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• W4239475701 abstract "<sec> <title>BACKGROUND</title> Publicly available genomic and transcriptomic data in searchable databases allow researchers to investigate specific medical issues in thousands of patients. Many studies have highlighted the role lipids play in cancer initiation and progression and reported nutritional interventions aimed at improving prognosis and survival. Therefore, there is an increasing interest in the role that fat intake may play in cancer. It is known that there is a relationship between BMI and survival in patients with cancer, and that there is an association between a high-fat diet and increased cancer risk. In some cancers, such as colorectal cancer, obesity and high fat intake are known to increase the risk of cancer initiation and progression. On the contrary, in patients undergoing treatment for melanoma, a higher BMI unexpectedly acts as a protective factor rather than a risk factor; this phenomenon is known as the obesity paradox. </sec> <sec> <title>OBJECTIVE</title> We aimed to identify the molecular mechanism underlying the obesity paradox, with the expectation that this could indicate new effective strategies to reduce risk factors and improve protective approaches. </sec> <sec> <title>METHODS</title> In order to determine the genes potentially involved in this process, we investigated the expression values of lipid-related genes in patients with melanoma or colorectal cancer. We used available data from 2990 patients from 3 public databases (IST [In Silico Transcriptomics] Online, GEO [Gene Expression Omnibus], and Oncomine) in an analysis that involved 3 consecutive validation steps. Of this group, data from 1410 individuals were analyzed in the IST Online database (208 patients with melanoma and 147 healthy controls, as well as 991 patients with colorectal cancer and 64 healthy controls). In addition, 45 melanoma, 18 nevi, and 7 healthy skin biopsies were analyzed in another database, GEO, to validate the IST Online data. Finally, using the Oncomine database, 318 patients with melanoma (312 controls) and 435 patients with colorectal cancer (445 controls) were analyzed. </sec> <sec> <title>RESULTS</title> In the first and second database investigated (IST Online and GEO, respectively), patients with melanoma consistently showed significantly (<i>P</i>&lt;.001) lower expression levels of 4 genes compared to healthy controls: <i>CD36</i>, <i>MARCO</i>, <i>FABP4</i>, and <i>FABP7</i>. This strong reduction was not observed in patients with colorectal cancer. An additional analysis was carried out on a DNA-TCGA data set from the Oncomine database, further validating <i>CD36</i> and <i>FABP4</i>. </sec> <sec> <title>CONCLUSIONS</title> The observed lower expression of genes such as <i>CD36</i> and <i>FABP4</i> in melanoma may reduce the cellular internalization of fat and therefore make patients with melanoma less sensitive to a high dietary fat intake, explaining in part the obesity paradox observed in patients with melanoma. </sec>" @default.
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• W4239475701 date "2019-11-08" @default.
• W4239475701 modified "2023-09-27" @default.
• W4239475701 title "Expression of Genes Related to Lipid Handling and the Obesity Paradox in Melanoma: Database Analysis (Preprint)" @default.
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• W4239475701 doi "https://doi.org/10.2196/preprints.16974" @default.
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