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Discuss the use of diagnostic, prognostic and predictive markers in cellular pathology. Biological markers are useful chemicals, which can be endogenous or exogenous such as inulin (Prevot A, et al., 2002), and can be proteins, receptors, genes etc. They confirm a diagnosis with different degrees of certainty according to their specificity and sensitivity; simply, they are processes which can be measured (Franz K., 2004). Markers are a response to abnormal cells or dysfunction of organs. They are either released from cells, displayed on cell surfaces, accumulate inside cells, or compounds injected into patients. Three types of markers used in cellular pathology will be discussed below. Diagnostic markers Diagnostic markers are used to confirm signs and symptoms or provide further evidence that a certain illness exists such as distinguishing a certain cancer from another. Diagnostic markers are commonly employed and are lately being discovered rapidly to aid in diagnosis of specific diseases....

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