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Biological Markers definition: Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.
biomarker definition: a biological, physiological, behavioral, or molecular indicator of a process, disease, or system; e.g., fish mortality and pollution, behavioral changes and alcoholism, neuroendocrine system changes and aging.
marker definition: A diagnostic indication that disease may develop.
Biomarker definition: A characteristic that is objectively measured and evaluated as an indicator of normal biologic processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention. (From: FDA Guidance for Industry: Pharmacogenomic Data Submissions.)
Biomarker definition: A variation in cellular or biochemical components or processes, structures, or functions that is objectively measurable in a biological system and that characterizes normal biologic processes, pathogenic processes, an organism's state of health or disease, likelihood of developing a disease, prognosis, or response to a particular therapeutic intervention. Biomarkers include but not limited to such phenotypic parameters as specific enzyme or hormone concentration, specific gene phenotype, presence or absence of biological substances.
Tumor Markers, Biological definition: Molecular products metabolized and secreted by neoplastic tissue and characterized biochemically in cells or body fluids. They are indicators of tumor stage and grade as well as useful for monitoring responses to treatment and predicting recurrence. Many chemical groups are represented including hormones, antigens, amino and nucleic acids, enzymes, polyamines, and specific cell membrane proteins and lipids.
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