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• W1974735369 endingPage "e0122149" @default.
• W1974735369 startingPage "e0122149" @default.
• W1974735369 abstract "Several clinical trials in oncology have reported increased mortality or disease progression associated with erythropoiesis-stimulating agents. One hypothesis proposes that erythropoiesis-stimulating agents directly stimulate tumor proliferation and/or survival through cell-surface receptors. To test this hypothesis and examine if human tumors utilize the erythropoietin receptor pathway, the response of tumor cells to human recombinant erythropoietin was investigated in disaggregated tumor cells obtained from 186 patients with colorectal, breast, lung, ovarian, head and neck, and other tumors. A cocktail of well characterized tumor growth factors (EGF, HGF, and IGF-1) were analyzed in parallel as a positive control to determine whether freshly-isolated tumor cells were able to respond to growth factor activation ex vivo. Exposing tumor cells to the growth factor cocktail resulted in stimulation of survival and proliferation pathways as measured by an increase in phosphorylation of the downstream signaling proteins AKT and ERK. In contrast, no activation by human recombinant erythropoietin was observed in isolated tumor cells. Though tumor samples exhibited a broad range of cell-surface expression of EGFR, c-Met, and IGF-1R, no cell-surface erythropoietin receptor was detected in tumor cells from the 186 tumors examined (by flow cytometry or Western blot). Erythropoiesis-stimulating agents did not act directly upon isolated tumor cells to stimulate pathways known to promote proliferation or survival of human tumor cells isolated from primary and metastatic tumor tissues." @default.
• W1974735369 created "2016-06-24" @default.
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• W1974735369 date "2015-03-25" @default.
• W1974735369 modified "2023-09-26" @default.
• W1974735369 title "Functional EpoR Pathway Utilization Is Not Detected in Primary Tumor Cells Isolated from Human Breast, Non-Small Cell Lung, Colorectal, and Ovarian Tumor Tissues" @default.
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• W1974735369 doi "https://doi.org/10.1371/journal.pone.0122149" @default.
• W1974735369 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4373902" @default.
• W1974735369 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25807104" @default.
• W1974735369 hasPublicationYear "2015" @default.
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