic marker for ER+ breast cancers, with critical implication in disease management and predicting response to therapy. Using high throughput data analysis from publicly available mRNA expression datasets, we report that Rab25 and its effector Rab coupling protein (RCP) are frequently coamplified and coordinately elevated in ER +ve breast cancers. Specifically in the luminal B subtypes, they are significantly associated with a markedly worsened outcome. Compatible with Rab25 and RCP being drivers of the amplicons, their respective mRNA levels are highly correlated across multiple tumor sets, most prominently in luminal B tumors (Soritiou p" @default.
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• W1552204196 date "2010-10-01" @default.
• W1552204196 modified "2023-09-26" @default.
• W1552204196 title "Genomic and proteomic approaches identify Rab25 as a potential prognostic marker for luminal B breast tumors" @default.
• W1552204196 doi "https://doi.org/10.1158/diag-10-a11" @default.
• W1552204196 hasPublicationYear "2010" @default.
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